Controllable Synthesis of Fe‐Doped NiCo<sub>2</sub>O<sub>4</sub> Nanobelts as Superior Catalysts for Oxygen Evolution Reaction
Pengkun Wei, Yang Yang, Hongzhi Kang, Zewei Hao, Donggang Guo, Lu Liu
Abstract
Abstract As one of the promising clean and renewable technologies, water splitting has been a hot topic, especially the half‐reaction of oxygen evolution reaction (OER) due to its sluggish and complex kinetics. Hence, Fe‐doped NiCo 2 O 4 nanobelts were designed and prepared as catalysts toward OER. By increasing the Fe amount, the catalytic performances of the as‐synthesized products went up and then decreased. Profiting from the synergistic effect between Fe atom and NiCo 2 O 4 , all the Fe‐NiCo 2 O 4 catalysts exhibited superior catalytic activities to the corresponding NiCo 2 O 4 . In addition, the characteristic nanobelt architecture facilitates the conduction of electrons and the exposure of active sites. With the optimal Fe content, the 9.1 % Fe‐NiCo 2 O 4 yielded the smallest overpotential and Tafel slope among the catalysts, distinctly lower than that of RuO 2 .