Meng Huang, Qiu He, Junjun Wang, Xiong Liu, Fangyu Xiong, Yu Liu, Ruiting Guo, Yan Zhao, Jinlong Yang, Liqiang Mai
Angewandte Chemie (International ed. in English) 2023 Mar 27Ion insertions always involve electrode-electrolyte interface process, desolvation for instance, which determines the electrochemical kinetics. However, it's still a challenge to achieve fast ion insertion and investigate ion transformation at interface. Herein, the interface deprotonation of NH4 + and the introduced dissociation of H2 O molecules to provide sufficient H3 O+ to insert into materials' structure for fast energy storages are revealed. Lewis acidic ion-NH4 + can, on one hand provide H3 O+ itself via deprotonation, and on the other hand hydrolyze with H2 O molecules to produce H3 O+ . In situ attenuated total reflection-Fourier transform infrared ray method probed the interface accumulation and deprotonation of NH4 + , and density functional theory calculations manifested that NH4 + tend to thermodynamically adsorb on the surface of monoclinic VO2 , and deprotonate to provide H3 O+ . In addition, the inserted NH4 + has a positive effect for stabilizing the VO2 (B) structure. Therefore, high specific capacity (>300 mAh g-1 ) and fast ionic insertion/extraction (<20 s) can be realized in VO2 (B) anode. This interface derivation proposes a new path for designing proton ion insertion/extraction in mild electrolyte. © 2023 Wiley-VCH GmbH.
Meng Huang, Qiu He, Junjun Wang, Xiong Liu, Fangyu Xiong, Yu Liu, Ruiting Guo, Yan Zhao, Jinlong Yang, Liqiang Mai. NH4 + Deprotonation at Interfaces Induced Reversible H3 O+ /NH4 + Co-insertion/Extraction. Angewandte Chemie (International ed. in English). 2023 Mar 27;62(14):e202218922
PMID: 36734650
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