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Cu2SnS3 nanocrystals decorated rGO nanosheets towards efficient and stable hydrogen evolution reaction in both acid and alkaline solutions
Materials Today Energy ( IF 9.3 ) Pub Date : 2020-05-18 , DOI: 10.1016/j.mtener.2020.100435
Jun Xu , Rixin Wang , Xing Chen , Ru Zhou , Junjun Zhang

Copper-containing bimetallic sulfides are regarded as an emerging low-cost catalyst for electrocatalytic hydrogen generation. In this work, we report for the first time the ternary Cu2SnS3 (CTS) nanocrystals anchored reduced graphene oxide (rGO) nanosheets (CTS@rGO) as a superior electrocatalyst for efficient hydrogen generation. The CTS nanocrystals with 5–10 nm are much homogeneously distributed on the surface of rGO nanosheets. In the CTS@rGO composite, the rGO works as a robust scaffold that can effectively suppress aggregation of the CTS nanocrystals and ensure more exposed active sites on CTS surfaces. Furthermore, the conductive rGO is beneficial to fast charge transfer. Therefore, the CTS@rGO catalyst possesses a large electrocatalytic active surface area and a small charge transfer resistance. As a result, the CTS@rGO exhibits significantly enhanced catalytic activity for hydrogen evolution reaction (HER) in both the acid and alkaline electrolytes in comparison with the pristine CTS nanocrystals. The CTS@rGO delivers a striking catalytic kinetic metrics of a small Tafel slope of 54 mV dec−1, a low overpotential of 252 mV at a current density of 10 mA cm−2, long operation stability of 4 day in the acid electrolyte.



中文翻译:

Cu 2 SnS 3纳米晶体装饰了rGO纳米片,以在酸性和碱性溶液中均有效且稳定地发生氢气分解反应

含铜的双金属硫化物被认为是用于电催化制氢的新兴低成本催化剂。在这项工作中,我们首次报告了三元Cu 2 SnS 3(CTS)纳米晶体锚定了还原型氧化石墨烯(rGO)纳米片(CTS @ rGO),是高效产生氢气的优良电催化剂。5-10 nm的CTS纳米晶体均匀地分布在rGO纳米片的表面上。在CTS @ rGO复合材料中,rGO可以用作坚固的支架,可以有效抑制CTS纳米晶体的聚集并确保CTS表面上更多暴露的活性位点。此外,导电rGO有利于快速电荷转移。因此,CTS @ rGO催化剂具有较大的电催化活性表面积和较小的电荷转移阻力。结果,与原始的CTS纳米晶体相比,CTS @ rGO在酸性和碱性电解质中均表现出显着增强的氢释放反应(HER)催化活性。-1,在10 mA cm -2的电流密度下的低过电势为252 mV,在酸性电解液中具有4天的长时间运行稳定性。

更新日期:2020-05-18
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