US EPA

7010140 

Journal Article 

Fabrication, structure, electrochemical properties, and enhanced pseudocapacitive performance of cobalt oxyhydroxide films via a simple strategy 

Guo, B; Li, T; Liu, H; Xie, R; Zhang, X; Huang, H; Li, Y; Ma, Y; Huo, J; , 

2020 

Yes 

Ionics
ISSN: 0947-7047
EISSN: 0388-659X 

SPRINGER HEIDELBERG 

HEIDELBERG 

26 

1 

423-439 

10.1007/s11581-019-03190-3 

WOS:000511724100042 

Cobalt oxyhydroxide (CoOOH) has recently emerged as a promising electrode material for energy storage. Herein amorphous CoOOH and Mn-doped CoOOH films were prepared by anodic deposition, and the effect of Mn doping on the pseudocapacitive behaviors of CoOOH material was investigated. When tested in 1 M NaOH, the area specific capacitance (C-A, F cm(-2)) of CoOOH material can be increased by doping 7.59 at. % Mn due to much increased surface area. When tested in 1 M NaCl, the C-A of 7.59 at. % Mn-doped CoOOH film increased with the increasing CV cycle number during similar to 100-1000 CV cycle, and became more and more larger than that of CoOOH film during 434-1000 CV cycle, which was mainly attributed to the increasing surface area during CV test. These indicated that surface area was a vital factor to improve the pseudocapacitive behaviors of CoOOH material. Consequently, depositing a fine nanostructured CoOOH film onto a conductive, porous and high surface area substrate is considered as an effective method to further improve its pseudocapacitive behaviors. 

Cobalt oxyhydroxide; Mn doping; Pseudocapacitive behavior; Electrochemical capacitor