Bifunctional nanoparticles decorated Ni1-xMnxCo2O4 ultrathin nanoflakes-like electrodes for supercapacitor and overall water splitting
Corresponding Author
Surendra K. Shinde
Department of Biological and Environmental Science, College of Life Science and Biotechnology, Dongguk University-Seoul, Goyang-si, Gyeonggi-do, South Korea
Correspondence
Surendra K. Shinde and Dae-Young Kim, Department of Biological and Environmental Science, College of Life Science and Biotechnology, Dongguk University-Seoul, Biomedical Campus, 32 Dongguk-ro, Ilsandong-gu, Siksa-dong, Goyang-si, Gyeonggi-do 10326, South Korea.
Email: [email protected] and [email protected]
Search for more papers by this authorSwapnil S. Karade
Department of Green Technology, University of Southern Denmark, Odense M, Denmark
Search for more papers by this authorNagesh C. Maile
Department of Environmental Engineering, Kyungpook National University, Daegu, South Korea
Search for more papers by this authorHemraj M. Yadav
Department of Biological and Environmental Science, College of Life Science and Biotechnology, Dongguk University-Seoul, Goyang-si, Gyeonggi-do, South Korea
School of Nanoscience and Biotechnology, Shivaji University, Kolhapur, Maharashtra, India
Search for more papers by this authorAjay D. Jagadale
Center for Energy Storage and Conversion, School of Electrical & Electronics Engineering, SASTRA Deemed University, Thanjavur, India
Search for more papers by this authorMonali B. Jalak
Department of Physics, Shivaji University, Kolhapur, India
Search for more papers by this authorCorresponding Author
Dae-Young Kim
Department of Biological and Environmental Science, College of Life Science and Biotechnology, Dongguk University-Seoul, Goyang-si, Gyeonggi-do, South Korea
Correspondence
Surendra K. Shinde and Dae-Young Kim, Department of Biological and Environmental Science, College of Life Science and Biotechnology, Dongguk University-Seoul, Biomedical Campus, 32 Dongguk-ro, Ilsandong-gu, Siksa-dong, Goyang-si, Gyeonggi-do 10326, South Korea.
Email: [email protected] and [email protected]
Search for more papers by this authorCorresponding Author
Surendra K. Shinde
Department of Biological and Environmental Science, College of Life Science and Biotechnology, Dongguk University-Seoul, Goyang-si, Gyeonggi-do, South Korea
Correspondence
Surendra K. Shinde and Dae-Young Kim, Department of Biological and Environmental Science, College of Life Science and Biotechnology, Dongguk University-Seoul, Biomedical Campus, 32 Dongguk-ro, Ilsandong-gu, Siksa-dong, Goyang-si, Gyeonggi-do 10326, South Korea.
Email: [email protected] and [email protected]
Search for more papers by this authorSwapnil S. Karade
Department of Green Technology, University of Southern Denmark, Odense M, Denmark
Search for more papers by this authorNagesh C. Maile
Department of Environmental Engineering, Kyungpook National University, Daegu, South Korea
Search for more papers by this authorHemraj M. Yadav
Department of Biological and Environmental Science, College of Life Science and Biotechnology, Dongguk University-Seoul, Goyang-si, Gyeonggi-do, South Korea
School of Nanoscience and Biotechnology, Shivaji University, Kolhapur, Maharashtra, India
Search for more papers by this authorAjay D. Jagadale
Center for Energy Storage and Conversion, School of Electrical & Electronics Engineering, SASTRA Deemed University, Thanjavur, India
Search for more papers by this authorMonali B. Jalak
Department of Physics, Shivaji University, Kolhapur, India
Search for more papers by this authorCorresponding Author
Dae-Young Kim
Department of Biological and Environmental Science, College of Life Science and Biotechnology, Dongguk University-Seoul, Goyang-si, Gyeonggi-do, South Korea
Correspondence
Surendra K. Shinde and Dae-Young Kim, Department of Biological and Environmental Science, College of Life Science and Biotechnology, Dongguk University-Seoul, Biomedical Campus, 32 Dongguk-ro, Ilsandong-gu, Siksa-dong, Goyang-si, Gyeonggi-do 10326, South Korea.
