Precisely designed mesoscopic titania for high-volumetric-density pseudocapacitance

Kun Lan, Lu Liu, Jun Ye Zhang, Ruicong Wang, Lianhai Zu, Zirui Lv, Qiulong Wei, Dongyuan Zhao

Research output: Contribution to journalArticleResearchpeer-review

15 Citations (Scopus)

Abstract

Surface redox pseudocapacitance, which enables short charging times and high power delivery, is very attractive in a wide range of sites. To achieve maximized specific capacity, nanostructuring of active materials with high surface area is indispensable. However, one key limitation for capacitive materials is their low volumetric capacity due to the low tap density of nanomaterials. Here, we present a promising mesoscale TiO2structure with precisely controlled mesoporous frameworks as a high-density pseudocapacitive model system. The dense-packed mesoscopic TiO2in micrometer size offers a high accessible surface area (124 m2g-1) and radially aligned mesopore channels, but high tap density (1.7 g cm-3) that is much higher than TiO2nanoparticles (0.47 g cm-3). As a pseudocapacitive sodium-ion storage anode, the precisely designed mesoscopic TiO2model achieved maximized gravimetric capacity (240 mAh g-1) and volumetric capacity (350 mAh cm-3) at 0.025 A g-1. Such a designed pseudocapacitive mesostructure further realized a commercially comparable areal capacity (2.1 mAh cm-2) at a high mass loading of 9.47 mg cm-2. This mesostructured electrode that enables fast sodiation in dense nanostructures has implications for high-power applications, fast-charging devices, and pseudocapacitive electrode design.

Original languageEnglish
Pages (from-to)14097-14105
Number of pages9
JournalJournal of the American Chemical Society
Volume143
Issue number35
DOIs
Publication statusPublished - 8 Sep 2021

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