Copper activated near-full two-electron Mn4+/Mn2+ redox for mild aqueous Zn/MnO2 battery

Chen，Yatu1; Gu，Shuai1; Wu，Shuilin2; Ma，Xiaoxia1; Hussain，Iftikhar1; Sun，Zhipeng3; Lu，Zhouguang4; Zhang，Kaili1

2022-12-15

10.1016/j.cej.2022.137923

CHEMICAL ENGINEERING JOURNAL   Impact Factor & Quartile

1385-8947

1873-3212

Compared with traditional one-electron Mn4+/Mn3+ redox couple (308 mAh g-1), two-electron Mn4+/Mn2+ redox mechanism doubles the theoretical capacity (616 mAh g- 1) of Zn/MnO2 batteries. However, in most cases, activating the Mn4+/Mn2+ redox couple requires a low pH value, which often leads to corrosion issues. Herein, a binder-free Cu-doped epsilon-MnO2 (CMO) was synthesized through a facile electrodeposition method and the two -electron Mn4+/Mn2+ redox is achieved in near-neutral ZnSO4 electrolyte with a working potential window of 0.8-1.9 V. Detailed characterizations demonstrate that the synergistic effect between Cu and Mn can boost the further reduction of Mn4+ and Mn3+ to dissoluble Mn2+ below 1.1 V. Compared with the capacity of epsilon-MnO2 (MO, 282.4 mAh g(-1)), which mainly involves Mn4+/Mn(3+)redox couple, the CMO cathode demonstrates an improved specific capacity of 397.4 mAh g-1 at 0.2 A g(-1). Besides, the fast reaction kinetics of H+ insertion, Mn dissolution, and Mn deposition reactions endow CMO with excellent rate performance, achieving a high specific capacity of 298.9 mAh g- 1 at 5 A g- 1.

Two -electron transfer Mn (4+)/Mn2+ redox Mild electrolyte ZnMnO2 battery MnO2 battery

SCI ; EI

English

Others

Donations for Research Projects_RMGS[9229006] ; Basic Research Project of the Science and Technology Innovation Commission of Shenzhen[JCYJ20200109141640095] ; Guangdong -Hong Kong -Macao Joint Lab- oratory[2019B121205001] ; National Natural Science Foundation of China[21875097]

Engineering

Engineering, Environmental ; Engineering, Chemical

WOS:000830812900003

ELSEVIER SCIENCE SA

20222812353304

Copper ; Copper compounds ; Corrosion ; Electric batteries ; Electrodes ; Electrons ; Manganese ; Manganese oxide ; Reaction kinetics ; Zinc compounds

Manganese and Alloys:543.2 ; Copper:544.1 ; Electric Batteries and Fuel Cells:702 ; Electric Batteries:702.1 ; Chemical Reactions:802.2 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804

ENGINEERING

2-s2.0-85133784005

Web of Science

1.Department of Mechanical Engineering,City University of Hong Kong,83 Tat Chee Avenue,Hong Kong
2.Department of Materials Science and Engineering,and Center of Super-Diamond and Advanced Films,City University of Hong Kong,83 Tat Chee Avenue,Hong Kong
3.School of Materials and Energy,Guangdong University of Technology,Guangzhou,510001,China
4.Department of Materials Science and Engineering,Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China

Chen，Yatu,Gu，Shuai,Wu，Shuilin,et al. Copper activated near-full two-electron Mn4+/Mn2+ redox for mild aqueous Zn/MnO2 battery[J]. CHEMICAL ENGINEERING JOURNAL,2022,450.

Chen，Yatu.,Gu，Shuai.,Wu，Shuilin.,Ma，Xiaoxia.,Hussain，Iftikhar.,...&Zhang，Kaili.(2022).Copper activated near-full two-electron Mn4+/Mn2+ redox for mild aqueous Zn/MnO2 battery.CHEMICAL ENGINEERING JOURNAL,450.

Chen，Yatu,et al."Copper activated near-full two-electron Mn4+/Mn2+ redox for mild aqueous Zn/MnO2 battery".CHEMICAL ENGINEERING JOURNAL 450(2022).