Citation: Gen Zhang, Ying Gu, Lin Li, Fuli Ma, Dan Yue, Xiaoguang Zhou, Chungui Tian. Anion-modulated HER and OER activity of 1D Co-Mo based interstitial compound heterojunctions for the effective overall water splitting[J]. Chinese Chemical Letters, ;2025, 36(7): 110110. doi: 10.1016/j.cclet.2024.110110 shu

Anion-modulated HER and OER activity of 1D Co-Mo based interstitial compound heterojunctions for the effective overall water splitting

Gen Zhang ^a ,
Ying Gu ^{a, *,} ,
Lin Li ^a ,
Fuli Ma ^a ,
Dan Yue ^a ,
Xiaoguang Zhou ^{a, *,} ,
Chungui Tian ^{b, *,}

a.
College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin 150040, China
b.
Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People’s Republic of China, Heilongjiang University, Harbin 150080, China

guying@nefu.edu.cn

zhouxg@nefu.edu.cn

tianchungui@hlju.edu.cn

Received Date: 6 May 2024
Revised Date: 3 June 2024
Accepted Date: 11 June 2024
Available Online: 12 June 2024

Figures(6)

The development of highly active and easily coupled non-noble metal electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is of great significance for the H₂ production by water electrolysis. Here, we have shown an anion-modulated HER and OER activity of 1D Co-Mo based interstitial compound heterojunctions for effective overall water splitting. The Co-Mo based complex nanowires from a one-pot route with high yields can be converted into MoC–Co heterojunction nanowires under N₂ atmosphere, while a pyrolysis under NH₃ can give CoMoN–CoN heterostructures. The work function revealed Mott-Schottky effect between interfaces of two heterostructures, which can introduce electron redistribution and thus promote the HER/OER process. The MoC–Co heterojunction nanowires delivers good HER activity at a low overpotential of 39 mV to afford a current density of 10 mA/cm². Density functional theory calculations show that the heterogeneous interface formed between the Co and MoC optimizes the hydrogen adsorption free energy. Concurrently, CoMoN–CoN heterojunction nanowires exhibits good OER performance with a low overpotential of 260 mV to reach 10 mA/cm², being superior to RuO₂. The two catalysts can be coupled to assemble a two-electrode cell with a solar-to-hydrogen efficiency of 12.3% at 1.54 V. This work provides an effective means to design easily coupled HER and OER catalysts for H₂ production by water electrolysis.
- Anion-modulated,
- Hydrogen evolution reaction,
- Oxygen evolution reaction,
- Transition metal interstitial compounds,
- Overall water splitting
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