期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 5, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202107720
关键词
high power density; proton storage; proton transport; Prussian blue analog; pseudocapacitive supercapacitor
类别
资金
- National Natural Science Foundation of China [52072173, U1802256]
- Leading Edge Technology of Jiangsu Province [BK20202008]
- Jiangsu Specially-Appointed Professors Program, Jiangsu Province Outstanding Youth Fund [BK20200016]
This study demonstrates a new multi-metallic Prussian blue analog compound capable of efficiently storing protons, and successfully fabricates an asymmetric pseudocapacitive proton supercapacitor with high energy density and cycling stability through systematic material design and mechanism study.
Electrochemical proton storage provides high energy, fast kinetics, safety, and environmental friendliness for grid-scale energy storage. However, the development of pseudocapacitive proton supercapacitors with fast chargeability and high stability is still challenging because of the unclear electrochemical reaction mechanism and unsuitable construction strategy. Here it is shown that a multi-metallic Prussian blue analog-Cu0.82Co0.18HCF, which possesses enhanced electronic structure and ion transport path-can intercalate/de-intercalate large amounts of proton at high rates. Ion-induced transformation of magnetism, fast solid-state proton transport, and reversible insertion/de-insertion of protons lead to extremely excellent rate capacities and cycling stability for proton storage. An asymmetric pseudocapacitive proton supercapacitor (Cu0.82Co0.18HCF//WO3 center dot nH(2)O) is fabricated with a voltage window of 1.7 V, delivering a maximum energy density of 35 Wh kg(-1) and an energy density of 22 Wh kg(-1) at a high power density of 26 kW kg(-1). Combining systematical material design and mechanism study, this work not only broadens the preparation of electrode materials but also brings light to the construction of high-performance devices for efficient proton storage.
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