Surface-Induced Desolvation of Hydronium Ion Enables Anatase TiO2 as an Efficient Anode for Proton Batteries

Autor:	Chao Geng, Yi-Jie Gu, Jin-Ming Wu, Hisayoshi Kobayashi, Jianhang Hai, Tulai Sun, Zhencui Wang, Peng Yang, Wei Wen
Rok vydání:	2021
Předmět:	Battery (electricity) Anatase Materials science Hydrogen Proton Mechanical Engineering chemistry.chemical_element Bioengineering General Chemistry Condensed Matter Physics Cathode law.invention Anode Ion chemistry Chemical engineering law Specific energy General Materials Science
Zdroj:	Nano Letters. 21:7021-7029
ISSN:	1530-6992 1530-6984
DOI:	10.1021/acs.nanolett.1c02421
Popis:	Hydrogen ion is an attractive charge carrier for energy storage due to its smallest radius. However, hydrogen ions usually exist in the form of hydronium ion (H3O+) because of its high dehydration energy; the choice of electrode materials is thus greatly limited to open frameworks and layered structures with large ionic channels. Here, the desolvation of H3O+ is achieved by using anatase TiO2 as anodes, enabling the H+ intercalation with a strain-free characteristic. Density functional theory calculations show that the desolvation effects are dependent on the facets of anatase TiO2. Anatase TiO2 (001) surface, a highly reactive surface, impels the desolvation of H3O+ into H+. When coupled with a MnO2 cathode, the proton battery delivers a high specific energy of 143.2 Wh/kg at an ultrahigh specific power of 47.9 kW/kg. The modulation of the interactions between ions and electrodes opens new perspectives for battery optimizations.
Databáze:	OpenAIRE
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