Rare Metals

, Volume 35, Issue 12, pp 930–936 | Cite as

In situ two-step electrochemical preparation of fluoride-free nickel-based compound film on nickel plate for supercapacitors

  • Zhi-Biao Zou
  • Xin-Bo Xiong
  • Jun Ma
  • Xie-Rong Zeng
  • Tuo Huang
  • Jun-Jie Li
  • Bin Li
Article

Abstract

A nickel-based compound layer was prepared on a nickel plate by anodization in a 75 wt% H3PO4 solution containing NH4F. This layer was then treated by galvanostatic charge/discharge (GCD) until a black outer layer was detached, leaving behind a film on the nickel plate as a binder-free electrode material for supercapacitors. The microstructural characterization shows that the film consists of Ni(OH)2 and NiO, and no fluoride is found in the as-obtained film. Electrochemical tests demonstrate that this fluoride-free film electrode exhibits a high capacitance of 954 F·g−1 at 7.5 A·g−1, excellent rate capability (a 19.5 % capacitance reduction with the current density increasing to 120 A·g−1) and cycling stability. Within 3500 cycles, the specific capacitance does not decrease, but rather increases from 840 F·g−1 to approximately 1092 F·g−1 in the first 100 cycles at 60 A·g−1, and remains stable until the aforementioned layer is detached.

Keywords

Nickel Film Anodization Supercapacitor 

Notes

Acknowledgments

This work was financially supported by the Natural Science Foundation of Guangdong Province, China (No. 2015A030313559), the Basic Research Project of Knowledge Innovation Program in Shenzhen (No. GJHS20120621155123009) and the Innovation and Cultivation Program of College Students in Science and Technology of (Climbing Program) in Guangdong Province (No. 000018).

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Copyright information

© The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Shenzhen Key Laboratory of Special Functional Materials, Department of Materials Science and EngineeringShenzhen UniversityShenzhenChina

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