Volume 46, Issue 3 pp. 3145-3154
RESEARCH ARTICLE

(Fe, Ni, Co)9S8@CS catalyst decorated on N-doped carbon as an efficient electrocatalyst for oxygen evolution reaction

Youngkwang Kim

Youngkwang Kim

School of Chemical and Biological Engineering, Seoul National University, Seoul, Republic of Korea

Department of Energy and Chemical Engineering, Incheon National University, Incheon, Republic of Korea

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Mohanraju Karuppannan

Mohanraju Karuppannan

Department of Energy and Chemical Engineering, Incheon National University, Incheon, Republic of Korea

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Dohyeon Lee

Dohyeon Lee

Department of Energy and Chemical Engineering, Incheon National University, Incheon, Republic of Korea

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Hyo Eun Bae

Hyo Eun Bae

Department of Energy and Chemical Engineering, Incheon National University, Incheon, Republic of Korea

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Quang Thien Luong

Quang Thien Luong

Department of Energy and Chemical Engineering, Incheon National University, Incheon, Republic of Korea

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Sun Young Kang

Sun Young Kang

School of Chemical and Biological Engineering, Seoul National University, Seoul, Republic of Korea

Centre for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, Republic of Korea

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Yung-Eun Sung

Yung-Eun Sung

School of Chemical and Biological Engineering, Seoul National University, Seoul, Republic of Korea

Centre for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, Republic of Korea

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Yong-Hun Cho

Corresponding Author

Yong-Hun Cho

Department of Chemical Engineering, Kangwon National University, Samcheok, Republic of Korea

Correspondence

Oh Joong Kwon, Department of Energy and Chemical Engineering, Incheon National University, Incheon, 22012, Republic of Korea.

Email: [email protected]

Yong-Hun Cho, Department of Chemical Engineering, Kangwon National University, Samcheok, 25913, Republic of Korea.

Email: [email protected]

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Oh Joong Kwon

Corresponding Author

Oh Joong Kwon

Department of Energy and Chemical Engineering, Incheon National University, Incheon, Republic of Korea

Correspondence

Oh Joong Kwon, Department of Energy and Chemical Engineering, Incheon National University, Incheon, 22012, Republic of Korea.

Email: [email protected]

Yong-Hun Cho, Department of Chemical Engineering, Kangwon National University, Samcheok, 25913, Republic of Korea.

Email: [email protected]

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First published: 10 October 2021
Citations: 12

Youngkwang Kim and Mohanraju Karuppannan contributed equally to this study.

Funding information: Incheon National University, Grant/Award Number: Research Concentration Professors 2019; Korea Research Council for Industrial Science and Technology, Grant/Award Number: KS2022-20

Summary

Fe, Ni, and Co and their alloys are widely studied for oxygen evolution reaction and hydrogen evolution in electrocatalytic water splitting under alkaline conditions, and their pentlandite sulfide was found to enhance the catalytic activity for the reactions. In this study, the synthesis of pentlandite sulfide of Fe, Ni, and Co was tried by a ball milling and subsequent pyrolysis. It was proved that the ball milling method is a promising way for a pentlandite formation and simultaneous carbon encapsulation. An aniline monomer played a role of carbon source for carbon encapsulation, and ammonium persulfate provided sulfur for a sulfide formation. Three kinds of compounds were synthesized by varying the Ni/Co ratio, and their structural characteristics and electrochemical activity were investigated and compared each other. X-ray diffraction patterns showed that they consisted of pentlandite sulfide and metal alloy phase. Transmission electron microscopy revealed that nanoparticles enwrapped by carbon shell were uniformly distributed on N-doped carbon. Electrochemical activity was studied under alkaline condition, and the overpotential of 260 mV at 10 mA/cm2 was obtained in 1 M KOH solution for oxygen evolution reaction. After 500 cycles, the overpotential increased slightly to 310 mV. From this study, it was revealed that the electrochemical activity of (Fe, Ni, Co)9S8 depends on structural parameters not elemental composition.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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