Sulfuration of hierarchical Mn-doped NiCo LDH heterostructures as efficient electrocatalyst for overall water splitting |
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| Affiliation: | 1. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;2. Institute for Energy Research, Jiangsu University, ZhenJiang 212013, China;1. Faculty of Polymer Science, Iran Polymer and Petrochemical Institute, P.O. Box 14965/115, Tehran, Iran;2. Department of Mechanical Engineering and Materials, Universidad de Seville, P.O. Box 159163-4311, Seville, Spain;1. Engineering Research Center of Ministry of Education for Fine Chemicals, Shanxi University, Taiyuan 030006, China;2. School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China;1. College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, PR China;2. College of Materials Science and Engineering, Qiqihar University, Qiqihar 161006, PR China;3. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, PR China;1. Functional Materials and Components R&D Group, Korea Institute of Industrial Technology, Gangneung 25440, Republic of Korea;2. Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea;3. Research & Development Team, Korea Zinc Company, Ulsan 44997, Republic of Korea;4. Department of Chemistry – Ångström Laboratory, Uppsala University, Box 538, 751 21 Uppsala, Sweden;1. Key Laboratory for Nonferrous Materials (MOE), School of Materials Science and Engineering, Central South University, Changsha, 410083, China;2. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621900, China;1. Federal State Institution «Federal Research Centre «Fundamentals of Biotechnology» of the Russian Academy of Sciences» Leninsky Prospect, 33, Building 2, 119071, Moscow, Russian Federation;2. Federal Government Budgetary Institution of Science. “Federal Scientific Agroengeneering Centre VIM”, 1st Institutskiy Proezd, Building 5, 109428, Moscow, Russian Federation;3. Russian University of Transport, 127994, St. Obraztsova, 9, Bldg. 9, Moscow, Russia |
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| Abstract: | Constructing efficient bifunctional electrocatalysts for both cathode and anode is of great importance for obtaining green hydrogen by water splitting. Herein, sulfuration of hierarchical Mn-doped NiCo LDH heterostructures (Mn–NiCoS2/NF) is constructed as a bifunctional electrocatalyst for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) via a facile hydrothermal-annealing strategy. Mn–NiCoS2/NF shows an overpotential of 310 mV at 50 mA cm−2 for OER and 100 mV at 10 mA cm−2 for HER in 1.0 M KOH. Moreover, only 1.496 V@10 mA cm−2 is required for overall water splitting by using Mn–NiCoS2/NF as catalyst dual electrodes in a two-electrode system. The excellent performance of Mn–NiCoS2/NF should be attributed to the ameliorative energy barriers of adsorption/desorption for HO−/H2O through the modification of electronic structure of NiCo basal plane by Mn-doping and the acceleration of water dissociation steps via rich delocalized electron inside sulfur vacancies. The construction of hierarchical Mn–NiCoS2/NF heterostructures provides new prospects and visions into developing efficient-advanced electrocatalysts for overall water splitting. |
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| Keywords: | Mn-doping Sulfuration Bifunctional catalysts Overall water splitting |
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