Hydrogen evolution reaction catalyzed by microstructured SrMoO 4 decorated on three-dimensional nanostructured rGO/ f -M
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ORIGINAL PAPER
Hydrogen evolution reaction catalyzed by microstructured SrMoO4 decorated on three-dimensional nanostructured rGO/f-MWCNT in acidic medium Abdul Kareem 1 & Aruna K. Kunhiraman 2 & Thandavarayan Maiyalagan 1 Received: 7 February 2020 / Revised: 13 May 2020 / Accepted: 24 May 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Noble metals are renowned for their catalytic activity, but the gearing cost and diminishing availability hindered the large-scale production of hydrogen. Herein, we report one-pot synthesized microstructured SrMoO4 decorated on SrMoO4@rGO-MWCNT micro-nanocomposite as a capable catalyst for hydrogen evolution reaction (HER) in an acidic environment. Different compositions (20 wt%, 40 wt%, 60 wt%, and 80 wt%) of the micro-nanostructures were engineering and evaluated electrochemically for HER catalysis. Among the compositions, 40 wt% SrMoO4@rGO-MWCNT was found to be the best with and overpotential value of ā 193 mV for attaining a current density of ā 10 mA/cm2. The intrinsic activity of the electrocatalyst was evaluated based on the turnover frequency and chronoamperometric measurement. The synergistic effect of the optimal composition resulted in superior performance and has outperformed all the other combinations. The study has opened a new gateway for exploring the coupling of oxide materials with carbon nanostructures. Keywords SrMoO4 . Micro-nanostructure . Hydrogen evolution reaction . Electrocatalysis
Introduction Energy is the foremost and the prime requirement for the technological and economic growth of any nation. The shortage of fossil fuels and the high demand for clean and sustainable energy have triggered the researchers in search of efficient, clean, renewable, and sustainable alternate [1]. Hydrogen meets all criteria to be termed as a future energy carrier with zero emission of global warming gases credited with high theoretical mass-energy density (120 MJ kgā1) [2, 3]. Electrolysis of water is regarded as a promising green route for hydrogen generation [4], provided electricity can be supplied by renewable sources like wind and solar energy [5]. Abdul Kareem and Aruna K. Kunhiraman contributed equally to this work. * Thandavarayan Maiyalagan [email protected]; [email protected] 1
Electrochemical Energy Laboratory, Department of Chemistry, SRM Institute of Science and Technology, Kattankulathur 603203, India
2
Department of Science and Humanities (Physics), Sri Krishna College of Engineering and Technology, Kuniamuthur, Coimbatore 641008, India
Electrocatalysts play a central role in determining the overall efficiency and cost of the system. To date, noble metal-based catalysts with negligible overpotential and outstanding kinetics in acidic electrolytes are regarded as the benchmark for the HER; however, these materials are challenged for large-scale production of hydrogen due to its less abundance followed by the high cost. Currently, the crucial issue is to exploit and explore non-noble metal-based catalysts. Rece
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