电催化剂
钼
纳米颗粒
硅化物
材料科学
氢
化学工程
化学
无机化学
纳米技术
冶金
电化学
硅
电极
物理化学
有机化学
工程类
作者
Yanyan Su,Yusheng Xie,Haoran Qin,Zixun Huang,Qiaofei Yin,Zhi-Wang Li,Rongbin Zhang,Zepeng Zhao,Fengchi Wu,Gang Ou
标识
DOI:10.1016/j.ijhydene.2022.06.218
摘要
Molybdenum silicides are promising electrocatalysts for hydrogen evolution in acidic environment due to their dual characteristics of metal and ceramics as well as high electrical conductivity and acid resistance. At present, most of the transition metal silicides were synthesized at high temperature, resulting in large particle size and small specific surface area, which seriously limits their electrocatalytic applications. Herein, we report a low temperature strategy for the synthesis of ultrafine Mo 5 Si 3 and MoSi 2 nanoparticles with diameter of ∼5 nm by molten salt method. Results show that both of them demonstrated excellent electrocatalytic hydrogen evolution activity and stability in 0.5 M H 2 SO 4 solution, in which the overpotentials of Mo 5 Si 3 and MoSi 2 nanoparticles at 10 mA cm −2 are 80 mV and 94 mV, respectively. This general strategy may light up the preparation of ultrafine transition metal silicides nanoparticles and facilitate their applications in electrocatalytic areas. • Ultrafine Mo 5 Si 3 and MoSi 2 nanoparticles with diameter of ∼5 nm were synthesized by molten salt reduction method. • The nanoparticles demonstrate large specific surface area and fully exposed electrocatalytic active sites. • Mo 5 Si 3 show electrocatalytic HER activity in 0.5 M H 2 SO 4 with potential of −80 mV (η10) and Tafel slope of 65.1 mV dec −1 . • MoSi 2 show electrocatalytic HER activity in 0.5 M H 2 SO 4 with potential of −94 mV (η10) and Tafel slope of 71.2 mV dec −1 . • Mo 5 Si 3 and MoSi 2 reveal outstanding electrochemical stability for 6000 cycles of CV and 15 h of chronopotentiometry test.
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