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Coordination engineering of iridium nanocluster bifunctional electrocatalyst for highly efficient and pH-universal overall water splitting

Author

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  • Qilun Wang

    (Nanyang Technological University)

  • Cong-Qiao Xu

    (Southern University of Science and Technology)

  • Wei Liu

    (Chinese Academy of Sciences)

  • Sung-Fu Hung

    (National Taiwan University)

  • Hong Yang

    (Suzhou University of Science and Technology)

  • Jiajian Gao

    (Nanyang Technological University)

  • Weizheng Cai

    (Nanyang Technological University)

  • Hao Ming Chen

    (National Taiwan University)

  • Jun Li

    (Southern University of Science and Technology
    Tsinghua University)

  • Bin Liu

    (Nanyang Technological University)

Abstract

Water electrolysis offers a promising energy conversion and storage technology for mitigating the global energy and environmental crisis, but there still lack highly efficient and pH-universal electrocatalysts to boost the sluggish kinetics for both cathodic hydrogen evolution reaction (HER) and anodic oxygen evolution reaction (OER). Herein, we report uniformly dispersed iridium nanoclusters embedded on nitrogen and sulfur co-doped graphene as an efficient and robust electrocatalyst for both HER and OER at all pH conditions, reaching a current density of 10 mA cm−2 with only 300, 190 and 220 mV overpotential for overall water splitting in neutral, acidic and alkaline electrolyte, respectively. Based on probing experiments, operando X-ray absorption spectroscopy and theoretical calculations, we attribute the high catalytic activities to the optimum bindings to hydrogen (for HER) and oxygenated intermediate species (for OER) derived from the tunable and favorable electronic state of the iridium sites coordinated with both nitrogen and sulfur.

Suggested Citation

  • Qilun Wang & Cong-Qiao Xu & Wei Liu & Sung-Fu Hung & Hong Yang & Jiajian Gao & Weizheng Cai & Hao Ming Chen & Jun Li & Bin Liu, 2020. "Coordination engineering of iridium nanocluster bifunctional electrocatalyst for highly efficient and pH-universal overall water splitting," Nature Communications, Nature, vol. 11(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-18064-w
    DOI: 10.1038/s41467-020-18064-w
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    Cited by:

    1. Yinghao Li & Chun-Kuo Peng & Huimin Hu & San-Yuan Chen & Jin-Ho Choi & Yan-Gu Lin & Jong-Min Lee, 2022. "Interstitial boron-triggered electron-deficient Os aerogels for enhanced pH-universal hydrogen evolution," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    2. Chun-Kuo Peng & Yu-Chang Lin & Chao‐Lung Chiang & Zhengxin Qian & Yu-Cheng Huang & Chung-Li Dong & Jian‐Feng Li & Chien-Te Chen & Zhiwei Hu & San-Yuan Chen & Yan-Gu Lin, 2023. "Zhang-Rice singlets state formed by two-step oxidation for triggering water oxidation under operando conditions," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    3. Xiaowen Chen & Xuetao Qin & Yueyue Jiao & Mi Peng & Jiangyong Diao & Pengju Ren & Chengyu Li & Dequan Xiao & Xiaodong Wen & Zheng Jiang & Ning Wang & Xiangbin Cai & Hongyang Liu & Ding Ma, 2023. "Structure-dependence and metal-dependence on atomically dispersed Ir catalysts for efficient n-butane dehydrogenation," Nature Communications, Nature, vol. 14(1), pages 1-11, December.

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