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Promoting Proton Migration Kinetics by Ni2+ Regulating Enables Improved Aqueous Zn‐MnO2 Batteries.
- Source :
- Energy & Environmental Materials; Mar2023, Vol. 6 Issue 2, p1-10, 10p
- Publication Year :
- 2023
-
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 11 000 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 25750356
- Volume :
- 6
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Energy & Environmental Materials
- Publication Type :
- Academic Journal
- Accession number :
- 162435943
- Full Text :
- https://doi.org/10.1002/eem2.12340