Email: [email protected] and [email protected]
Search for more papers by this authorFunding information: Department of Science & Technology; Dongguk University, Seoul, and Korea Research Fund
Summary
Synthesizing triple transition metal oxide (TTMO) is an extraordinary strategy to develop electrodes for efficient energy storage and conversion devices, owing to their unique nanostructure with high porosity and specific surface area. The cobalt-based mixed-valence oxides have attracted great attention due to their facile synthesis, low cost, and excellent electrochemical performance. However, less attention is paid to investigating the effect of different substitutions on the physico-chemical properties of TTMO. In this study, nanoparticles (NPs) decorated ultrathin Ni1-xMnxCo2O4 nanoflakes (NPs@NFs) are synthesized by tuning the molar ratio between Mn and Ni via facile deep eutectic solvents (DESs) method. Unique and highly porous NPs@NFs nanostructures aid to increase the overall surface area of the materials, whereas Mn, Ni, and Co ions participate in their redox-active capacity, improving the electrochemical activity of the material. This Ni0.8Mn0.2Co2O4 hybrid nanostructure exhibited excellent supercapacitive performance with a high specific capacity (Cs) of 761 mAh g−1 at a higher current density of 30 mA cm−2 and superior cycling retention of 92.86% after 10 000 cycles. Further, a hybrid asymmetric supercapacitor (Ni0.8Mn0.2Co2O4//AC) device exhibited an extended potential window of 1.5 V, which results in an ultrahigh energy density of 66.2 W kg−1 by sustaining a power density of 1519 Wh kg−1. The electrocatalytic activity of the optimized Ni0.8Mn0.2Co2O4 shows the outstanding performance toward hydrogen evolution reaction (HER) (150 mV/ 161 mV dec−1) and oxygen evolution reaction (OER) (123 mV/47 mV dec−1) with a lower voltage of 1.51 V (@10 mA cm−2) for overall water splitting, with outstanding stability up to 25 hours. These results indicate that chemically synthesized ultrathin NPs@NFs-like nanostructure is a capable electrode for multiple applications, such as supercapacitors, and overall water splitting.
Highlights
- Facial synthesis of nanoflakes of Ni1-XMnXCo2O4 thin films by a DES method.
- Fully decorated NPs on the interconnected NFs provided a higher surface area.
- Nanostructures with a maximum specific capacity of 761 mAh g−1 at 30 mA cm−2, with excellent stability of 92.86%.
- The solid-state device shows an excellent energy density of 66.2 Wh kg−1 at a power density of 1519 W kg−1.
- The assembled Ni0.8Mn0.2Co2O4 /Ni-based water splitting exhibited low voltage (1.51 V) and superb stability up to 25 hours.
Supporting Information
| Filename | Description |
|---|---|
| er8333-sup-0001-supinfo.docxWord 2007 document , 3.7 MB | Appendix S1 Supporting Information |
Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
REFERENCES
- 1Kamat PV. Lithium-Ion batteries and beyond: celebrating the Nobel prize in chemistry-a virtual issue. ACS Energy Lett. 2019; 4: 2757-2759.
- 2Lukatskaya MR, Dunn B, Gogosti Y. Multidimensional materials and device architectures for future hybrid energy storage. Nat Commun. 2016; 7: 12647.
- 3Dubal DP, Chodankar NR, Kim DH, Gomez- Romero P. Towards flexible solid-state supercapacitors for smart and wearable electronics. Chem Soc Rev. 2018; 47: 2065-2129.
- 4Chen GZ. Understanding supercapacitors based on nano-hybrid materials with interfacial conjugation. Prog Nat Sci-Mater. 2013; 23: 245-255.
- 5Zhi M, Xiang C, Li J, Li M, Wu N. Nanostructured carbon-metal oxide composite electrodes for supercapacitors: a review. Nanoscale. 2013; 5: 72-88.
