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Ni–Co hydroxide nanosheets on plasma-reduced Co-based metal–organic nanocages for electrocatalytic water oxidation

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Abstract

Development of highly efficient and low-cost electrocatalysts for the oxygen evolution reaction (OER) with high electrical conductivity and chemical stability is critical for various energy conversion devices and systems, yet still remains a formidable challenge. Herein, we develop a novel porous 3D hybrid nanostructure decorated with nickel cobalt layered double hydroxides (NiCo LDHs) on the surface of the functional ZIF-67 template with rich oxygen vacancies (VO) etched by O2–Ar radio frequency (RF) plasma. The as-prepared NiCo LDH@ZIF-67-VO/NF hybrid materials exhibit excellent OER performance evidenced by the competitive potential of 1.52 V at the current density of 10 mA cm−2 in alkaline medium. Moreover, the Tafel slope of 58 mV dec−1 is much lower compared to that of noble metal oxide and other counterpart catalysts. Our experimental and theoretical calculation results reveal that incorporation of VO into the NiCo LDH@ZIF-67-VO/NF composite can efficiently tune the electronic structure and also increase the water adsorption energy, ultimately accelerating the OER process. The work presents a novel strategy for designing highly efficient composite electrode materials with rich oxygen vacancies for the effective, scalable electrocatalytic water oxidation.

Graphical abstract: Ni–Co hydroxide nanosheets on plasma-reduced Co-based metal–organic nanocages for electrocatalytic water oxidation

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Publication details

The article was received on 03 Jan 2019, accepted on 05 Feb 2019 and first published on 06 Feb 2019


Article type: Paper
DOI: 10.1039/C9TA00070D
Citation: J. Mater. Chem. A, 2019, Advance Article

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    Ni–Co hydroxide nanosheets on plasma-reduced Co-based metal–organic nanocages for electrocatalytic water oxidation

    W. Chen, Y. Zhang, R. Huang, Y. Zhou, Y. Wu, Y. Hu and K. (. Ostrikov, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA00070D

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