@article{Ji2023, 
author = {Jie Ji and Jia Yao and Yongchang Xu and Houzhao Wan and Bao Zhang and Lin Lv and Jingying Li and Nengze Wang and Zhaohan Zheng and Jun Zhang and Guokun Ma and Li Tao and Hanbin Wang and Yi Wang and Hao Wang},
title = {Promoting Proton Migration Kinetics by Ni2+ Regulating Enables Improved Aqueous Zn-MnO2 Batteries},
year = {2023},
journal = {Energy & Environmental Materials},
volume = {6},
number = {2},
keywords = {doping, H+ storage, ion/electron transport, proton migration, Zinc ion battery},
url = {https://www.sciopen.com/article/10.1002/eem2.12340},
doi = {10.1002/eem2.12340},
abstract = {The energy storage behaviors of MnO2 for aqueous Zn-MnO2 batteries mainly depend on the Zn2+/H+ intercalation but are limited by poor ion/electron migration dynamics and stability. Herein, a strategy is proposed that promoting proton migration kinetics ameliorates H+ storage activity by introducing Ni2+ into γ-MnO2 (Ni-MnO2). Ni2+ can lower the diffusion barrier of H+ and selectively induce the ion intercalation, thereby alleviating the electrostatic interaction with the lattice. Moreover, Ni2+ enables the adjacent [MnO6] octahedrons to have better electron conductivity. The Ni-MnO2 exhibits superior rate performance (nearly four times specific capacity compared with MnO2) and ultra-long-cycle stability (100% of capacity retention after 11000 cycles at 3.0 A g−1). The calculation indicates that the Ni-MnO2 allows H+ migrate rapidly along the one-dimensional tunnel due to reduction of the activation energy caused by Ni2+ regulating, thus achieving excellent reaction kinetics. This work brings great potential for the development of high-performance aqueous Zn-MnO2 batteries.}
}