Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 24, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202002731
Keywords
2D materials; black phosphorus; nitrogen reduction reaction; photoelectrochemical catalysis; synthesis of ammonia
Categories
Funding
- National Natural Science Foundation of China [51702352, 21975280]
- Youth Innovation Promotion Association Chinese Academy of Sciences [2020354]
- Key Research Program of Frontier Sciences, CAS [QYZDB-SSW-SLH034]
- Natural Science Foundation of Guangdong Province [2020A1515010380]
- Guangdong Special Support Program [2017TX04C096]
- Leading Talents of Guangdong Province Program [00201520]
- City University of Hong Kong Strategic Research Grant SRG [7005105]
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Efficient production of ammonia using environmentally friendly techniques under ambient conditions is crucial to renewable energy storage and industrial applications, and catalysts with new reaction pathways are highly desirable. In this work, black phosphorus (BP) is used as a metal-free 2D catalyst for the photoelectrochemical (PEC) nitrogen reduction reaction (NRR). The electrode is fabricated by layer-by-layer assembly of BP nanosheets on an indium tin oxide substrate. The PEC NRR activity in the N-2 saturated aqueous electrolyte without a sacrificial agent is excellent, as exemplified by an ammonia yield rate of 102.4 mu g h(-1) mgcat.(-1) and Faradaic efficiency of 23.3% at -0.4 V, which are the best among nonmetal catalysts for synthesis of ammonia by photocatalysis and electrocatalysis. Furthermore, the BP electrode shows excellent stability after 6 consecutive cycles. The excellent PEC catalytic properties are attributed to the light excitation enhanced electrocatalytic process and that the external bias promoted photocatalytic process improves ammonia production synergistically. The results not only demonstrate the great potential of BP in PEC catalysis, but also identify a promising technique to produce ammonia under ambient conditions using solar energy and electric energy.
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