Mott-Schottky heterojunction formation between Co and MoSe2 on carbon nanotubes for superior hydrogen evolution

IF 5.7 3区材料科学 Q2 Materials Science New Carbon Materials Pub Date : 2023-12-01 DOI:10.1016/S1872-5805(23)60782-6

Xian-pei Ren , Qi-wei Hu , Fang Ling , Fei Wu , Qiang Li , Liu-qing Pang

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Abstract

Molybdenum selenide (MoSe₂) has been regarded as an advanced electrocatalyst for the hydrogen evolution reaction (HER). However, its electrocatalytic performance is far inferior to platinum (Pt). Combining semiconductors with metals to construct Mott-Schottky heterojunctions has been considered as an effective method to enhance HER activity. In this work, we report a typical Mott-Schottky heterojunction composed of metal Co and semiconductor MoSe₂ on carbon nanotubes (Co/MoSe₂@CNT), prepared by a sol-gel process followed by thermal reduction. The characterization and theoretical calculations show that a Co/MoSe₂ Mott-Schottky heterojunction can cause electron redistribution at the interface and form a built-in electric field, which not only optimizes the free energy of hydrogen atom adsorption, but also improves the charge transfer efficiency during hydrogen evolution. Thus, the Co/MoSe₂@CNT has excellent catalytic activity with a low overpotential of 185 mV at 10 mA cm⁻² and a small Tafel slope of 69 mV dec⁻¹. This work provides a new strategy for constructing Co/MoSe₂ Mott-Schottky heterojunctions and highlights the Mott-Schottky effect, which may inspire the future development of more attractive Mott-Schottky electrocatalysts for H₂ production.

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碳纳米管上的钴和 MoSe2 之间形成的莫特-肖特基异质结实现卓越的氢气进化

硒化钼（MoSe2）一直被认为是一种先进的氢进化反应（HER）电催化剂。然而，它的电催化性能远不如铂（Pt）。将半导体与金属结合起来构建莫特-肖特基异质结被认为是提高氢进化反应活性的有效方法。在这项工作中，我们报告了一种典型的莫特-肖特基异质结，它由碳纳米管上的金属 Co 和半导体 MoSe2（Co/MoSe2@CNT）组成，采用溶胶-凝胶工艺制备，然后进行热还原。表征和理论计算表明，Co/MoSe2 Mott-Schottky 异质结能使电子在界面上重新分布并形成内置电场，这不仅优化了氢原子吸附的自由能，还提高了氢演化过程中的电荷转移效率。因此，Co/MoSe2@CNT 具有优异的催化活性，在 10 mA cm-2 时过电位低至 185 mV，塔菲尔斜率小至 69 mV dec-1。这项工作为构建 Co/MoSe2 Mott-Schottky 异质结提供了一种新策略，并突出了 Mott-Schottky 效应，这可能会启发未来开发更具吸引力的 Mott-Schottky 电催化剂来生产 H2。

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来源期刊

New Carbon Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

6.10

自引率

8.80%

发文量

3245

审稿时长

5.5 months

期刊介绍： New Carbon Materials is a scholarly journal that publishes original research papers focusing on the physics, chemistry, and technology of organic substances that serve as precursors for creating carbonaceous solids with aromatic or tetrahedral bonding. The scope of materials covered by the journal extends from diamond and graphite to a variety of forms including chars, semicokes, mesophase substances, carbons, carbon fibers, carbynes, fullerenes, and carbon nanotubes. The journal's objective is to showcase the latest research findings and advancements in the areas of formation, structure, properties, behaviors, and technological applications of carbon materials. Additionally, the journal includes papers on the secondary production of new carbon and composite materials, such as carbon-carbon composites, derived from the aforementioned carbons. Research papers on organic substances will be considered for publication only if they have a direct relevance to the resulting carbon materials.