MIIT Key Laboratory of Critical Materials Technology for New Energy, Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, 150001, P.R. China.
Chemistry. 2018 Dec 17;24(71):19075-19080. doi: 10.1002/chem.201804658. Epub 2018 Nov 16.
Molybdenum disulfide has drawn persistent interest as a promising nonprecious electrocatalyst alternative to Pt for the hydrogen evolution reaction (HER). However, the MoS catalytic efficiency is still lower than the Pt-based catalysts owing to insufficient active sites with more inert basal planes. Herein, we designed and synthesized porous MoS nanosheets to activate the basal planes by etching away Al in Al-doped MoS . The optimized porous MoS shows a small onset overpotential as low as 136 mV, a large cathode current density of 10 mA cm at η=201 mV, a low Tafel slope of 62 mV decade , and a high TOF of 0.29 H s per active site at η=200 mV. This study opens up new avenues for designing electrocatalysts based on porous MoS or other layered materials with enhanced HER performance.
二硫化钼作为一种很有前途的非贵金属析氢反应（HER）电催化剂，替代铂引起了持续的关注。然而，由于具有更多惰性基面的活性位点不足，MoS 的催化效率仍然低于基于 Pt 的催化剂。在此，我们设计并合成了多孔 MoS 纳米片，通过刻蚀掺杂 Al 的 MoS 中的 Al 来激活基面。优化后的多孔 MoS 表现出较低的起始过电势（低至 136 mV）、较大的阴极电流密度（在 η=201 mV 时为 10 mA cm）、较小的塔菲尔斜率（62 mV 每 decade）以及在 η=200 mV 时每活性位高达 0.29 H 秒的高 TOF。这项研究为设计基于多孔 MoS 或其他具有增强 HER 性能的层状材料的电催化剂开辟了新途径。
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