- 6Lokhande CD, Dubal DP, Joo O-S. Metal oxide thin film based supercapacitors. Curr Appl Phys. 2011; 11: 255-270.
- 7Lee W, Mane RS, Todkar VV, et al. Implication of liquid-phase deposited amorphous RuO2 electrode for electrochemical supercapacitors. Solid State Lett. 2007; 10: 225.
- 8Liu E-H, Meng X-Y, Ding R, Zhou J-C, Tan S-T. Potentiodynamical co-deposited manganese oxide/carbon composite for high capacitance electrochemical capacitors. Mater Lett. 2007; 61: 3486-3489.
- 9Gund GS, Dubal DP, Shinde SS, Lokhande CD. Architectured morphologies of chemically prepared NiO/MWCNTs Nanohybrid thin films for high-performance supercapacitors. ACS Appl Mater Interfaces. 2014; 6: 3176-3188.
- 10Sankapal BR, Gajare HB, Karade SS, Dubal DP. Anchoring cobalt oxide nanoparticles on to the surface multiwalled carbon nanotubes for improved supercapacitive performances. RSC Adv. 2015; 5: 48426-48432.
- 11Shelke AR, Lokhande AC, Pujari RB, Lokhande CD. Modification in supercapacitive behavior of CoO-rGO composite thin film from exposure to ferri/ferrocyanide redox-active couple. J Colloid Interf Sci. 2018; 522: 111-119.
- 12Tajik S, Dubal DP, Gomez-Romero P, et al. Nanostructured mixed transition metal oxides for high performance asymmetric supercapacitors: facile synthetic strategy. Int J Hydrogen Energ. 2017; 42: 12384-12395.
- 13Pettong T, Iamprasertkun P, Krittayavathananon A, et al. High-performance asymmetric supercapacitors of MnCo2O4 nanofibers and N-doped reduced graphene oxide aerogel. ACS Appl Mater Interf. 2016; 8: 34045-34053.
- 14Dubal DP, Gomez-Romero P, Sankapal BR, Holze R. Nickel cobaltite as an emerging material for supercapacitors: An overview. Nano Energy. 2015; 11: 377-399.
- 15Raut SS, Sankapal BR. Porous zinc cobaltite (ZnCo2O4) film by successive ionic layer adsorption and reaction towards solid-state symmetric supercapacitive device. J Colloid Interface Sci. 2017; 487: 201-208.
- 16Karade SS, Lalwani S, Eum J-H, Kim H. Deep eutectic solvent-assisted synthesis of RuCo2O4: an efficient positive electrode for hybrid supercapacitors. Sustainable Energ Fuel. 2020; 4: 3066-3076.
- 17Dubal DP, Chodankar NR, Holze R, Kim DH, Gomez-Romero P. Ultrathin mesoporous RuCo2O4 Nanoflakes: An advanced electrode for high-performance asymmetric supercapacitors. ChemSusChem. 2017; 10: 1771-1782.
- 18Zhang Q, Vigier KDO, Royer S, Jerome F. Deep eutectic solvents: syntheses, properties and applications. Chem Soc Rev. 2012; 41: 7108-7146.
- 19Tamboli MS, Dubal DP, Patil SS, et al. Mimics of microstructures of Ni substituted Mn1−xNixCo2O4 for high energy density asymmetric capacitors. Chem Eng J. 2017; 307: 300-310.
- 20Jagadale AD, Rohit RC, Shinde SK, Kim D–Y. Materials development in hybrid zinc-ion capacitors. ChemNanoMat. 2021; 7: 1082-1098.
- 21Shinde SK, Karade SS, Yadav HM, et al. Deep eutectic solvent mediated nanostructured copper oxide as a positive electrode material for hybrid supercapacitor device. J Mol Liq. 2021; 341: 117319.
- 22Shinde SK, Ghodake GS, Maile NC, et al. Designing of nanoflakes anchored nanotubes-like MnCo2S4/halloysite composites for advanced battery like supercapacitor application. Electrochim Acta. 2020; 341: 135973.
