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Bifunctional electro-catalytic performances of CoWO4 nanocubes for water redox reactions (OER/ORR)

机译：CoWO 4 纳米立方体对水氧化还原反应的双功能电催化性能（OER / ORR）

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摘要

In this paper, we report the synthesis of cube shaped nanoparticles of CoWO4 (～30 nm) by molten salts and their bifunctional electro-catalytic activities in water redox reactions for oxygen evolution and oxygen reduction reactions (OER and ORR). Bifunctional performances of CoWO4 nano-cubes are explored for water electrolysis in an alkaline medium (1.0 M KOH) vs. reversible hydrogen electrode (RHE) under various atmospheres (N2, air and O2). Low overpotential (η10 = 0.45 V) of CoWO4 nano-cubes is accomplished at the current density of 10 mA cm?2. Tafel polarization curves (potential vs. log current density) reveal relatively lower slope values for OER (～82 mV dec?1) and ORR (～68 mV dec?1) compared to previous reports. Stability test of electrode materials has been performed using chrono-amperometry (CA) at fixed potential for 500 seconds. Kinetics and mobility of electrons have also been studied during the water redox reactions. Stable nature and enhanced bifunctional electro-catalytic performances of earth abundant CoWO4 electrodes could be used as the replacement of expensive electroactive noble electrode materials (Pt, Ir, Ru etc.) for water electrolysis (OER and ORR) in near future.
机译：本文报道了熔融盐合成CoWO 4 （〜30 nm）的立方体状纳米颗粒及其在水氧还原反应中对氧的双功能电催化活性。析出和氧还原反应（OER和ORR）。探索了CoWO 4 纳米立方体在碱性介质（1.0 M KOH）vs。可逆氢电极（RHE）中用于水电解的双功能性能。 ）在各种气氛下（N 2 ，空气和O 2 ）进行操作。 CoWO 4 纳米立方体的低超电势（η 10 = 0.45 V）在10 mA cm ？2 的电流密度下完成。 Tafel极化曲线（潜在的 vs。对数电流密度）显示了OER（〜82 mV dec ？1 ）和ORR（相对较低的斜率值）与以前的报告相比，大约为68 mV dec ？1 ）。电极材料的稳定性测试已使用计时电流法（CA）在固定电势下进行了500秒。在水氧化还原反应过程中，还研究了电子的动力学和迁移率。富含土的CoWO 4 电极的稳定性质和增强的双功能电催化性能可用来代替昂贵的电活性贵金属电极材料（Pt，Ir，Ru 等）用于水电解（OER和ORR）。

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