Hierarchical Nanostructured WO3 with Biomimetic Proton Channels and Mixed Ionic-Electronic Conductivity for Electrochemical Energy Storage

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• 作者：Zheng Chen ; Yiting Peng ; Fang Liu ; Zaiyuan Le ; Jian Zhu ; Gurong Shen ; Dieqing Zhang ; Meicheng Wen ; Shuning Xiao ; Chi-Ping Liu ; Yunfeng Lu ; Hexing Li
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：October 14, 2015
• 年：2015
• 卷：15
• 期：10
• 页码：6802-6808
• 全文大小：420K
• ISSN：1530-6992

文摘

Protein channels in biologic systems can effectively transport ions such as proton (H⁺), sodium (Na⁺), and calcium (Ca⁺) ions. However, none of such channels is able to conduct electrons. Inspired by the biologic proton channels, we report a novel hierarchical nanostructured hydrous hexagonal WO₃ (h-WO₃) which can conduct both protons and electrons. This mixed protonic鈥揺lectronic conductor (MPEC) can be synthesized by a facile single-step hydrothermal reaction at low temperature, which results in a three-dimensional nanostructure self-assembled from h-WO₃ nanorods. Such a unique h-WO₃ contains biomimetic proton channels where single-file water chains embedded within the electron-conducting matrix, which is critical for fast electrokinetics. The mixed conductivities, high redox capacitance, and structural robustness afford the h-WO₃ with unprecedented electrochemical performance, including high capacitance, fast charge/discharge capability, and very long cycling life (>50鈥?00 cycles without capacitance decay), thus providing a new platform for a broad range of applications.