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https://hdl.handle.net/2440/121135
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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 1873-3859 |
Statement of Responsibility: | 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 |
Grant ID: | http://purl.org/au-research/grants/arc/DP170104264 |
Published version: | http://dx.doi.org/10.1016/j.electacta.2019.06.079 |
Appears in Collections: | Aurora harvest 4 Chemical Engineering publications |
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