NiWO3 Nanoparticles Grown on Graphitic Carbon Nitride (g‐C3N4) Supported Toray Carbon as an Efficient Bifunctional Electrocatalyst for Oxygen and Hydrogen Evolution Reactions |
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| Authors: | M Praveen Kumar Pramila Murugesan Sankar Vivek Subbiah Ravichandran |
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| Affiliation: | 1. CSIR‐Central Electrochemical Research Institute (CSIR‐CECRI), Karaikudi, India;2. National Institute of Technology (NIT), Tiruchirappalli, India |
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| Abstract: | Catalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) are at the heart of water oxidation reactions. Despite continuous efforts, the development of OER/HER electrocatalysts with high activity at low cost remains a big challenge. Herein, a composite material consisting of TC@WO3@g‐C3N4@Ni‐NiO complex matrix as a bifunctional electrocatalyst for the OER and HER is described. Though the catalyst has modest activity for HER, it exhibits high OER activity thereby making it a better nonprecious electrocatalyst for both OER and HER and is further improved by g‐C3N4. The catalytic activity arises from the synergetic effects between WO3, Ni‐NiO, and g‐C3N4. A Ni‐NiO alloy and WO3 nanoparticles decorated on the g‐C3N4 surface supported toray carbon (TC) matrix (TC@WO3@g‐C3N4@Ni‐NiO) by a facile route that show an excellent and durable bifunctional catalytic activity for OER and HER in the alkaline medium are developed. This carbon nitride with binary metal/metal‐oxide matrix supported with TC exhibit an overpotential of 0.385 and 0.535 V versus RHE at a current density of 10 mA cm?2 (Tafel slopes of 0.057 and 0.246 V dec?1 for OER and HER, respectively), in 0.1 m NaOH . The catalyst is tested in water electrolysis for 17 h. |
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| Keywords: | bifunctional catalysts graphitic carbon nitrate hydrogen evolution reaction (HER) nickel‐nickel oxide and tungsten oxides oxygen evolution reaction (OER) water splitting |
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