Nanoengineering of ZnCo2O4@CoMoO4 heterogeneous structures for supercapacitor and water splitting applications

• Published in: Ceramics international Vol. 49; no. 3; pp. 4422 - 4434
• Main Authors: Yang, Wen-Duo, Xiang, Jun, Zhao, Rong-Da, Loy, Sroeurb, Li, Mei-Ting, Ma, Dong-Mei, Li, Jia, Wu, Fu-Fa
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.02.2023
• Subjects: Cycle retention; Electrocatalyst; Heterogeneous structure; Hydrothermal; Supercapacitor; ZnCo2O4@CoMoO4; Supercapacitor; ZnCo2O4@CoMoO4; Electrocatalyst; Cycle retention; Heterogeneous structure; Hydrothermal
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2022.09.329

A hybrid ZnCo2O4@CoMoO4 heterogeneous structure deposited onto nickel foam was synthesized via a two-step hydrothermal process. The results demonstrate that the hybrid architecture exhibits excellent electrochemical performance, including the specific capacitance of 1040C g−1 at 1 A g−1 for hybrid structures, high energy density of 87.3 Wh kg−1 at a power density of 2700 W kg−1 for an as-assembled supercapacitor and excellent cycle stability with a capacity retention of 99% undergoing 8000 charge-discharge for the device. Moreover, it also shows favorable electrocatalytic activity with low overpotentials of 237 mV at 20 mA cm−2 for oxygen evolution reaction and 114 mV at 10 mA cm−2 for hydrogen evolution reaction, and low cell voltage of 1.54 V at 10 mA cm−2 for overall water splitting. In addition, the stability maintains well for the long-term use of 13 h. We believe that this hybrid ZnCo2O4@CoMoO4 heterogeneous structure could be a promising candidate for future energy storage and conversion.