Sm 0.5 Sr 0.5 Co 1-x Ni x O 3-δ -A Novel Bifunctional Electrocatalyst for Oxygen Reduction/Evolution Reactions

• Published in: Molecules (Basel, Switzerland) Switzerland), 2022-02, Vol.27 (4)
• Main Authors: Liu, Xingmei, Wang, Yuwei, Fan, Liquan, Zhang, Weichao, Cao, Weiyan, Han, Xianxin, Liu, Xijun, Jia, Hongge
• Format: Article
• Language: English
• ISSN: 1420-3049
• DOI: 10.3390/molecules27041263

The development of non-precious metal catalysts with excellent bifunctional activities is significant for air-metal batteries. ABO -type perovskite oxides can improve their catalytic activity and electronic conductivity by doping transition metal elements at B sites. Here, we develop a novel Sm Sr Co Ni O (SSCN) nanofiber-structured electrocatalyst. In 0.1 M KOH electrolyte solution, Sm Sr Co Ni O (SSCN82) with the optimal Co: Ni molar ratio exhibits good electrocatalytic activity for OER/ORR, affording a low onset potential of 1.39 V, a slight Tafel slope of 123.8 mV dec , and a current density of 6.01 mA cm at 1.8 V, and the ORR reaction process was four-electron reaction pathway. Combining the morphological characteristic of SSCN nanofibers with the synergistic effect of cobalt and nickel with a suitable molar ratio is beneficial to improving the catalytic activity of SSCN perovskite oxides. SSCN82 exhibits good bi-functional catalytic performance and electrochemical double-layer capacitance.