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Issue 33, 2019
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One-step solid-phase boronation to fabricate self-supported porous FeNiB/FeNi foam for efficient electrocatalytic oxygen evolution and overall water splitting

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Abstract

Development of cost-effective and efficient oxygen-evolution electrocatalysts is urgently required for exploring renewable hydrogen energy and realizing large scale water splitting. In this work, self-supported FeNi@FeNiB-700 has been developed by a facile and environment-friendly solid-phase boronizing process, and it exhibits excellent catalytic activity toward the OER. It requires overpotentials of 272 mV (η10) and 399 mV (η100) to deliver oxygen-evolution current densities of 10 and 100 mA cm−2, respectively, outperforming many previously reported catalysts such as NiCo LDH nanosheets, Ni3S2/NF leaves, CoSe2 NS@CP, etc. The impressive electrocatalytic performance is attributed to the formation of loose and porous bi-metal borides on the surface of the electrode, which guarantees enhanced active surface area and rapid charge/mass transfer. Moreover, the optimum pair of porous Ni–P foam (cathode) ‖ FeNi@FeNiB-700 (anode) in a two-electrode alkaline water electrolyzer also possesses high durability and only requires a cell voltage of 1.65 V to deliver 10 mA cm−2. This study allows for large-scale application of cheap and efficient 3D bi-metal boride electrocatalysts for the oxygen evolution reaction and overall water splitting.

Graphical abstract: One-step solid-phase boronation to fabricate self-supported porous FeNiB/FeNi foam for efficient electrocatalytic oxygen evolution and overall water splitting

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Publication details

The article was received on 18 Apr 2019, accepted on 30 Jul 2019 and first published on 31 Jul 2019


Article type: Paper
DOI: 10.1039/C9TA04076E
J. Mater. Chem. A, 2019,7, 19554-19564

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    One-step solid-phase boronation to fabricate self-supported porous FeNiB/FeNi foam for efficient electrocatalytic oxygen evolution and overall water splitting

    H. Yuan, S. Wang, X. Gu, B. Tang, J. Li and X. Wang, J. Mater. Chem. A, 2019, 7, 19554
    DOI: 10.1039/C9TA04076E

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