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Constructing Bundle-like Co-Mn Oxide Electrocatalysts for Efficient Overall Water Splitting

Abstract

Making easy-to-make, cost-efficient, and durable bifunctional electrocatalysts for overall water splitting to produce oxygen and hydrogen is of paramount significance for future renewable energy system but still a challenge. Herein, the mesoporous CoMn and CoMnSe nanobundles are successfully constructed via a facile one-pot hydrothermal approach. It is discovered that the Mn introduction in Co oxide can simultaneously tune its electronic structure and modulate the nanobundle morphology. As a result, benefitting from the 3D open nanobundle structure, the self-supported Co1Mn1 oxide exhibit unprecedented oxygen evolution reaction (OER) with the ultralow overpotentials of 221 mV at 10 mA cm-2. Moreover, such nanobunle-like structure also enable the and Co1Mn1Se nanobundles to exhibit outstanding hydrogen evolution reaction (HER) activity with a relatively low overpotential of 87.3 mV at 10 mA cm-2, outperforming those of previously reported non-precious metals catalysts. More importantly, taking advantages of their excellent OER and HER activity, an advanced water electrolyzer through exploiting Co1Mn1 oxide and Co1Mn1Se nanobundles as anode and cathode is fabricated, which give an impressive water‐splitting current density of 10 mA cm-2 in 1.0 M KOH solution at 1.60 V with remarkable stability over 36 h, holding great potentials for efficient overall water splitting electrocatalysis.

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Publication details

The article was received on 01 Aug 2018, accepted on 08 Oct 2018 and first published on 09 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA07449F
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Constructing Bundle-like Co-Mn Oxide Electrocatalysts for Efficient Overall Water Splitting

    H. Xu, J. Wei, K. Zhang, M. Zhang, C. Liu, J. Guo and Y. Du, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA07449F

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