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Pseudocapacitance of zeolite-templated carbon in organic electrolytes

2015; Elsevier BV; Volume: 1; Linguagem: Inglês

10.1016/j.ensm.2015.08.003

2405-8297

Khanin Nueangnoraj, Hirotomo Nishihara, Takafumi Ishii, Norihisa Yamamoto, Hiroyuki Itoi, R. Berenguer, Ramiro Ruíz-Rosas, Diego Cazorla‐Amorós, Emilia Morallón, Masashi Ito, Takashi Kyotani,

Advancements in Battery Materials

Carbon and graphene-based materials often show some amount of pseudocapacitance due to their oxygen-functional groups. However, such pseudocapacitance is generally negligible in organic electrolytes and has not attracted much attention. In this work, we report a large pseudocapacitance of zeolite-templated carbon (ZTC) based on the oxygen-functional groups in 1 M tetraethylammonium tetrafluoroborate dissolved in propylene carbonate (Et4NBF4/PC). Due to its significant amount of active edge sites, a large amount of redox-active oxygen functional groups are introduced into ZTC, and ZTC shows a high specific capacitance (330 F g−1). Experimental results suggest that the pseudocapacitance could be based on the formation of anion and cation radicals of quinones and ethers, respectively. Moreover, ZTC shows pseudocapacitance also in 1 M lithium hexafluorophosphate dissolved with a mixture of ethylene carbonate and diethyl carbonate (LiPF6/EC+DEC) which is used for lithium-ion batteries and lithium-ion capacitors.