A Titanium-Doped SiOx Passivation Layer for Greatly Enhanced Performance of a Hematite-Based Photoelectrochemical System
Dr. Hyo-Jin Ahn
Center for Multidimensional Carbon Materials, Institute for Basic Science IBS, Ulsan, 44919 Republic of Korea
School of Energy & Chemical Engineering, Low Dimensional Carbon Materials Center, UNIST, Ulsan, 44919 Republic of Korea
Search for more papers by this authorKi-Yong Yoon
Center for Multidimensional Carbon Materials, Institute for Basic Science IBS, Ulsan, 44919 Republic of Korea
School of Energy & Chemical Engineering, Low Dimensional Carbon Materials Center, UNIST, Ulsan, 44919 Republic of Korea
Search for more papers by this authorMyung-Jun Kwak
Center for Multidimensional Carbon Materials, Institute for Basic Science IBS, Ulsan, 44919 Republic of Korea
School of Energy & Chemical Engineering, Low Dimensional Carbon Materials Center, UNIST, Ulsan, 44919 Republic of Korea
Search for more papers by this authorCorresponding Author
Prof. Ji-Hyun Jang
Center for Multidimensional Carbon Materials, Institute for Basic Science IBS, Ulsan, 44919 Republic of Korea
School of Energy & Chemical Engineering, Low Dimensional Carbon Materials Center, UNIST, Ulsan, 44919 Republic of Korea
Search for more papers by this authorDr. Hyo-Jin Ahn
Center for Multidimensional Carbon Materials, Institute for Basic Science IBS, Ulsan, 44919 Republic of Korea
School of Energy & Chemical Engineering, Low Dimensional Carbon Materials Center, UNIST, Ulsan, 44919 Republic of Korea
Search for more papers by this authorKi-Yong Yoon
Center for Multidimensional Carbon Materials, Institute for Basic Science IBS, Ulsan, 44919 Republic of Korea
School of Energy & Chemical Engineering, Low Dimensional Carbon Materials Center, UNIST, Ulsan, 44919 Republic of Korea
Search for more papers by this authorMyung-Jun Kwak
Center for Multidimensional Carbon Materials, Institute for Basic Science IBS, Ulsan, 44919 Republic of Korea
School of Energy & Chemical Engineering, Low Dimensional Carbon Materials Center, UNIST, Ulsan, 44919 Republic of Korea
Search for more papers by this authorCorresponding Author
Prof. Ji-Hyun Jang
Center for Multidimensional Carbon Materials, Institute for Basic Science IBS, Ulsan, 44919 Republic of Korea
School of Energy & Chemical Engineering, Low Dimensional Carbon Materials Center, UNIST, Ulsan, 44919 Republic of Korea
Search for more papers by this authorAbstract
This study introduces an in situ fabrication of nanoporous hematite with a Ti-doped SiOx passivation layer for a high-performance water-splitting system. The nanoporous hematite with a Ti-doped SiOx layer (Ti-(SiOx/np-Fe2O3)) has a photocurrent density of 2.44 mA cm−2 at 1.23 VRHE and 3.70 mA cm−2 at 1.50 VRHE. When a cobalt phosphate co-catalyst was applied to Ti-(SiOx/np-Fe2O3), the photocurrent density reached 3.19 mA cm−2 at 1.23 VRHE with stability, which shows great potential of the use of the Ti-doped SiOx layer with a synergistic effect of decreased charge recombination, the increased number of active sites, and the reduced hole-diffusion pathway from the hematite to the electrolyte.
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