International Journal of Hydrogen Energy, Vol.45, No.41, 21431-21441, 2020
Fe doped metal organic framework (Ni)/carbon black nanosheet as highly active electrocatalyst for oxygen evolution reaction
To alleviate the sluggish oxygen evolution reaction (OER) kinetics, it's urgent to develop electrocatalysts with high activity and low cost. In this work, Fe doped metal organic frameworks (Ni)/carbon black composites were synthesized via a facile hydrothermal method. Benefiting from the direct use of metal organic frameworks (MOFs) for OER, numerous and highly dispersed active sites are exposed to the electrolyte and reactants. By regulating Ni/Fe ratios, a high electrochemical active surface area (ECSA) and high relative surface content of active Ni3+ species are obtained, which mainly contribute to the high OER activity. Besides, the introduced carbon black (CB) was found to enhance the charge-transfer efficiency of the electrocatalysts, which is also favorable for OER. The optimal Ni9Fe1-BDC-0.15CB electrocatalyst shows excellent OER activity with the low overpotential of similar to 290 mV at 10 mA cm(-2) and the Tafel slope of similar to 76.1 mV dec(-1), which is comparable to RuO2 and other MOFs-based OER electrocatalysts reported in recent years. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.