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Ni‐Doped MoS 2 as an Efficient Catalyst for Electrochemical Hydrogen Evolution in Alkine Media
Author(s) -
Kong Xiangbin,
Wang Ning,
Zhang Qixing,
Liang Junhui,
Wang Manjing,
Wei Changchun,
Chen Xinliang,
Zhao Ying,
Zhang Xiaodan
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201802100
Subject(s) - molybdenum disulfide , overpotential , catalysis , x ray photoelectron spectroscopy , dielectric spectroscopy , materials science , electrocatalyst , molybdenum , nanomaterials , nickel , electrochemistry , hydrogen , water splitting , chemical engineering , hydrogen production , electrolyte , electrochemical energy conversion , inorganic chemistry , nanotechnology , chemistry , electrode , metallurgy , photocatalysis , biochemistry , engineering , organic chemistry
Abstract Hydrogen generation from overall water splitting in alkine media is a convenient and promising technology for solving global energy dilemma. As a key half reaction, the hydrogen evolution reaction (HER) involves a complicated electrochemical process, and preparing high‐performance catalysts based on earth‐abundant elements is a matter of urgency. Molybdenum disulfide (MoS 2 ) is a robust electrocatalyst that has been widely studied in acidic HER, but the low‐concentration of active sites and slow‐reaction rate limit its application in alkine electrolytes. To solve the above issues, we successfully fabricated a three‐dimensional Ni doped MoS 2 (MoS 2 :Ni) catalyst by a simple two‐step approach for excellent catalytic performance. The X‐ray photoelectron spectroscopy (XPS) results suggested that the nickel acted as new active sites, and the electronic interactions between nickel and molybdenum led to the redistribution of charge to promote the involved process. Electrochemical impedance spectroscopy (EIS) results indicated that MoS 2 :Ni performed a faster charge‐transfer. In addition, the developed catalyst showed a lower overpotential and 91 mV decrease compared to those of pure MoS 2 at 10 mA/cm 2 in 1.0 M KOH. The study reported here may inspire the synthesis of advanced nanomaterials and provide concepts for improving the HER capabilities of MoS 2 ‐based catalysts.