Microwave-assisted fast synthesis of hierarchical NiCo2O4 nanoflower-like supported Ni(OH)2 nanoparticles with an enhanced electrocatalytic activity towards methanol oxidation

作者：Wang, Bingrong; Cao, Yang; Chen, Yong; Wang, Ruzhi; Wang, Xiaohong; Lai, Xiaoyong; Xiao, Chunhui; Tu, Jinchun^*; Ding, Shujiang^*

来源：Inorganic Chemistry Frontiers, 2018, 5(1): 172-182.

DOI：10.1039/c7qi00583k

• GLASSY-CARBON ELECTRODE
• HYDROTHERMAL SYNTHESIS
• ELECTROCHEMICAL PERFORMANCE
• EFFICIENT ELECTROCATALYSTS
• NICKEL COBALTITE
• NANOWIRE ARRAYS
• EDGE SITES
• NANOSHEETS
• SUPERCAPACITOR
• NANOSTRUCTURES

NiCo2O4 nanoflowers were synthesized through a microwave-assisted hydrothermal method and used as a type support for Ni(OH)(2) nanoparticles. In the three-dimensional NiCo2O4 nanoflowers, twodimensional ultrathin nanosheets supported the Ni(OH)(2) nanoparticles by homogeneous precipitation. The materials were characterized by field-emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. The electrochemical oxidation of methanol was probed through the NiCo2O4/Ni(OH)(2) modification on a glassy carbon electrode in an alkaline medium by employing cyclic voltammetry (CV) and chronoamperometry (CA). The current density of the NiCo2O4/ Ni(OH)(2) electrode in 1 M KOH with 0.5 M methanol ascends to 92.3 A g(-1) and restores to 94.6% of the primitive value through the replacement with a new solution after a long-term CV cycling (500 cycles). Therefore, the compounds further corroborate their excellent electrocatalytic activity and superb perennial stability for methanol oxidation. This study demonstrates that NiCo2O4/ Ni(OH)(2) is a peculiar material with an outstanding performance in direct methanol fuel cells.

• 出版日期2018-1
• 单位宁夏大学; 海南大学; 北京工业大学; 西安交通大学