Designing Quinone‐Based Anodes with Rapid Kinetics for Rechargeable Proton Batteries. Issue 39 (19th August 2022)

• Record Type: Journal Article
• Authors: Yang, Xinru; Ni, Youxuan; Lu, Yong; Zhang, Qiu; Hou, Jinze; Yang, Gaojing; Liu, Xiaomeng; Xie, Weiwei; Yan, Zhenhua; Zhao, Qing; Chen, Jun
• Is Part Of: Angewandte Chemie international edition. Volume 61:Issue 39(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-08-19
• Subjects: Aqueous Battery -- Crystal Structure Evolution -- Diffusion -- Kinetics -- Proton; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202209642
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Quinone compounds, which are capable of accommodating proton (H + ), are emerging electrodes in aqueous batteries. However, the storage mechanism of proton in quinone compounds is less known and the energy/power density of quinone‐based proton battery is still limited. Here we design a series of quinone anodes and study their electrochemical properties in acidic electrolyte, in which tetramethylquinone (TMBQ) delivers a high capacity of 300 mAh g −1 with an extremely low polarization of 20 mV at 1 C, and maintains over 50 % theoretical capacity in less than 16 seconds. The fast kinetics of TMBQ is attributed to the continuous H + migration channel, high H + diffusion coefficient (10 −6 cm 2 s −1 ), and low H + migration energy barrier (0.26 eV). When coupling with MnO2 cathode, the battery shows a long lifespan of 4000 cycles with a capacity retention of 77 % at 5 C. This study reveals the proton transport in quinone‐electrodes and offers new insights to design advanced aqueous batteries. Abstract : The tetramethylquinone (TMBQ) anode in acidic electrolyte exhibits high‐rate capability (releases/stores 50 % theoretical capacity in 16 seconds) and fast kinetics, benefiting from continuous H + migration channel, high proton diffusion coefficient (10 −6 cm 2 s −1 ) and low proton migration barrier of 0.26 eV. When coupling with MnO2 cathode, the aqueous proton battery shows high power density of 20 000 W kg −1 and long cycle life of 4000 cycles.