- 23Shinde SK, Jalak MB, Ghodake GS, et al. Chemically synthesized nanoflakes-like NiCo2S4 electrodes for high-performance supercapacitor application. Appl Surf Sci. 2019; 466: 822-829.
- 24Shinde SK, Dubal DP, Ghodake GS, Fulari VJ. Hierarchical 3D-flower-like CuO nanostructure on copper foil for supercapacitors. RSC Adv. 2015; 5: 4443-4447.
- 25Shinde SK, Dubal DP, Ghodake GS, Kim DY, Fulari VJ. Nanoflower-like CuO/cu(OH)2 hybrid thin films: synthesis and electrochemical supercapacitive properties. J Electroanal Chem. 2014; 732: 80-85.
- 26Shinde S, Dhaygude H, Kim D-Y, et al. Improved synthesis of copper oxide nanosheets and its application in development of supercapacitor and antimicrobial agents. J Ind Eng Chem. 2016; 36: 116-120.
- 27Shinde SK, Kim D-Y, Ghodake GS, et al. Morphological enhancement to CuO nanostructures by electron beam irradiation for biocompatibility and electrochemical performance. Ultrason Sonochem. 2018; 40: 314-322.
- 28Yadav HM, Ghodake GS, Kim D-Y, Sivalingam Ramesh NC, Maile DS, Lee SK. Shinde, Nanorods to hexagonal nanosheets of CuO-doped manganese oxide nanostructures for higher electrochemical supercapacitor performance. Colloid Surface B. 2019; 184: 110500.
- 29Shinde SK, Yadav HM, Sivalingam R, et al. High-performance symmetric supercapacitor; nanoflower-like NiCo2O4//NiCo2O4 thin films synthesized by simple and highly stable chemical method. J Mol Liq. 2020; 299: 112119.
- 30Kandula S, Raj Shrestha K, Rajeshkhanna G, Kim NH, Lee JH. Kirkendall growth and Ostwald ripening induced hierarchical morphology of Ni−co LDH/MMoSx (M = co, Ni, and Zn) Heteronanostructures as advanced electrode materials for asymmetric solid-state supercapacitors. ACS Appl Mater Interfaces. 2019; 11: 11555-11567.
- 31Zhao J, Chen J, Xu S, et al. Hierarchical NiMn layered double hydroxide/carbon nanotubes architecture with superb energy density for flexible supercapacitors. Adv Funct Mater. 2014; 24: 2938-2946.
- 32Wang Y, Liu Y, Wang H, et al. Ultrathin NiCo-MOF Nanosheets for high-performance supercapacitor electrodes. ACS Appl Energy Mater. 2019; 2: 2063-2207.
- 33Huang B, Wang W, Pu T, et al. Two-dimensional porous (co, Ni)-based monometallic hydroxides and bimetallic layered double hydroxides thin sheets with honeycomb-like nanostructure as positive electrode for high-performance hybrid supercapacitors. J Coll Interf Sci. 2018; 532: 630-640.
- 34Padmanathan N, Selladurai S. Controlled growth of spinel NiCo2O4 nanostructures on carbon cloth as a superior electrode for supercapacitors. RSC Adv. 2014; 4: 8341-8349.
- 35Maile NC, Moztahida M, Ghani AA, et al. Electrochemical synthesis of binder-free interconnected nanosheets of Mn-doped Co3O4 on Ni foam for high-performance electrochemical energy storage application. Chem Eng J. 2021; 421:129767.
- 36Xiao Y, Wei W, Zhang M, Jiao S, Shi Y, Ding S. Facile surface properties engineering of high-quality graphene: toward advanced Ni-MOF Heterostructures for high-performance, supercapacitor electrode. ACS Appl Energy Mater. 2019; 2: 2169-2177.
- 37Sahoo S, Naik KK, Rout CS. Electrodeposition of spinel MnCo2O4 nanosheets for supercapacitor applications. Nanotechnology. 2015; 26: 455401-455409.
- 38Wan H, Liu J, Ruan Y, et al. Hierarchical configuration of NiCo2S4 nanotube@Ni-Mn layered double hydroxide arrays/three-dimensional graphene sponge as electrode materials for high-capacitance supercapacitors. ACS Appl Mater Interfaces. 2015; 7: 15840-15847.
