Controllable Synthesis of Fe‐Doped NiCo2O4 Nanobelts as Superior Catalysts for Oxygen Evolution Reaction. Issue 60 (24th September 2020)

• Record Type: Journal Article
• Authors: Wei, Pengkun; Yang, Yang; Kang, Hongzhi; Hao, Zewei; Guo, Donggang; Liu, Lu
• Is Part Of: Chemistry. Volume 26:Issue 60(2020)
• Page Start: 13725
• Page End: 13729
• Publication Date: 2020-09-24
• Subjects: catalytic performances -- Fe-doped NiCo2O4 nanobelts -- oxygen evolution reaction -- water splitting; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.202001082
• Languages: English
• ISSNs: 0947-6539

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 NiCo2 O4 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 NiCo2 O4, all the Fe‐NiCo2 O4 catalysts exhibited superior catalytic activities to the corresponding NiCo2 O4 . 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‐NiCo2 O4 yielded the smallest overpotential and Tafel slope among the catalysts, distinctly lower than that of RuO2 . Abstract : New NiCo2 O4 nanobelts with the addition of Fe have been first fabricated through a facile hydrothermal approach. Surprisingly, by adjusting the Fe amount, the width of the nanobelt could be tuned. In addition, the Fe presence effectively improved the electrical conductivity and catalytical activity of NiCo2 O4 in the electrochemical oxygen evolution reaction process. With the optimized Fe content, the overpotential of the 9.1 % Fe‐NiCo2 O4 catalyst requires merely 265 mV to reach a current density of 10 mA cm −1, and displays an excellent durability.