Iron-Doped Nickel Molybdate with Enhanced Oxygen Evolution Kinetics.

Author(s) Chen, J.; Zhao, G.; Chen, Y.; Rui, K.; Mao, H.; Dou, S.Xue; Sun, W.
Journal Chemistry
Date Published 2019 Jan 02

Electrochemical water splitting is one of the potential approaches for making renewable energy production and storage viable. The oxygen evolution reaction (OER), as a sluggish four-electron electrochemical reaction, has to overcome high overpotential to accomplish overall water splitting. Therefore, developing low-cost and highly active OER catalysts is the key for achieving efficient and economical water electrolysis. In this work, Fe-doped NiMoO was synthesized and evaluated as the OER catalyst in alkaline medium. Fe doping helps to regulate the electronic structure of Ni centers in NiMoO , which consequently promotes the catalytic activity of NiMoO . The overpotential to reach a current density of 10 mA cm is 299 mV in 1 m KOH for the optimal Ni Fe MoO , which is 65 mV lower than that for NiMoO . Further, the catalyst also shows exceptional performance stability during a 2 h chronopotentiometry testing. Moreover, the real catalytically active center of Ni Fe MoO is also unraveled based on the ex situ characterizations. These results provide new alternatives for precious-metal-free catalysts for alkaline OER and also expand the Fe-doping-induced synergistic effect towards performance enhancement to new catalyst systems.

DOI 10.1002/chem.201803844
ISSN 1521-3765
Citation Chemistry. 2019;25(1):280284.

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