期刊
JOURNAL OF POWER SOURCES
卷 333, 期 -, 页码 53-60出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2016.09.152
关键词
NiFe layered double hydroxide; Reduced graphene oxide; Oxygen evolution reaction; Oxygen reduction reaction
资金
- National Natural Science Foundation of China [21173135, 21403121, 21573133]
- Natural Science Foundation of Shandong Province, China [ZR2014JL013, ZR2013BQ013]
- open foundation from the Key Laboratory of Marine Bioactive Substance and Modern Analysis Technology, SOA [MBSMAT-2015-04, MBSMAT-2014-02, MBSMAT-2013-01, MBSMAT-2012-07]
Highly active and low-cost bifunctional electrocatalysts for oxygen evolution and reduction reactions (OER and ORR) hold a heart position for the renewable energy technologies such as metal-air batteries and fuel cells. Here, we reported the synthesis of NiFe layered double hydroxide/reduced graphene oxide (NiFe-LDH/rGO) nanohybrid via the facile solvothermal method followed by chemical reduction. The template role of surfactant and the hybridization of rGO supplied the NiFe-LDH/rGO catalyst with a porous nanostructure and an enhanced conductivity, favoring both mass transport and charge communication of electrocatalytic reactions. The NiFe-LDH/rGO composite not only displayed highly efficient OER activity in alkaline solution with a low onset overpotential of 240 mV, but also only needed an overpotential of 250 mV to reach the 10 mA cm(-2) current density. The NiFe-LDH/rGO nanohybrid also offered excellent ORR catalytic activity with onset potential at 0.796 V in alkaline media. The rotating disk and rotating-ring-disk electrodes both revealed that the ORR on NiFe-LDH/rGO mainly involved a direct four-electron reaction pathways accompanying part of the two-electron process. The excellent bifunctional activity of the NiFe-LDH/rGO nanohybrid could be attributed to the synergistic effects of rGO and NiFe-LDH components due to the strongly coupled interactions. (C) 2016 Elsevier B.V. All rights reserved.
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