PVP Functionalized Marigold-like MoS 2 as a New Electrocatalyst for Highly Efficient Electrochemical Hydrogen Evolution
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ORIGINAL RESEARCH ARTICLES
PVP Functionalized Marigold-like MoS2 as a New Electrocatalyst for Highly Efficient Electrochemical Hydrogen Evolution Weili Wang 1,2 & Bingqing Qiu 1,2 & Chenxi Li 1,2 & Xiaqiang Shen 2 & Jing Tang 1,2 & Yi Li 2 & Guokun Liu 3
# Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Molybdenum disulfide is regarded as the inheritor of Pt-based catalysts for the hydrogen evolution reaction (HER), arising from low-cost and abundant resource. However, the electrocatalytic efficiency of MoS2 is much lower than that of Pt-based catalysts, as a result of lacking edge active sites, poor activity of basal plane, and deficient conductivity. Herein, by introducing nanoflowerlike MoS2 with PVP coating (PVP@MoS2) as catalyst, high performance for HER is observed. The higher efficiency of PVP@MoS2 is mainly due to the four points: (1) the formation of more spatial manipulated nanoflower structure by thin MoS2 slices exposing large amount of edge active sites; (2) improving basal plane atom utilization with the enlarged (002) plane from 6.2 to 6.8 Å; (3) the intrinsic conductivity of MoS2 increases, because the electron can transfer from C=O and C–N to MoS2; (4) the decreased hydrogen atom absorption energy from 0.815 to 0.684 eV extracts from DFT calculation. Therefore, the synergetic effect of the micro/nano-structure and electronic structure offers a simple, effective, and possible way for many other 2D materials to enhance their electrocatalytic HER activity. Keywords MoS2 . Hydrogen evolution reaction . Polyvinylpyrrolidone . Electrocatalysis . DFT
Introduction The electrochemical conversion of H2O into hydrogen is a very promising approach to the practical application of hydrogen fuel cell, where one key point lies in developing more Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12678-020-00594-y) contains supplementary material, which is available to authorized users. * Jing Tang [email protected] * Yi Li [email protected] * Guokun Liu [email protected] 1
Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, Ministry of Education, College of Chemistry, Fuzhou University, Fuzhou 350116, China
2
College of Chemistry, Fuzhou University, Fuzhou 350116, China
3
Key Laboratory of the Coastal and Wetland Ecosystems of Ministry of Education, Center for Marine Environmental Chemistry and Toxicology, College of the Environment and Ecology, Xiamen University, Xiamen 361102, Fujian, China
profitable, effective, and competitive catalysts instead of platinum-group metal [1–4]. To this end, great efforts have been made to this direction. Among various materials investigated, the 2D (two dimensional)-layer structured molybdenum disulfide (MoS2) attracted great attention with the close binding energy to Pt in the volcano curve [5–10]. The 2D MoS2 is composed of sandwiched S-Mo-S layers via weak van der Waals interaction between [9, 11], whe
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