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Electrocatalytic performances of oxygen-deficient titanium dioxide nanosheet coupled palladium nanoparticles for oxygen reduction and hydrogen evolution reactions
Affiliation:1. Department of Applied Chemistry, Yuncheng University, Yuncheng 044000, PR China;2. Science Experiment Center, Yuncheng University, Yuncheng 044000, PR China;3. State Key Laboratory of Explosion Science and Technology, School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, PR China;1. Department of Mechanical Engineering, King Abdulaziz University, P.O. Box 80204, Jeddah 21589, Saudi Arabia;2. Department of Mechanical Engineering, Faculty of Engineering-Rabigh, King Abdulaziz University, Jeddah 21589, Saudi Arabia;3. Center of Excellence in Desalination Technology, King Abdulaziz University, P.O. Box 80200, Jeddah 21589, Saudi Arabia;4. Institute on Membrane Technology (CNR-ITM), via P. Bucci 17/C, 87036 Rende (CS) Italy;5. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China;1. Department of Mechanical, Mechatronics and Manufacturing Engineering, University of Engineering and Technology Lahore, Faisalabad, Pakistan;2. Department of Mechatronics and Control Engineering, University of Engineering and Technology Lahore, Pakistan;3. U.S. Pakistan Centre for Advanced Studies in Energy, National University of Sciences and Technology, Islamabad, Pakistan;4. School of Industrial Engineering, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile;5. Stokes Laboratories and Bernal Institute, School of Engineering, University of Limerick, Limerick, Ireland;1. Renewable Energy Research Centre, National Institute of Advanced Industrial Science and Technology, 2-2-9 Machiikedai, Koriyama, Fukushima, 963-0298, Japan;2. Waseda Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan;3. Department of Chemical Science and Engineering, National Institute of Technology, Tokyo College, 1220-2 Kunugida, Hachioji, Tokyo, 193-0997, Japan;4. Department of Applied Chemistry, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan;1. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China;2. School of Petrochemical Engineering & Environment, Zhejiang Ocean University, Zhoushan 316022, China
Abstract:The development of multifunctional electrocatalysts is crucial for enhancing the efficiency of electrochemical conversion in energy devices. Here we have synthesized TiO2-x nanosheets (NSs) supported metallic Pd nanoparticles (Pd/TiO2-x NSs) as an electrocatalyst using a simple impregnation process. High electrochemical surface areas (ECSAs) and strong metal support interactions (SMSI) of the electrocatalyst showed improved ORR performance throughout a wide pH range under ambient conditions. The outstanding durability of the catalyst was proven by the square-wave potential cycling experiment at 60 °C. Additionally, it was shown that Pd/TiO2-x NSs showed improved HER activity and stability in 0.5 M H2SO4. The catalyst had an overpotential of 19.5 mV for the 10 mA cm−2 and a low Tafel slope of 41 mV dec−1. The catalyst also showed higher stability for about 30 h in HER performance. This work will help in rationally building nanostructured electrocatalysts loaded on carbon-free support for efficient electrochemical energy storage devices.
Keywords:Bifunctional catalyst  Palladium nanoparticle  Oxygen reduction reaction  Hydrogen evolution reaction
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