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Construction of hierarchically porous graphitized carbon-supported NiFe layer double hydroxides with core-shell structure as an enhanced electrocatalyst for oxygen evolution reaction

Abstract

Oxygen evolution reaction (OER) is a vital half-reaction in water splitting and metal-air batteries. Developing earth-abundant, highly efficient and durable OER catalysts still faces huge challenges up to now, because OER is a strict kinetic sluggish process. Herein, we report the construction of hierarchically porous graphitized carbon (HPGC) supported NiFe layered double hydroxides (LDHs) with core-shell structure (denoted as HPGC@NiFe) by a facil strategy. The HPGC was first obtained by pyrolysing phenolic resin nanospheres with FeCl3 and ZnCl2 as the catalyst and the activator, respectively. Then the NiFe LDH arrays were directly grown on the HPGC by one-step hydrothermal method. The as-synthesized HPGC@NiFe reveals excellent OER properties with low onset potential, lower overpotential of 265 mV (corresponding to the current density at 10 mA/cm2) and small Tafel slope (56 mV per decade). And its catalytic activity is even superior to that of the start-of-the-art noble-metal catalyst IrO2/C. Notably, the HPGC@NiFe electrode shows admirable stability measured by 2000 cycle CVs and long-term electrolysis for 50 h. The prominent performance can be attributed to the synergistic effect between the NiFe-LDHs and the hierarchically porous graphitized carbon, in which the former can increase the exposure of the active sites, while the latter can increase the charge transfer efficiency. Our research implys the possibility for the development of the low-cost layered double hydroxides as a promising candidate in electrochemical energy storage and conversion equipments.

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Publication details

The article was received on 23 May 2017, accepted on 12 Jul 2017 and first published on 14 Jul 2017


Article type: Paper
DOI: 10.1039/C7NR03661B
Citation: Nanoscale, 2017, Accepted Manuscript
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    Construction of hierarchically porous graphitized carbon-supported NiFe layer double hydroxides with core-shell structure as an enhanced electrocatalyst for oxygen evolution reaction

    M. Cao, Y. Ni, L. Yao, Y. Wang, B. Liu and C. Hu, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR03661B

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