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Amorphous cobalt boride exploring as the first first-row transition-metal-based metallic photocatalyst for efficient water splitting over 800 nm

Author

Listed:
  • Tang, Junying
  • Zhao, Tianshuo
  • He, Yulian
  • Guo, Ruitang
  • Pan, Weiguo
  • Zhang, Hua
  • Dou, Binlin

Abstract

Semiconductors often have limited photocatalytic water-splitting performances owing to the narrow light absorption and low effective carrier density. In response to these challenges, we report the discovery of metallic amorphous cobalt boride (Co2B) as the first first-row transition metallic photocatalyst. It was prepared via a simple chemical reduction method and performs efficient water splitting spanning the UV, visible light and near-infrared region (NIR) via interband transitions. It achieves bifunctional water splitting activities with H2 evolution rate of 202.3 μmol h−1 g−1 and O2 evolution rate of 74.8 μmol h−1 g−1, superior to the existing (semi-)metallic photocatalysts. The material shows over 1 % apparent quantum efficiency (AQE) and 20 % incident photon to current conversion efficiencies (IPCE) at the NIR region >800 nm. Theoretical and photophysical experimental studies synergistically confirm that the metallic nature with high carrier concentrations and amorphous structure with abundant active sites contribute to the good water splitting performance of Co2B. This research sets the foundation for the utilization of highly efficient transition metal-based metallic photocatalysts in photocatalysis across the entire solar spectrum.

Suggested Citation

  • Tang, Junying & Zhao, Tianshuo & He, Yulian & Guo, Ruitang & Pan, Weiguo & Zhang, Hua & Dou, Binlin, 2024. "Amorphous cobalt boride exploring as the first first-row transition-metal-based metallic photocatalyst for efficient water splitting over 800 nm," Renewable Energy, Elsevier, vol. 222(C).
  • Handle: RePEc:eee:renene:v:222:y:2024:i:c:s0960148123018311
    DOI: 10.1016/j.renene.2023.119916
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    References listed on IDEAS

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    1. Peng Zhou & Ishtiaque Ahmed Navid & Yongjin Ma & Yixin Xiao & Ping Wang & Zhengwei Ye & Baowen Zhou & Kai Sun & Zetian Mi, 2023. "Solar-to-hydrogen efficiency of more than 9% in photocatalytic water splitting," Nature, Nature, vol. 613(7942), pages 66-70, January.
    2. Peng, Jiaru & Han, Yue & Ma, Dingxuan & Zhao, Ruiyang & Han, Jishu & Wang, Lei, 2023. "Hollow Cd0.9In0.1Se/Cu2MoS4 nanocube S-scheme heterojunction towards high photocatalytic hydrogen production," Renewable Energy, Elsevier, vol. 212(C), pages 984-993.
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    4. Guo, Feng & Chen, Zhihao & Shi, Yuxing & Cao, Longwen & Cheng, Xiaofang & Shi, Weilong & Chen, Lizhuang & Lin, Xue, 2022. "A ragged porous hollow tubular carbon nitride towards boosting visible-light photocatalytic hydrogen production in water and seawater," Renewable Energy, Elsevier, vol. 188(C), pages 1-10.
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