Carbon encapsulated mixed-metal sulfide as proficient electrocatalyst for hydrogen evolution reaction
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Proficient electrocatalyst for hydrogen evolution reaction (HER) synthesized via a single-step, simple and low-temperature pyrolysis method. The mixed metal sulfide catalyst Co9S8/NiS@C shows irregular multi-shaped structure having small pores covered with carbon layers. The as-prepared Co9S8/NiS@C composites are made up of very small intermingled nanoparticles. The tiny nanoparticle contains large surface area that serves as an active-site for excellent HER performances. The Co9S8/NiS@C electrode is tested under alkaline solution performs overpotential (vs. RHE) of 0.28 V at current density of 10 mA cm−2. It exhibits a low Rct with an excellent and continuous stability for 10 h. The excellent HER performances of Co9S8/NiS@C are attributed to shape, size, and crystal structure of mixed metal sulfide and small surface pores that provide abundant active sites for electrocatalysis reaction.
This work was supported by the National Natural Science Foundation of China (51572111, 11774136, 51604049), Natural Science Foundation of Jiangsu Province (Grant No. BK20161347), the Six Talent Peaks Project (TD-XCL-004), the 333 Talents project (BRA2017387), the Innovation/Entrepreneurship Program (26) and the Qing Lan Project (15) of Jiangsu Province.
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