- 39Yin C, Yang C, Jiang M, et al. A novel and facile one-pot Solvothermal synthesis of PEDOT−PSS/Ni−Mn−co−O hybrid as an advanced supercapacitor electrode material. ACS Appl Mater Interfaces. 2016; 8: 2741-2275.
- 40Mai LQ, Dong F, Xu X, et al. Cucumber-like V2O5/poly(3,4-ethyl-enedioxythiophene) & MnO2 nanowires with enhanced electrochemical Cyclability. Nano Lett. 2013; 13: 740-745.
- 41Liu X, Shi C, Zhai C, Cheng M, Liu Q, Wang G. Cobalt based layered metal-organic framework as an ultrahigh capacity supercapacitor electrode material. ACS Appl Mater Interfaces. 2016; 8: 4585-4591.
- 42Li S, Huang W, Yang Y, et al. Hierarchical layer-by- layer porous FeCo2S4@Ni(OH)2 arrays for all-solid-state asymmetric supercapacitors. J Mater Chem A. 2016; 6: 20480-20490.
- 43Liu W, Niu H, Yang J, et al. Ternary transition metal sulfides embedded in graphene nanosheets as both the anode and cathode for high-performance asymmetric supercapacitors. Chem Mater. 2018; 30: 1055-1068.
- 44Zhao Y, Hu L, Zhao S, Wu L. Preparation of MnCo2O4@Ni(OH)2 Core–Shell flowers for asymmetric supercapacitor materials with ultrahigh specific capacitance. Adv Funct Mater. 2016; 26: 4085-4093.
- 45Chen WQ, Wang J, Ma KY, et al. Hierarchical NiCo2O4@co-Fe LDH core-shell nanowire arrays for high-performance supercapacitor. Appl Surf Sci. 2018; 451: 280-288.
- 46Lee H-M, CVV MG, Singh-Rana PJ, et al. Hierarchical nanostructured MnCo2O4-NiCo2O4 composite as an innovative electrode for supercapacitor applications. New J Chem. 2018; 42: 17190-17194.
- 47Chen H, Liu A, Mu J, Wu C, Zhang X. Template-free synthesis of novel flower-like MnCo2O4 hollow microspheres for application in supercapacitors. Cer Int. 2016; 42: 2416-2424.
- 48Cai N, Fu J, Chan V, et al. MnCo2O4@nitrogen-doped carbon nanofiber composites with meso-microporous structure for high-performance symmetric supercapacitors. J Alloys Comps. 2019; 782: 251-262.
- 49Wang J, Sun M, Wang F, et al. Essential role of the interfacial interaction in the core-shell electrode for its enhanced electrochemical performance. Chem Eng J. 2021; 426:130895.
- 50Ma D, Wang Y, Han X, Xu S, Wang J. Applicable tolerance evaluations of ion doped carbon nanotube/polypyrrole electrode under adverse solution conditions for capacitive deionization process. Separ Purif Technol. 2018; 201: 167-178.
- 51Chen X, He M, Zhou Y, et al. Design of hierarchical double-layer NiCo/NiMn-layered double hydroxide nanosheet arrays on Ni foam as electrodes for supercapacitors. Mater Today Chem. 2021; 21:100507.
- 52Chu W, Shi Z, Hou Y, et al. Trifunctional of phosphorus-doped NiCo2O4 nanowire materials for asymmetric supercapacitor, oxygen evolution reaction, and hydrogen evolution reaction. ACS Appl Mater Interfaces. 2020; 12: 2763-2772.
- 53Mohite SV, Xing R, Li B, et al. Spatial compartmentalization of cobalt phosphide in P-doped dual carbon shells for efficient alkaline overall water splitting. Inorg Chem. 2020; 59: 1996-2004.
- 54Wang T, Cao Y, Huimin W, Chuanqi Feng Y, Ding HM. N-doped M/CoO (M=Ni, co, and Mn) hybrid grown on nickel foam as efficient electrocatalyst for the chemical-assisted water electrolysis. Int J Hydrogen Energ. 2022; 47: 5766-5778.
