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Synergistic tuning of oxygen vacancies and d-band centers of ultrathin cobaltous dihydroxycarbonate nanowires for enhanced electrocatalytic oxygen evolution

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Abstract

Simple and controllable synthesis of efficient and robust non-noble metal electrocatalysts towards the oxygen evolution reaction (OER) is highly desired and challenging in the development of sustainable energy conversion technologies. Herein, we report a facile one-step solvothermal synthesis of cobaltous dihydroxycarbonate nanowires (Co-OCH NWs) with a tunable diameter ranging from 8.7 to 16.7 nm, which were able to exhibit an interesting diameter-dependent catalytic activity towards the OER. It should be highlighted that the thinnest nanowires (8.7 nm) demonstrated the best OER catalytic activity among the as-prepared nanowires, showing an overpotential of only 307 mV at 10 mA cm−2 and a Tafel slope of 75 mV dec−1 in 1.0 M KOH solution. Based on comprehensive analysis, the excellent electrocatalytic activity of Co-OCH NWs was ascribed to the simultaneous achievement of an enlarged specific surface area, increased oxygen vacancy concentration and favorable position of the 3d-band center for the Co-OCH NWs with the continuous decrease of their diameters. More importantly, this work has emphasized that synergistic tuning of the oxygen vacancy concentration and d-band center position of nanomaterials via facile size control enables boosting their electrocatalytic performance substantially, thereby opening a simple route to design and prepare Earth-abundant electrocatalysts with higher efficiency and lower cost.

Graphical abstract: Synergistic tuning of oxygen vacancies and d-band centers of ultrathin cobaltous dihydroxycarbonate nanowires for enhanced electrocatalytic oxygen evolution

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Supplementary files

Article information


Submitted
20 Mar 2020
Accepted
01 May 2020
First published
01 May 2020

Nanoscale, 2020, Advance Article
Article type
Paper

Synergistic tuning of oxygen vacancies and d-band centers of ultrathin cobaltous dihydroxycarbonate nanowires for enhanced electrocatalytic oxygen evolution

C. He, M. Huang, G. Wang, Y. Zhang, X. Li, L. Fan and Y. Li, Nanoscale, 2020, Advance Article , DOI: 10.1039/D0NR02264K

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