
Fe-doped NiCo2O4 hollow hierarchical sphere as an efficient electrocatalyst for oxygen evolution reaction
Wenqing ZHENG, Han SUN, Xinping LI, Shu ZHANG, Zhuoxun YIN, Wei CHEN, Yang ZHOU
Front. Mater. Sci. ›› 2021, Vol. 15 ›› Issue (4) : 577-588.
Fe-doped NiCo2O4 hollow hierarchical sphere as an efficient electrocatalyst for oxygen evolution reaction
We prepared porous Fe-doped nickel cobaltate (Fe-NiCo2O4) hollow hierarchical nanospheres through a facile self-templated synthetic strategy. Due to the porous hollow structure and composition, the Fe-NiCo2O4 presented vastly superior electrocatalytic activity for the oxygen evolution reaction (OER), compared with NiCo2O4 and the majority of other OER catalysts. With an aim of stimulating a current density of 10 mA·cm−2, the Fe-NiCo2O4 catalyst needs an overpotential of 210 mV, which is on a par with the general properties of commercial IrO2. In addition, the Fe-NiCo2O4 catalyst performed stably in long-term testing. The excellent activity and long-term stability showed that such catalysts have great promise for widespread application in the field of water splitting.
ion exchange / hierarchical nanostructure / electronic structure transfer / oxygen evolution reaction / water splitting
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