- 55Lan B, Xiang Y, Luo X, et al. Charge regulation engineering to suppress Jahn-teller distortion in low crystallinity in-doping MnCo2O4 for high activity pseudocapacitors and hydrogen evolution reaction. Chem Eng J. 2022; 430:132886.
- 56Rohit RC, Jagadale AD, Lee J, Lee K, Shinde SK, Kim D-Y. Tailoring the composition of ternary layered double hydroxides for supercapacitors and electrocatalysis. Energ Fuel. 2021; 35: 9660-9668.
- 57Gunjakar JL, Hou B, Inamdar AI, et al. Two-dimensional layered hydroxide nanoporous nanohybrids pillared with zero-dimensional polyoxovanadate nanoclusters for enhanced water oxidation catalysis. Small. 2018; 14: 1703481.
- 58Sivakumara P, Subramanian P, Maiyalagan T, Gedanken A. Ternary nickelsingle bondcobaltsingle bondmanganese spinel oxide nanoparticles as heterogeneous electrocatalysts for oxygen evolution and oxygen reduction reaction. Mat Chem Phy. 2019; 229: 190-196.
- 59Rohit RC, Jagadale AD, Shinde SK, Kim D-Y, Kumbhar VS, Nakayama M. Hierarchical nanosheets of ternary CoNiFe layered double hydroxide for supercapacitors and oxygen evolution reaction. J Alloy Compd, 863. 2021; 863: 158081.
- 60Deokate RJ, Mujawar SH, Chavan HS, et al. Chalcogenide nanocomposite electrodes grown by chemical etching of Ni-foam as electrocatalyst for efficient oxygen evolution reaction. Int J Energ Res. 2019; 44: 1233-1243.
- 61Liu Z, Tan H, Liu D, et al. Promotion of overall water splitting activity over a wide ph range by interfacial electrical effects of metallic niconitrides nanoparticle/NiCo2O4 nanoflake/graphite fibers. Adv Sci. 2019; 6: 1801829.
- 62Zhou J-J, Kai XH, Li TQ, Li Y-L, Chen C, Han L. Shish-kebab type MnCo2O4@Co3O4 nanoneedle arrays derived from MnCoLDH@ZIF-67 for high-performance supercapacitors and efficient oxygen evolution reaction. Chem Eng J. 2018; 354: 875-884.
- 63Tahir M, Pan L, Zhang R, et al. High-valence-state NiO/Co3O4 nanoparticles on nitrogen-doped carbon for oxygen evolution at low overpotential. ACS Energy Lett. 2017; 2: 2177-2182.
- 64Liu Z, Tan H, Liu D, et al. Promotion of overall water splitting activity over a wide pH range by interfacial electrical effects of metallic NiCo nitrides nanoparticle/NiCo2O4 Nanoflake/graphite fibers. Adv Sci. 2019; 6: 1801829.
- 65Li Y, Zhao C. Enhancing water oxidation catalysis on a synergistic phosphorylated Nife hydroxide by adjusting catalyst wettability. ACS Catal. 2017; 7: 2535-2541.
- 66Santos HLS, Corradini PG, Medina M, Dias JA, Mascaro LH. NiMo−NiCu inexpensive composite with high activity for hydrogen evolution reaction, ACS Appl. Mater. Interfaces. 2020; 12: 17492-17501.
- 67Sun QQ, Dong YJ, Wang ZL, Yin SW, Zhao C. Synergistic Nanotubular copper-doped nickel catalysts for hydrogen evolution reactions. Small. 2018; 14: 1704137.
- 68Mahala C, Basu M. Nanosheets of NiCo2O4/NiO as efficient and stable Electrocatalyst for oxygen evolution reaction. ACS Omega. 2017; 2: 7559-7567.
- 69Benson J, Li M, Wang S, Wang P, Papakonstantinou P. Electrocatalytic hydrogen evolution reaction on edges of a few-layer molybdenum disulfide Nanodots. ACS Appl Mater Interfaces. 2015; 7: 14113-14122.
