Enhanced electrochemical performance in an aluminium doped delta-MnO2 supercapacitor cathode: experimental and theoretical investigations

Wan, Jing1; Ji, Peiyuan1; Li, Bangxing1; Xi, Yi1; Gu, Xiao2; Huang, Li3,4; He, Mingquan1; Hu, Chenguo1

2021-12-01

10.1039/d1cc06198d

CHEMICAL COMMUNICATIONS   影响因子和分区

1359-7345

1364-548X

One of the biggest challenges faced by the layered manganese oxide MnO2 used as a supercapacitor cathode is the capacity fading caused by chemo-mechanical degradation and/or structural transformation occurring in the discharging/charging process. Here, based on systematical experimental measurements and theoretical calculations, we show that both the stability and rate performance of the delta-MnO2 supercapacitor cathode can be significantly enhanced by Al doping. Compared with pure delta-MnO2, Al doping (delta-Al0.06MnO2) clearly improves the specific capacitance (7% enhancement at 0.1 mA cm(-2)) and cycling stability (12% enhancement after 5000 cycles) simultaneously. These improvements can be attributed to the enhanced electronic transport and formation of more active sites, which are introduced by Al doping. Additionally, our calculations demonstrate that the doped systems (Al atoms located at Mn or O sites) show smaller surface energies than that of pure delta-MnO2, which hinders side reactions or structure transformations and leads to a better cycling lifetime. Our work gives a comprehensive understanding of the impacts on the performance of delta-MnO2 introduced by Al doping, and provides a feasible scheme to study the electrochemical mechanism of metal-doped delta-MnO2.

SCI ; EI

英语

NI期刊

其他

National Natural Science Foundation of China[11904040,51732005] ; Chongqing Research Program of Basic Research and Frontier Technology, China[cstc2020jcyj-msxmX0263] ; Fundamental Research Funds for the Central Universities, China["2020CDJQY-A056","2020CDJ-LHZZ-010","2020CDJQYZ006"] ; Projects of President Foundation of Chongqing University, China[2019CDXZWL002] ; Guangdong Provincial Key Laboratory of Energy Materials for Electric Power[2018B030322001]

Chemistry

Chemistry, Multidisciplinary

WOS:000730759000001

ROYAL SOC CHEMISTRY

20220311473703

Aluminum ; Cathodes ; Supercapacitor

Aluminum:541.1 ; Electric Components:704.1 ; Chemical Products Generally:804

CHEMISTRY

Web of Science

1.Chongqing Univ, Dept Appl Phys, Chongqing 400044, Peoples R China
2.Ningbo Univ, Sch Phys Sci & Technol, Ningbo 315000, Peoples R China
3.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
4.Southern Univ Sci & Technol, Guangdong Prov Key Lab Energy Mat Elect Power, Shenzhen 518055, Peoples R China

Wan, Jing,Ji, Peiyuan,Li, Bangxing,et al. Enhanced electrochemical performance in an aluminium doped delta-MnO2 supercapacitor cathode: experimental and theoretical investigations[J]. CHEMICAL COMMUNICATIONS,2021,58:589-592.

Wan, Jing.,Ji, Peiyuan.,Li, Bangxing.,Xi, Yi.,Gu, Xiao.,...&Hu, Chenguo.(2021).Enhanced electrochemical performance in an aluminium doped delta-MnO2 supercapacitor cathode: experimental and theoretical investigations.CHEMICAL COMMUNICATIONS,58,589-592.

Wan, Jing,et al."Enhanced electrochemical performance in an aluminium doped delta-MnO2 supercapacitor cathode: experimental and theoretical investigations".CHEMICAL COMMUNICATIONS 58(2021):589-592.