Ultrathin MoS2 nanosheets in situ grown on rich defective Ni0.96S as heterojunction bifunctional electrocatalysts for alkaline water electrolysis |
| |
| Affiliation: | 1. Institute of Functional Polymer Composites, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, PR China;2. Henan Engineering Research Center of Resource & Energy Recovery from Waste, Henan University, Kaifeng 475004, PR China;1. Department of Chemistry, School of Science, Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin 300072, China;2. School of Chemical Engineering and Technology, Xi''an Jiaotong University, Xi''an, Shaanxi 710049, China;1. Department of Mining, Metallurgical and Materials Engineering, Laval University, Québec, G1V 0A6, Canada;2. Hydro-Québec Research Centre (LTE), Shawinigan, QC, G9N 7N5, Canada;1. National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science and Technology, Xi''an, 710021, Shaanxi, China;2. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, China;1. Department of Chemistry, College of Science, University of Hafr Al Batin, P.O Box 1803, Hafr Al Batin, 39524, Saudi Arabia;2. Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, PR China;3. Renewable Energy Research Center, Fukushima Renewable Energy Institute, National Institute of Advanced Industrial Science and Technology, AIST, 2-2-9 Machiikedai, Koriyama, Fukushima 963-0298, Japan;4. Department of Chemistry, University of Agriculture Faisalabad, 38040, Faisalabad, Pakistan;5. Collaborative Innovation Center of Biomass Energy, Henan Agricultural University, Zhengzhou 450002, China;6. School of Chemistry and Environment, South China Normal University, Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, 510006, PR China |
| |
| Abstract: | Developing earth-abundant and highly active bifunctional electrocatalysts are critical to advance sustainable hydrogen production via alkaline water electrolysis but still challenging. Herein, heterojunction hybrid of ultrathin molybdenum disulfide (MoS2) nanosheets and non-stoichiometric nickel sulfide (Ni0.96S) is in situ prepared via a facile one-step hydrothermal strategy, followed by annealing at 400 °C for 1 h. Microstructural analysis shows that the hybrid is composed of intimate heterojunction interfaces between Ni0.96S and MoS2 with exposed active edges provided by ultrathin MoS2 nanosheets and rich defects provided by non-stoichiometric Ni0.96S nanocrystals. As expected, it is evaluated as bifunctional electrocatalysts to produce both hydrogen and oxygen via water electrolysis with a hydrogen evolution reaction (HER) overpotential of 104 mV at 10 mA cm?2 and an oxygen evolution reaction (OER) overpotential of 266 mV at 20 mA cm?2 under alkaline conditions, outperforming most current noble-metal-free electrocatalysts. This work provides a simple strategy toward the rational design of novel heterojunction electrocatalysts which would be a promising candidate for electrochemical overall water splitting. |
| |
| Keywords: | Heterojunction Hybrid Bifunctional electrocatalyst Alkaline water electrolysis |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