- 70McCrory CCL, Jung S, Peters JC, Jaramillo TF. Benchmarking heterogeneous Electrocatalysts for the oxygen evolution reaction. J Am Chem Soc. 2013; 135: 16977-16987.
- 71Huang J, Wang S, Nie J, et al. Active site and intermediate modulation of 3D CoSe2 nanosheet array on Ni foam by Mo doping for high-efficiency overall water splitting in alkaline media. Chem Eng J. 2021; 417:128055.
- 72Chen H, Qiao S, Yang J, Xiwen D. NiMo/ NiCo2O4 as synergy catalyst supported on nickel foam for efficient overall water splitting. Mol Catalysis. 2022; 518:112086.
- 73He B, Pan G, Deng Y, et al. Hierarchical iron-phosphide@ NiCo2O4 nanoneedle arrays for high-performance water splitting. Appl Surf Sci. 2021; 569:151016.
- 74Yang R, Shi X, Wang Y, et al. Ruthenium-modified porous NiCo2O4 nanosheets boost overall water splitting in alkaline solution. Chinese Chem Lett. 2021. doi:10.1016/j.cclet.2021.12.058
10.1016/j.cclet.2021.12.058 Google Scholar
- 75Du X, Zhang C, Wang H, Wang Y, Zhang X. Controlled synthesis of Co9S8@ NiCo2O4 nanorod arrays as binder-free electrodes for water splitting with impressive performance. J of Alloy Compd. 2021; 885:160972.
- 76Tao B, Yang L, Miao F, Zang Y, Chu PK. An MoS2/NiCo2O4 composite supported on Ni foam as a bifunctional electrocatalyst for efficient overall water splitting. J Phys Chem Solid. 2021; 150:109842.
- 77Zhang L, Peng J, Zhang W, Yuan Y, Peng K. Rational introduction of borate and phosphate ions on NiCo2O4 surface for high-efficiency overall water splitting. J Power Sources. 2021; 490:229541.
- 78Wang Q, Wang H, Cheng X, et al. NiCo2O4@Ni2P nanorods grown on nickel nanorod arrays as a bifunctional catalyst for efficient overall water splitting. Mater Today Energ. 2020; 17:100490.
- 79Du X, Shao Q, Zhang X. Metal tungstate dominated NiCo2O4 @NiWO4 nanorods arrays as an efficient electrocatalyst for water splitting. Int. J. Hydrogen Energ. 2019; 44(5): 2883-2888.
- 80Debata S, Patr S, Banerjee S, Madhuri R, Sharm PK. Controlled hydrothermal synthesis of graphene supported NiCo2O4 coral-like nanostructures: An efficient electrocatalyst for overall water splitting. Appl Surf Sci. 2018; 449: 203-212.
- 81Deng J, Zhang H, Zhang Y, Luo P, Liu L, Wang Y. Striking hierarchical urchin-like peapoded NiCo2O4@C as an advanced bifunctional electrocatalyst for overall water splitting. J Power Sources. 2017; 372(31): 46-53.
- 82Fang L, Jiang Z, Xu H, Liu L, Yongxinguan XG, Wang Y. Crystal-plane engineering of NiCo2O4 electrocatalysts towards efficient overall water splitting. J Catal. 2018; 357: 238-246.
- 83Cui D, Zhao R, Dai J, Xiang J, Wu F. A hybrid NiCo2O4@NiMoO4 structure for overall water splitting and excellent hybrid energy storage. Dalton Trans. 2020; 49: 9668-9679.
- 84Lin JH, Yan YT, Qu TXXCQ, et al. S doped NiCo2O4 nanosheet arrays by Ar plasma: An efficient and bifunctional electrode for overall water splitting. J Coll Interf Sci. 2020; 560: 34-39.
- 85Cheng L, Zhang R, Lv W, Shao L, Wang Z, Wang W. Surface Phosphation of 3D NiCo2O4 nanowires grown on Ni foam as an efficient bifunctional catalyst for water splitting. Nano. 2020; 15: 2050024.
