Journal
NATURE COMMUNICATIONS
Volume 11, Issue 1, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41467-020-18064-w
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Funding
- Singapore Ministry of Education Academic Research Fund (AcRF) Tier 1 [RG115/17, RG115/18]
- Singapore Energy Center (SgEC) [SgEC-Core2019-15]
- Jiangsu Specially-Appointed Professor program
- National Natural Science Foundation of China [21433005, 21590792, 91645203, 21521091]
- Singapore Ministry of Education Academic Research Fund (AcRF) Tier 2 [MOE2016-T2-2004]
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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 10mA cm(-2) with only 300, 190 and 220mV 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.
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