High Surface Area Tunnels in Hexagonal WO3

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• 作者：Wanmei Sun ; Michael T. Yeung ; Andrew T. Lech ; Cheng-Wei Lin ; Chain Lee ; Tianqi Li ; Xiangfeng Duan ; Jun Zhou ; Richard B. Kaner
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：July 8, 2015
• 年：2015
• 卷：15
• 期：7
• 页码：4834-4838
• 全文大小：294K
• ISSN：1530-6992

文摘

High surface area in h-WO₃ has been verified from the intracrystalline tunnels. This bottom-up approach differs from conventional templating-type methods. The 3.67 脜 diameter tunnels are characterized by low-pressure CO₂ adsorption isotherms with nonlocal density functional theory fitting, transmission electron microscopy, and thermal gravimetric analysis. These open and rigid tunnels absorb H⁺ and Li⁺, but not Na⁺ in aqueous electrolytes without inducing a phase transformation, accessing both internal and external active sites. Moreover, these tunnel structures demonstrate high specific pseudocapacitance and good stability in an H₂SO₄ aqueous electrolyte. Thus, the high surface area created from 3.67 脜 diameter tunnels in h-WO₃ shows potential applications in electrochemical energy storage, selective ion transfer, and selective gas adsorption.