Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 12, Issue 12, Pages 3522-3529Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ee01743g
Keywords
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Funding
- Ministry of Science and Technology of China [2017YFA0204800]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Collaborative Innovation Center of Suzhou Nano Science and Technology
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Ni-Based materials are promising candidates for the electrocatalytic hydrogen oxidation reaction and hydrogen evolution reaction in alkaline solution. However, pure Ni binds hydrogen very strongly. To promote its electrocatalytic activity would require the weakening of its hydrogen binding energy. Here, we demonstrate that interstitial nitrogen doping in Ni3N can greatly promote its electrocatalytic activity. Ni3N nanoparticles are prepared from the controlled nitridation of Ni-based coordination polymer nanosheets. The resultant product exhibits excellent mass activity superior to most existing nonprecious-metal-based materials and great CO-tolerance for the hydrogen oxidation reaction, as well as remarkable activity and stability for the hydrogen evolution reaction. Our experimental results are further understood and supported by theoretical simulations showing that the interstitial nitrogen doping significantly decreases the hydrogen binding energy and lowers the activation barrier for water formation and dissociation.
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