Enhanced pseudocapacitive performance of CoSnO3 through Mn2+ doping by ion-exchange method for all-printed supercapacitors.

High-performance electrode materials are required for next-generation supercapacitors to satisfy the growing request for higher energy density and cycling stability. In this work, Mn2+ ions are doped into CoSnO 3 nanocubes by facile ion-exchange method to achieve enhanced pseudocapacitive performance. The doping amount of Mn2+ ions is controlled by using different reaction times. Compared with pure CoSnO 3 , the resultant Mn2+-doped CoSnO 3 exhibits about 3-fold growth in specific capacitance (from 191 F g−1 to 564 F g−1) and significantly elevated cycling stability (from 84.1% to 104.7% in terms of capacitance retention). Furthermore, symmetric supercapacitors (SSCs) based on CoSnO 3 and Mn2+-doped CoSnO 3 with multifarious patterns are fabricated by cost-effective screen printing method. Mn2+-doped CoSnO 3 SSC shows boosted areal capacitance, enlarged energy density and better cycling stability compared with CoSnO 3 SSC, which can be series connected to power a red light emitting diode (1.9 V). These results prove the feasibility of Mn2+ doping with ion-exchange method to enhance the pseudocapacitive performance of the supercapacitor electrode materials. Image 1 • The Mn2+-doped CoSnO 3 nanocube derived from CoSnO 3 is synthesized by facile ion-exchange method. • CoSnO 3 :Mn-12 h exhibits significantly improved specific capacitance and enhanced cycling stability than that of CoSnO 3. • Screen printing technology is applied to fabricated symmetric supercapacitors. • CoSnO 3 :Mn-12 h SSC shows superior electrochemical performance to that of CoSnO 3 SSC. [ABSTRACT FROM AUTHOR]