Porous CrN thin films by selectively etching CrCuN for symmetric supercapacitors

Binbin Wei, Gui Mei, Hanfeng Liang, Zhengbing Qi, Dongfang Zhang, Hao Shen, Zhoucheng Wang

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Transition metal nitrides are regarded as a new class of excellent electrode materials for high-performance supercapacitors due to their superior chemical stability and excellent electrical conductivity. We synthesize successfully the porous CrN thin films for binder-free supercapacitor electrodes by reactive magnetron co-sputtering and selective chemical etching. The porous CrN thin film electrodes exhibit high-capacitance performance (31.3 mF cm−2 at 1.0 mA cm−2) and reasonable cycling stability (94% retention after 20000 cycles). Moreover, the specific capacitance is more than two-fold higher than that of the CrN thin film electrodes in previous work. In addition, a symmetric supercapacitor device with a maximum energy density of 14.4 mWh cm−3 and a maximum power density of 6.6 W cm−3 is achieved. These findings demonstrate that the porous CrN thin films will have potential applications in supercapacitors.
Original languageEnglish (US)
Pages (from-to)39-44
Number of pages6
JournalJournal of Power Sources
Volume385
DOIs
StatePublished - Mar 18 2018

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