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

详细信息    查看全文

• 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, RuOb>2b> honeycomb networks (RHCs) and hollow spherical structures (RHSs) were rationally designed and synthesized with modified-SiOb>2b> as a sacrificial template via two hydrothermal approaches. At a high current density of 20 A g^–1, the two hierarchical porous RuOb>2b>·xHb>2b>O 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 (Hb>2b>SOb>4b>) and alkaline (KOH) electrolytes. As compared to RuOb>2b> bulk structure and similar RuOb>2b> counterpart reported in pseudocapacitors, the two hierarchical porous RuOb>2b>·xHb>2b>O frameworks have better energy storage capabilities, high-rate performance, and excellent cycling stability.