Issue 11, 2018

Imidazolate-mediated assembled structures of Co-LDH sheets for efficient electrocatalytic oxygen evolution

Abstract

To fully achieve an eco-friendly means of storing electricity in the form of chemical fuels, the development of a green synthetic route to highly active oxygen evolution reaction (OER) electrocatalysts is required. In this work, imidazolate-induced production of cobalt layered double hydroxide (Co-LDH) electrocatalysts with different assembled structures is presented. Porous Co-LDHs exhibit a remarkable OER catalytic performance with a low overpotential of η10 = 312 mV, while cage-like Co-LDHs prepared by the transformation of ZIF-67 show a slightly inferior performance. Such a phenomenon is attributed to the assembled structure difference, giving rise to a difference in electron transfer and mass transport as well as the number of accessible active sites. After disassembly, these disperse Co-LDH sheets give a similar catalytic performance (η10: 288–290 mV) due to bearing similar components. Importantly, the reversible/cycling transformation between Co-LDHs and ZIF-67 provides an effective method to radically reduce pollutant release and resource consumption, from the point of view of material synthesis.

Graphical abstract: Imidazolate-mediated assembled structures of Co-LDH sheets for efficient electrocatalytic oxygen evolution

Supplementary files

Article information

Article type
Communication
Submitted
19 Dec 2017
Accepted
22 Feb 2018
First published
22 Feb 2018

J. Mater. Chem. A, 2018,6, 4636-4641

Imidazolate-mediated assembled structures of Co-LDH sheets for efficient electrocatalytic oxygen evolution

L. Chen, Y. Guo, H. Wang, Z. Gu, Y. Zhang, X. Li, H. Wang and C. Duan, J. Mater. Chem. A, 2018, 6, 4636 DOI: 10.1039/C7TA11078B

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