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Regulating Fast Anionic Redox for High‐Voltage Aqueous Hydrogen‐Ion‐based Energy Storage
Author(s) -
Wang Shengping,
Zhao Xiaoli,
Yan Xiaojun,
Xiao Ziwei,
Liu Congcong,
Zhang Yijie,
Yang Xiaowei
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201811220
Subject(s) - electrolyte , redox , anode , energy storage , hydrogen storage , materials science , oxide , ion , hydrogen , cathode , graphene , inorganic chemistry , chemistry , electrode , nanotechnology , thermodynamics , power (physics) , physics , organic chemistry , metallurgy
The ionic conductivity and small size of the hydrogen ion make it an ideal charge carrier for hydrogen‐ion energy storage (HES); however, high‐voltage two‐electrode configurations are difficult to construct as the result of the lack of efficient cathodic energy storage. Herein, the high potential fast anionic redox at the cathode of reduced graphene oxide (rGO) was applied by introducing redox additive electrolytes. By coupling the storing hydrogen ion in the Ti 3 C 2 T x at the anode, a HES with a voltage of 1.8 V and a plateau voltage at 1.2 V was constructed. Compared with 2.2 Wh kg −1 for the low‐voltage Ti 3 C 2 T x //Ti 3 C 2 T x , the specific energy of asymmetric rGO//Ti 3 C 2 T x reaches 34.4 Wh kg −1 . Furthermore, it possesses an energy density of 23.7 Wh kg −1 at high power density of 22.5 kW kg −1 . Thus, this study provides a novel guideline for constructing high‐voltage fast HES full cells.