期刊
SMALL METHODS
卷 4, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smtd.201900796
关键词
alkaline hydrogen evolution; dual active sites; (Fe, Ni)(OH)(2); ruthenium; superhydrophilicity
资金
- NSFC Major International (Regional) Joint Research Project NSFC-SNSF [51661135023]
- NSFC [21673091]
- China Scholarship Council [201806160035]
- Alexander von Humboldt Foundation
Electrocatalytic water splitting for industrial hydrogen production at large current densities requests highly active and cost-effective catalysts with long-term stability. Here, conductive nickel foam is proposed to be used as a substrate to support (Fe,Ni)(OH)(2) nanosheet arrays and a reducing agent to reduce Ru3+ ions to metallic Ru. The formed 3D self-supported Ru/(Fe,Ni)(OH)(2)/NF (denoted as RFNOH) with a superhydrophilic surface and high conductivity ensures rapid release of gases and efficient electron transportation and mass transfer at a high current density. The resultant RFNOH requires an overpotential of only 152 mV to achieve a current density of 1 A cm(-2) for hydrogen evolution reaction in 1 m KOH solution, along with excellent stability at high current density. Meanwhile, density functional theory calculations suggest that (Fe,Ni)(OH)(2) promotes the dissociation of water molecules considerably, which plays a critical role in enhancing the generation of molecular hydrogen on Ru nanoparticles. Furthermore, the proposed dual-active site mechanism solves the problem of low water-dissociation efficiency faced by noble metal-based catalysts under alkaline media. This study provides a new route for the practical production of large quantities of hydrogen via electrochemical water splitting.
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