过电位
塔菲尔方程
煅烧
无定形固体
异质结
材料科学
催化作用
化学工程
氢
化学
无机化学
电化学
电极
物理化学
结晶学
光电子学
有机化学
工程类
作者
Yang Xu,Jun Cheng,Liwei Ding,Hongkun Lv,Kang Zhang,Annan Hu,Xiàn Yáng
标识
DOI:10.1016/j.cej.2023.144344
摘要
Designing efficient and stable non-precious metal catalysts with heterogeneous structures for electrolytic hydrogen evolution in alkaline media is a challenging topic. Cactus-like amorphous MoS2-CoFeLDO heterostructures derived from calcination of MoS2-CoFeLDH in argon markedly reduced overpotential of hydrogen evolution reaction (HER). The HER overpotential of MoS2-CoFeLDO@400 °C in 1 M KOH solution required only 36 mV to reach a current density of 10 mA/cm2 and remained highly active for ≥24 h. Finite element simulations showed that cactus-like tip generated higher charge intensity, then aggregated electrons induced a higher electric field for local H+ enrichment. XRD and TEM analyses confirmed amorphous MoS2 with abundant hydrogen evolution sites in MoS2-CoFeLDO@400 °C. DFT calculations demonstrated that MoS2-CoO had a 0.5 eV lower reaction energy barrier than MoS2-CoFeLDH in the Tafel step, indicating superior reaction kinetics to promote HER.
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