TY - JOUR
T1 - Engineering of Self-Aggregation-Resistant MnO2 Heterostructure with A Built-in Field for Enhanced High-Mass-Loading Energy Storage
AU - Wang, Jinxin
AU - Guo, Wei
AU - Liu, Zongxu
AU - Zhang, Qiuyu
N1 - Publisher Copyright:
© 2023 Wiley-VCH GmbH.
PY - 2023/5/25
Y1 - 2023/5/25
N2 - Although MnO2 has been intensively investigated for energy storage, further applications are limited by van der Waals force-triggered self-aggregation that always leads to poorly exposed active sites and compromised reaction dynamics, especially under high-mass-loading conditions. Herein, by synergistically coupling interfacial modulation with the Kirkendall effect, this work achieves in situ topological structure reorganization of MnOOH toward the high-aspect-ratio MnO2 heterostructure (Heter-MnO2) with fully exposed active sites, which is ready to assemble into self-supporting high-mass-loading film (30 mg cm−2) with restrained self-aggregation. Theoretical calculation and dynamics analysis results demonstrate the generation of the built-in field within the heterostructure, thus enhancing the electronic-transfer and ionic-adsorption/transport rates. As such, the 30 mg cm−2 Heter-MnO2 electrode achieves a superior areal capacitance of 4762 mF cm−2 at 1 mA cm−2 and a sound rate performance (79% at 100 mA cm−2) comparable to those of low-mass-loading/thin-film electrodes. As a proof of concept, the fabricated planar interdigital quasi-solid-state symmetric micro-supercapacitor (MSC) based on the Heter-MnO2 electrode can deliver a remarkable areal capacitance of 181 mF cm−2 and a considerable volumetric energy density of 10.3 mWh cm−3. This methodology highlights the promise of surface/interface chemistry modulation for the configuration of easy-to-integrate hierarchical nanostructures to better meet practical energy applications.
AB - Although MnO2 has been intensively investigated for energy storage, further applications are limited by van der Waals force-triggered self-aggregation that always leads to poorly exposed active sites and compromised reaction dynamics, especially under high-mass-loading conditions. Herein, by synergistically coupling interfacial modulation with the Kirkendall effect, this work achieves in situ topological structure reorganization of MnOOH toward the high-aspect-ratio MnO2 heterostructure (Heter-MnO2) with fully exposed active sites, which is ready to assemble into self-supporting high-mass-loading film (30 mg cm−2) with restrained self-aggregation. Theoretical calculation and dynamics analysis results demonstrate the generation of the built-in field within the heterostructure, thus enhancing the electronic-transfer and ionic-adsorption/transport rates. As such, the 30 mg cm−2 Heter-MnO2 electrode achieves a superior areal capacitance of 4762 mF cm−2 at 1 mA cm−2 and a sound rate performance (79% at 100 mA cm−2) comparable to those of low-mass-loading/thin-film electrodes. As a proof of concept, the fabricated planar interdigital quasi-solid-state symmetric micro-supercapacitor (MSC) based on the Heter-MnO2 electrode can deliver a remarkable areal capacitance of 181 mF cm−2 and a considerable volumetric energy density of 10.3 mWh cm−3. This methodology highlights the promise of surface/interface chemistry modulation for the configuration of easy-to-integrate hierarchical nanostructures to better meet practical energy applications.
KW - MnO heterostructure
KW - built-in field
KW - high-mass-loading energy storage
KW - interfacial modulation
KW - micro-supercapacitors
UR - http://www.scopus.com/inward/record.url?scp=85151981089&partnerID=8YFLogxK
U2 - 10.1002/aenm.202300224
DO - 10.1002/aenm.202300224
M3 - 文章
AN - SCOPUS:85151981089
SN - 1614-6832
VL - 13
JO - Advanced Energy Materials
JF - Advanced Energy Materials
IS - 20
M1 - 2300224
ER -