Design and Tailoring of the 3D Macroporous Hydrous RuO2 Hierarchical Architectures with a Hard-Template Method for High-Performance Supercapacitors

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• 作者：Zhikun Peng ; Xu Liu ; Huan Meng ; Zhongjun Li ; Baojun Li ; Zhongyi LiuShouchang Liu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：February 8, 2017
• 年：2017
• 卷：9
• 期：5
• 页码：4577-4586
• 全文大小：834K
• ISSN：1944-8252

文摘

In this work, RuO₂ honeycomb networks (RHCs) and hollow spherical structures (RHSs) were rationally designed and synthesized with modified-SiO₂ as a sacrificial template via two hydrothermal approaches. At a high current density of 20 A g^–1, the two hierarchical porous RuO₂·xH₂O frameworks showed the specific capacitance as high as 628 and 597 F g^–1; this is about 80% and 75% of the capacitance retention of 0.5 A g^–1 for RHCs and RHSs, respectively. Even after 4000 cycles at 5 A g^–1, the RHCs and RHSs can still remain at 86% and 91% of their initial specific capacitances, respectively. These two hierarchical frameworks have a well-defined pathway that benefits for the transmission/diffusion of electrolyte and surface redox reactions. As a result, they exhibit good supercapacitor performance in both acid (H₂SO₄) and alkaline (KOH) electrolytes. As compared to RuO₂ bulk structure and similar RuO₂ counterpart reported in pseudocapacitors, the two hierarchical porous RuO₂·xH₂O frameworks have better energy storage capabilities, high-rate performance, and excellent cycling stability.