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Type: Journal article
Title: Ultrathin nickel-cobalt inorganic-organic hydroxide hybrid nanobelts as highly efficient electrocatalysts for oxygen evolution reaction
Author: Wang, Y.
Huang, L.
Ai, L.
Wang, M.
Fan, Z.
Jiang, J.
Sun, H.
Wang, S.
Citation: Electrochimica Acta, 2019; 318:966-976
Publisher: Elsevier
Issue Date: 2019
ISSN: 0013-4686
Statement of
Ying Wang, Lan Huang, Lunhong Ai, Mei Wang, Zehui Fan, Jing Jiang, Hongqi Sun, Shaobin Wang
Abstract: The electronic properties of semiconducting electrocatalysts are of fundamental research interest and of great importance for oxygen evolution reaction (OER) from water splitting. Engineering the band levels is a promising route to design and fabricate nonprecious earth-abundant semiconducting electrocatalysts for OER. Herein, p-type semiconductor electrocatalysts of ultrathin nickel-cobalt inorganic-organic hydroxide hybrid nanobelts [CoₓNi₁₋ₓ(OH)(BzO)·H₂O, x = 0, 0.2, 0.5, 0.8, 1.0, BzO: benzoate] with favorable band structures are proposed. The CoxNi₁₋ₓ(OH)(BzO)·H₂O with the energetically favorable flat band level and well matched p-p junction exhibit remarkable OER performances in alkaline environment. The optimal Co₀.₈Ni₀.₂(OH)(BzO)·H₂O nanobelt electrocatalyst with nearly 4 nm in thickness achieves the superior OER performance, showing earlier onset potential (E(onset): 1.50 V vs RHE), smaller overpotential (η10: 319 mV) as well as significantly enhanced stability compared with those of IrO₂ reference (E(onset): 1.51 V vs RHE and η10: 343 mV) and most previously reported OER electrocatalysts. This electronic engineering strategy would provide a new insight to the fundamental understanding of underlying OER mechanism as well as open a new avenue to rational design of semiconducting electrocatalysts with high performances.
Keywords: Oxygen evolution reaction; electrocatalysis; nickel; cobalt; nanobelts
Rights: © 2019 Elsevier Ltd. All rights reserved.
DOI: 10.1016/j.electacta.2019.06.079
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