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Greatly boosting electrochemical hydrogen evolution reaction over Ni3S2 nanosheets rationally decorated by Ni3Sn2S2 quantum dots
Applied Catalysis B: Environment and Energy ( IF 22.1 ) Pub Date : 2020-01-23 , DOI: 10.1016/j.apcatb.2020.118675
Shi-Yu Lu , Shengwen Li , Meng Jin , Jiechang Gao , Yanning Zhang

The electrode kinetics of hydrogen evolution reaction (HER) greatly relies on both strong water absorption and strong H atom desorption for fast electron transfer while prompting hydrogen evolution, but it is very challenging to achieve due to the tough trading off between water absorption and H-desorption ability of the catalyst. Herein, a unique high-surficial multi-heteroatomic catalytic process is realized by rationally design and tailor Ni3Sn2S2 dots-decorated thin Ni3S2 nanosheets to form sheets-on-sheets array self-supported electrode by simple hydrothermal process. The formed Ni3Sn2S2@Ni3S2-2 NF delivers a superior performance very close to the noble catalyst (Pt/C) at low current densities with an onset-potential of nearly 0 mV and overpotentials of 50.7 mV at 10 mA cm-2 while surprisingly surpassing Pt/C at high current densities. The outstanding HER performance of the catalyst can be ascribed that the rationally tuned multi-heterogeneous interfaces and electronic structure control can realize both strong water absorption and strong H atom desorption to not only significantly promotes fast electron transfer, but also greatly enhances the gas release toward efficient HER. This work holds a great promise to fabricate a non-noble HER catalyst for high-performance close to the noble catalysts such as Pt/C while shedding a light on fundamentals to guide construction of high-surficial heteroatomic multi-heterogeneous catalysts with superior performance.



中文翻译:

大大提高电化学析氢反应在Ni 3 š 2个纳米片的Ni合理装饰3 Sn的2小号2个量子点

氢析出反应(HER)的电极动力学极大地依赖于强吸水率和强H原子解吸作用,以促进电子的快速转移,同时促进了氢的析出,但是由于吸水和H-催化剂的解吸能力。在此,通过合理设计和定制Ni 3 Sn 2 S 2点修饰的薄Ni 3 S 2纳米片,通过简单的水热法形成片对片阵列自支撑电极,实现了独特的高表面多杂原子催化工艺。 。形成的Ni 3 Sn 2 S 2 @Ni 3 S2 -2 NF在低电流密度下提供的性能非常接近贵金属催化剂(Pt / C),在10 mA cm -2时的起始电势接近0 mV,过电势为50.7 mV同时在高电流密度下令人惊讶地超过了Pt / C。催化剂杰出的HER性能可以归因于合理调整的多相界面和电子结构控制,可以实现强吸水和强H原子解吸,不仅显着促进了快速的电子转移,还大大增强了向高效的HER。这项工作很有希望制造出与贵金属催化剂(如Pt / C)接近的高性能非贵金属HER催化剂,同时阐明基本原理,以指导具有优异性能的高表面异质多异质催化剂的构建。

更新日期:2020-01-23
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