Unlocking supercapacitive energy storage potential:Catalyzing electrochemically inactive manganese oxides to active MnO_(2)via heterostructure reconstruction  

作　　者：Baohong Zhang Tao Jiang Xinyan Zhou Xiaoyu Fan Binbin Jia Lidong Li 

机构地区：[1]School of Chemistry,Beihang University,Beijing 100191,China [2]College of Materials and Chemical Engineering,Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials,ChinaThree Gorges University,Yichang 443002,China [3]Chinese Academy of Sciences(CAS)Key Laboratory of Nanosystem and Hierarchy Fabrication,CAS Center for Excellence in Nanoscience,National Center for Nanoscience and Technology,Beijing 100190,China [4]Shanghai GTX Semiconductor Co.,Ltd.,Shanghai 201806,China

出　　处：《Nano Research》2024年第7期5897-5906,共10页纳米研究（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52272181,51872016,and 52201261).

摘　　要：Advancing supercapacitor system performance hinges on the innovation of novel electrode materials seamlessly integrated within distinct architectures.Herein,we introduce a direct approach for crafting nanorod arrays featuring crystalline/amorphous CuO/MnO_(2)−x.This reconfigured heterostructure results in an elevated content of electrochemically active MnO_(2).The nanorod arrays serve as efficient capacitive anodes and are easily prepared via low-potential electrochemical activation.The resulting structure spontaneously forms a p–n heterojunction,developing a built-in electric field that dramatically facilitates the charge transport process.The intrinsic electric field,in conjunction with the crystalline/amorphous architecture,enables a large capacitance of 1.0 F·cm^(−2)at 1.0 mA·cm^(−2),an ultrahigh rate capability of approximately 85.4%at 15 mA·cm^(−2),and stable cycling performance with 92.4%retention after 10,000 cycles.Theoretical calculations reveal that the presence of heterojunctions allows for the optimization of the electronic structure of this composite,leading to improved conductivity and optimized OH−adsorption energy.This work provides new insights into the rational design of heterogeneous nanostructures,which hold great potential in energy storage applications.

关 键 词：RECONFIGURATION active MnO_(2) crystalline/amorphous structure p-n heterojunction SUPERCAPACITOR 

分 类 号：O643.3[理学—物理化学]