title: Water-soluble inorganic salt with ultrahigh specific capacitance: Ce(NO3)3 can be designed as excellent pseudocapacitor electrode.
abstract: The improvement of the performance of pseudocapacitors has previously been limited to the synthesis of electrode materials with different structures and sizes. The water-soluble inorganic salts have not been explored their pseudocapacitance in aqueous electrolyte. Here, for the first time, we demonstrated that the ultrahigh specific capacitance of 2060 F/g can be obtained by the direct use of commercial Ce(NO3)3 as electrode materials in KOH electrolyte without any additional processing. As main capacitive charge-storage ions, Ce(3+)/Ce(4+), which undergo chemical reactions and electrochemical reactions, can deliver high practical specific capacitance that is close to its theoretical value. The results challenge the view that the synthesis of advanced electrode materials with specific structures is the important step to increase the specific capacitance of inorganic pseudocapacitors.
authors.affiliation: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
authors.forename: Kunfeng
authors.initials: K
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China. Electronic address: dongfeng@ciac.ac.cn.
authors.forename: Dongfeng
authors.initials: D
authors.lastname: Xue
keywords: Active metal cation; Ce(NO(3))(3); Inorganic salt pseudocapacitor; Supercapacitors; Ultrahigh specific capacitance