Abstract
Amorphous CoOOH films were fabricated on hexagonal graphite substrates in 0.2 M CoSO4 at a constant anodic deposition potential of 1.60 V vs Ag/AgCl (3 M KCl) under different deposition temperatures, and their electrochemical behaviors in 1 M NaOH and 1 M NaCl were systematically studied. The results showed that the deposition temperature had a significant effect on the electrochemical behaviors of the CoOOH films. For the four CoOOH films prepared under different deposition temperatures, when tested either in 1 M NaOH or 1 M NaCl, their area specific capacitance (C A) and cycle stability increased monotonously, their mass specific capacitance (C M) first increased and then decreased, while their bulk resistance (R bulk) and charge-transfer resistance (R ct) first decreased and then increased with increasing deposition temperature. In addition, the CoOOH films had high C M, good electrical conductivity, low faradic charge-transfer resistance, and low diffusive resistance. Among the four CoOOH films fabricated under different deposition temperatures, the film prepared under a deposition temperature of 45 °C (Sample 3) had the highest C M, the lowest R bulk, the lowest R ct, and good rate capability which can be ascribed to its structure with nanoparticles and nodules on its surface as well as its appropriate thickness. As a result, the CoOOH film fabricated by anodic deposition is a very promising electrochemical capacitor material for applications.
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The authors are grateful to Doctoral Fund of Southwest University of Science and Technology, China (08ZX7113) for their financial support.
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Guo, B., Li, T. & Hu, H. Anodic deposition of CoOOH films with excellent performance for electrochemical capacitors. J Appl Electrochem 46, 403–421 (2016). https://doi.org/10.1007/s10800-016-0920-x
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DOI: https://doi.org/10.1007/s10800-016-0920-x