4.7 Article

P-Doped MoSe2/MoS2 Heterojunctions Anchored on N-CNTs/Carbon Cloth with Abundant Interfaces and Defects for Effective Electrocatalytic Hydrogen Evolution

期刊

ACS APPLIED ENERGY MATERIALS
卷 4, 期 3, 页码 2408-2418

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c02922

关键词

interface engineering; MoSe2/MoS2 heterojunction; phosphate doping; defects design; hydrogen evolution

资金

  1. National Natural Science Foundation of China [21978178, 21776187]

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This study anchored spherical MoSe2/MoS2 heterojunction nanosheets on nitrogen-doped carbon nanotubes/carbon cloth struts to improve electron transfer and facilitate surface ion adsorption. Introduction of rich electron defects and vacancies through phosphorization process enhanced the activity sites of the electrocatalyst, promoting the efficiency of electrocatalytic splitting.
Low-cost, stable, and high-efficiency electrocatalysts are highly demanded for large-scale hydrogen production by industrial-scale water electrolysis. The rational interface and defects engineering of the electrodes can effectively modify the active sites and promote electron transfer, thus facilitating the electrocatalytic splitting efficiency. In this work, spherical MoSe2/MoS2 heterojunction nanosheets are in situ anchored on nitrogen-doped carbon nanotubes/carbon cloth (N-CNTs/CC) struts. The porous and highly conductive N-CNTs/CC networks can improve the electron transfer, enlarge the exposed surface area, and facilitate the surface ion adsorption. Moreover, the influence of the Se/S ratio on the structure of the composites is also investigated. Afterward, abundant electron-rich defects and vacancies are introduced by the phosphorization process. The MoSe2/MoS2 heterojunctions with abundant interface can provide synergetic interactions and electronic modulations, while the PO43- dopant can expand the interlayer spacing and provide sufficient crystalline distortions and defects. Herein, the rational designed hierarchical P-MoSe0.5S1.5/N-CNTs/CC-2 composite exhibits a low overpotential (108.3 mV) at 10 mA cm(-2), a small Tafel slope (58.6 mV dec(-1)), and excellent long-term catalytic and structural stability.

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