Hollow MO x -RuO2 (M = Co, Cu, Fe, Ni, CuNi) nanostructures as highly efficient electrodes for supercapacitors
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- 作者：Qiangqiang Tan 谭强强 ; Pengfei Wang 王鹏飞 ; Hui Liu 刘卉 ; Yuxing Xu 徐宇兴…
- 刊名：Science China Materials
- 出版年：2016
- 出版时间：May 2016
- 年：2016
- 卷：59
- 期：5
- 页码：323-336
- 全文大小：2,499 KB
- 刊物类别：Materials Science, general; Chemistry/Food Science, general;
- 刊物主题：Materials Science, general; Chemistry/Food Science, general;
- 出版者：Science China Press
- ISSN：2199-4501
- 卷排序：59
文摘
Engineering the internal structure and chemical composition of nanomaterials in a cost-effective way has been challenging, especially for enhancing their performance for a given application. Herein, we report a general strategy to fabricate hollow nanostructures of ruthenium-based binary or ternary oxides via a galvanic replacement process together with a subsequent thermal treatment. In particular, the as-prepared NiO-RuO2 hollow nanostructures loaded on carbon nanotubes (hNiO-RuO2/CNT) with RuO2 mass ratio at 19.6% for a supercapacitor adopting the KOH electrolyte exhibit high specific capacitances of 740 F g−1 at a constant current density of 1 A g−1 with good cycle stability. The specific capacitance for hNiO-RuO2/CNT electrodes maintains 638.4 F g−1 at a current density of 5 A g−1. This simple approach may shed some light on the way for making a wide range of metal oxides with tunable nanostructures and compositions for a variety of applications.Keywordsruthenium-based oxideshollow nanostructuresgalvanic replacement reactionsupercapacitorspecific capacitance