Ag nanoparticle-loaded to MnO2 with rich oxygen vacancies and Mn3+ for the synergistically enhanced oxygen reduction reaction |
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| Affiliation: | 1. Key Laboratory of Solid State Physics and Devices Autonomous Region, School of Physics Science and Technology, Xinjiang University, Urumqi 830046, Xinjiang, PR China;2. School of Environment, Tsinghua University, Beijing 100084, PR China;1. School of Materials and Energy, Southwest University, Chongqing 400715, China;2. College of Architecture and Environment, Sichuan University, Chengdu 610065, China;3. Institute of Materials, China Academy of Engineering Physics, P.O. Box 9071, Mianyang 621907, China;1. School of Energy and Power Engineering, Northeast Electric Power University, Jilin, 132012, China;2. School of Electrical Engineering, Northeast Electric Power University, Jilin, 132012, China;3. Key Laboratory of Bionic Engineering (Ministry of Education), College of Biological and Agricultural Engineering, Jilin University, Changchun, Jilin, 130022, China;1. Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, Wuhan, China;2. New Materials and Green Manufacturing Talent Introduction and Innovation Demonstration Base, Hubei University of Technology, Wuhan 430068, Hubei, China;3. Hubei Longzhong Laboratory, Xiangyang 441000, Hubei, China;4. Mads Clausen Institute, NanoSYD, University of Southern Denmark, Alsion 2, DK-6400, Sønderborg, Denmark;1. School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212100, China;2. School of Economics and Management, Jiangsu University of Science and Technology, Zhenjiang 212100, China;3. School of Energy and Power Engineering, Shandong University, Jinan 250061, China;4. National Research Ogarev Mordovia State University, Saransk 430005, Russian Federation;1. Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II 132, 83040, Fisciano, SA, Italy;2. Eldor Corporation S.p.A, Via don Paolo Berra, 18, 22030, Orsenigo, CO, Italy;1. State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum, Huadong, Qingdao, 266580, China;2. Institute for Advanced Study, Shenzhen University, Shenzhen, 518060, China |
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| Abstract: | MnO2 is considered to be one of the most promising electrocatalysts for oxygen reduction reactions (ORR) in alkaline media and can be applied to various electrochemical energy conversion and storage devices. However, it is limited by the relatively slow kinetics of the cathodic electrochemical reactions. In addition, it is difficult to control the presence state of Ag during the modification of MnO2. To this end, an efficient ORR electrocatalyst of Ag nanoparticles supported by MnO2 nanorods was successfully synthesized by using NH3·H2O as a complexing agent to inhibit the Ag+ intercalating into the tunnels of MnO2. The half-wave potential (E1/2) and limiting current density (Jlim) of the obtained Ag/MnO2 electrocatalysts are 0.81 V and ?5.6 mA cm?2, respectively, showing comparable ORR catalytic activity to commercial Pt/C catalysts. The excellent catalytic performances can be attributed to the presence of abundant oxygen vacancies and Mn3+ species on the MnO2 surface, as well as the synergistic effect between MnO2 substrates and Ag nanoparticles. Among them, oxygen vacancies enhances the adsorption of O2, Mn3+ facilitates the displacement of O22?/OH?, MnO2 inhibits the accumulation of peroxide species to improving the oxygen environment on the Ag surface and Ag accelerates the electron transfer in the whole process. This work provides a useful guide for the design of efficient Mn-based ORR electrocatalysts. |
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| Keywords: | Oxygen reduction reaction Oxygen vacancy Ag nanoparticle Synergetic catalytic effect |
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