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引用次数: 0
摘要
晶粒尺寸较小的过渡金属氧化物是电容式电荷存储的理想候选材料。然而,这种氧化物材料的整体性能仍然受到低点密度和有限电导率的限制。在这里,我们提出了一种致密堆积的二氧化钛(TiO2)复合材料,它由三维排列的介孔二氧化钛微球和涂覆的超薄介孔碳壳组成。所制备的介孔介孔二氧化钛@介孔碳复合材料具有高可达表面积(134 m2 g-1)、双介孔通道(11.8 nm 和 21.6 nm)和更高的敲击密度(1.52 g cm-3)。不出所料,这种设计的介孔复合材料实现了卓越的电化学性能,包括 255 mAh g-1 的最大比容量和 0.025 A g-1 时 390 mAh cm-3 的体积容量。我们的介观复合电极可实现快速氧化还原反应,揭示了将导电致密介观结构作为高容量伪电容材料替代途径的重要性。
Transition metal oxides with small grain sizes are promising candidates for capacitive charge storage. However, the overall performance of such oxide materials is still limited by low tap density and finite conductivity. Here, we present a type of densely packed titanium dioxide (TiO2) composite that comprises three-dimensional aligned mesoporous TiO2 microspheres and coated ultrathin mesoporous carbon shells. The fabricated mesoporous meso-TiO2@meso-C complex possesses a highly accessible surface area (134 m2 g−1), dual mesopore channels (11.8 and 21.6 nm), and a much higher tap density (1.52 g cm−3). As expected, this designed mesoporous composite achieves superior electrochemical performance, including both a maximized specific capacity of 255 mAh g−1 and a volumetric capacity of 390 mAh cm−3 at 0.025 A g−1. Our mesoscopic composite electrode that enables fast redox reaction reveals the importance of incorporating conductive and dense mesostructures as an alternative pathway for high-volumetric pseudocapacitive materials.
期刊介绍:
Cell Reports Physical Science, a premium open-access journal from Cell Press, features high-quality, cutting-edge research spanning the physical sciences. It serves as an open forum fostering collaboration among physical scientists while championing open science principles. Published works must signify significant advancements in fundamental insight or technological applications within fields such as chemistry, physics, materials science, energy science, engineering, and related interdisciplinary studies. In addition to longer articles, the journal considers impactful short-form reports and short reviews covering recent literature in emerging fields. Continually adapting to the evolving open science landscape, the journal reviews its policies to align with community consensus and best practices.