期刊
ADVANCED MATERIALS
卷 31, 期 23, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201901174
关键词
heterojunctions; metal interstitial compounds; nitrides; overall water splitting; phosphides
类别
资金
- National Key R&D Program of China [2018YFB1502401]
- National Natural Science Foundation of China [21631004, 21805073, 21571054, 21771059]
- Natural Science Foundation of Heilongjiang Province [QC2018013]
- University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province [UNPYSCT-2017123]
- Basic Research Fund of Heilongjiang University in Heilongjiang Province [RCYJTD201801]
- Heilongjiang University Excellent Youth Foundation
Overall water splitting driven by a low voltage is crucial for practical H-2 evolution, but it is challenging. Herein, anion-modulation of 3D Ni-V-based transition metal interstitial compound (TMIC) heterojunctions supported on nickel foam (Ni3N-VN/NF and Ni2P-VP2/NF) as coupled hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) catalysts for efficient overall water splitting is demonstrated. The heterointerface in Ni3N-VN has a suitable H* absorption energy, being favorable for enhancing HER activity with onset overpotential (eta(onset)) of zero and Tafel slope of 37 mV dec(-1) in 1 m KOH (close to that of Pt/C/NF). For the OER, the synergy of Ni2P-VP2 with oxide species can give enhanced activity with eta(onset) of 220 mV and Tafel slope of 49 mV dec(-1). The good activity is ascribed to heterointerface for activating the intermediates, good conductivity of TMICs for electron-transfer, and porous structure facilitation of mass-transport. Additionally, the minimal mutual influence of Ni3N-VN/NF and Ni2P-VP2/NF allows easy coupling for efficient overall water splitting with a low driving voltage (>= 1.43 V), a voltage of 1.51 V at 10 mA cm(-2), and remarkable durability for 100 h. It can be driven by a solar cell (1.5 V), indicating its potential to store intermittent energy.
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