Abstract
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.
摘要
以低成本的方式调控纳米材料的内部结构和化学成分对增强其在特定应用中的性能非常重要, 但挑战巨大. 本文将电置换反应与一种热处理过程相结合, 报道了一种具有普适性的途径制备钌基二元和三元氧化物纳米中空结构, 并测定了其作为超级电容器电极材料的性能. 结果表明, 采用KOH为电解质, 在RuO2的质量分数仅为19.6%时, 所获得的负载于碳纳米管表面的中空NiO-RuO2纳米结构在恒电流密度为1A g-1时具有740 F g-1的比容量, 并且具有良好的循环稳定性. 在恒电流密度为5 A g-1时, 比容量仍可以保持在638.4 F g-1.本文以RuO2提高过渡金属的导电性, 以过渡金属降低RuO2材料成本并结合中空结构增加材料表面积的思路, 可以借鉴用来制备其它金属氧化物体系以满足特定应用的需求.
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Qiangqiang Tan received his PhD degree in physical chemistry of metallurgy at the University of Science and Technology Beijing in 2003. After two years of postdoctoral research at the Institute of Electrical Engineering, Chinese Academy of Sciences (IPE-CAS), he joined the State Key Laboratory of Multi-phase Complex System, IPE-CAS, as an associate professor, and was then promoted to be a full professor. His research interest focuses on novel materials for energy conversion and storage, novel ceramics materials, and comprehensive utilization of ore resources.
Pengfei Wang received his BSc degree in chemical engineering and processing at Harbin Engineering University in 2012. He is currently a PhD student at the Institute of Process Engineering, Chinese Academy of Sciences (IPE-CAS).His research focuses on the metal oxide-based nanocomposites as highly efficient electrode materials for supercapacitors.
Jun Yang received his PhD degree in chemical and biomolecular engineering in 2006 fromNationalUniversity of Singapore. After postdoctoral research at Boston College andUniversity of Toronto, he joined the Institute of Bioengineering andNanotechnology, Singapore in 2007. In 2010, he moved to the Institute of Process Engineering, Chinese Academy of Sciences as the group leader of Materials for Energy Conversion and Environmental Remediation (MECER). His main research interests include applied catalysis, nanocomposites for energy conversion, synthesis and application of novel nanocrystalline materials, and separation techniques.
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Tan, Q., Wang, P., Liu, H. et al. Hollow MO x -RuO2 (M = Co, Cu, Fe, Ni, CuNi) nanostructures as highly efficient electrodes for supercapacitors. Sci. China Mater. 59, 323–336 (2016). https://doi.org/10.1007/s40843-016-5057-8
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DOI: https://doi.org/10.1007/s40843-016-5057-8