Mn–Co–S–Se Nanowires for Energy Storage and Conversion
Zhouhao Fu, Hanwei He, Shimeng Chen, Yaru Wang, Ming Ma, Meitong Ye
Abstract
A facile hydrothermal method is used to simultaneously introduce S2– and Se2– in Mn–Co precursor to fabricate a novel quaternary metal sulfur selenide electrode. Mn–Co–S–Se electrodes exhibit excellent electrical and electrocatalytic properties for supercapacitors and electrocatalysts. Mn–Co–S–Se delivers high specific capacitance of 2509 F g–1 (corresponding to 278 mAh g–1) and excellent cycling performance with capacitance only decreasing 9% after 5000 cycles. The Mn–Co–S–Se electrode is also utilized as electrocatalysts for hydrogen evolution reaction, which exhibits a low overpotential of 126 mV at 10 mA cm–2. These results are attributed to rich redox reaction, special nanostructure, and high electrical conductivity achieved by coeffect of S2– and Se2–. The method used in this work can also be applied to fabricating other quaternary metal dichalcogenides materials. These results demonstrate the potential of Mn–Co–S–Se nanowire electrodes for application in energy storage and conversion.