期刊
SMALL METHODS
卷 3, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smtd.201800324
关键词
ammonia synthesis; chromium oxynitride; electrochemistry; nitrogen reduction
资金
- Development and Reform Commission of Shenzhen Municipality [1106]
- Shenzhen Peacock Plan [KQTD2016022620054656]
- Research Grant Council of the Hong Kong Special Administrative Region [26206115, 16304117]
- Guangdong Special Fund for Science and Technology Development-Hong Kong Technology Cooperation Funding Scheme [201604030012, 201704030019, 201704030065]
The electrochemical synthesis of ammonia via nitrogen reduction reaction (NRR) has received much attention as a more environmentally friendly and less energy consuming technology than the conventional Haber-Bosch process. The catalytic activities of all NRR electrocatalysts reported so far, however, are very low under ambient conditions. In this study, partially oxidized chromium nitride (chromium oxynitride) nanoparticles are synthesized and their NRR activities are evaluated in a proton exchange membrane electrolyzer under ambient conditions. The highest ammonia formation rate of 8.9 x 10(-11) mol s(-1) cm(-2) and 15.56 mu g h(-1) mg(cat-1) are achieved at a cell voltage of 2.0 V. The highest Faradaic efficiency of 6.7% is achieved at a cell voltage of 1.8 V. The findings demonstrate that metal nitride-based materials can be promising electrocatalysts toward NRR and could guide rational design of more advanced catalysts for various reactions.
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