双功能 CuO 修饰的 Bi3.84W0.16O6.24/Bi2WO6 纳米杂化物用于增强电化学析氢反应和光催化 Cr(VI) 还原性能,ACS Applied Nano Materials

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双功能 CuO 修饰的 Bi3.84W0.16O6.24/Bi2WO6 纳米杂化物用于增强电化学析氢反应和光催化 Cr(VI) 还原性能
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2023-02-14 , DOI: 10.1021/acsanm.2c05358
Veerappan Kavinkumar, Atul Verma, Kandasamy Jothivenkatachalam, Yen-Pei Fu

用于生产可再生能源和去除重金属污染物的双功能纳米杂化电催化剂/光催化剂的开发描述了一种环境可持续技术，以应对能源和环境应用中的挑战。在此，我们采用微波辅助合成开发了 CuO 修饰的 Bi _3.84 W _0.16 O _6.24 /Bi ₂ WO ₆(CuO/biphase-BW) 双功能纳米杂化物用于电化学析氢反应 (HER) 和光催化 Cr(VI) 还原应用。通过高分辨率透射电子显微镜技术分析，具有约 50 nm 的 CuO 纳米颗粒均匀分布在八面体形钨酸铋上。通过添加到反应中的铜前体的量，精心控制双相钨酸铋优化。在合成材料中，CuO _1.0 /biphase-BW 催化剂在中性介质（0.5 M Na ₂ SO ₄）中表现出优异的 HER 活性，在 10 mA/cm ²的电流密度下具有 111 mV 的相对较低的过电势，并且还表现出较低的 Tafel 斜率为 237 mV/dec。此外，CuO _1.0/biphase-BW催化剂涂层碳布在24小时内表现出良好的导电性和优异的电化学稳定性。在 CuO _1.0 /biphase-BW 催化剂上实现了 Cr(VI) 水溶液的最大光催化还原。值得一提的是，合成的电催化剂/光催化剂的巨大活性可归因于CuO与双相Bi _3.84 W _0.16 O _6.24 /Bi ₂ WO ₆的形成和电子相互作用，从而增加其表面活性位点和电荷转移。我们的工作提供了一种简便有效的方法来设计双功能纳米杂化物，以在中性介质中有效分解水并减少有毒 (Cr(VI)) 金属。

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Dual-Functional CuO-Decorated Bi3.84W0.16O6.24/Bi2WO6 Nanohybrids for Enhanced Electrochemical Hydrogen Evolution Reaction and Photocatalytic Cr(VI) Reduction Performance

The development of dual-functional nanohybrid-based electrocatalysts/photocatalysts for producing renewable energy and removing heavy metal pollutants describes an environmentally sustainable technique to address the challenges in energy and environment applications. Herein, we adopted microwave-assisted synthesis to develop CuO-decorated Bi_3.84W_0.16O_6.24/Bi₂WO₆ (CuO/biphase-BW) dual-functional nanohybrids for electrochemical hydrogen evolution reaction (HER) and photocatalytic Cr(VI) reduction applications. CuO nanoparticles with ∼50 nm were uniformly distributed on an octahedron-shaped bismuth tungstate analyzed via a high-resolution transmission electron microscope technique. Biphase bismuth tungstate optimization was meticulously controlled via the amount of copper precursor added to the reaction. Among synthesized materials, CuO_1.0/biphase-BW catalysts exhibit excellent HER activity in neutral media (0.5 M Na₂SO₄) with a relatively low overpotential of 111 mV at a current density of 10 mA/cm², and also it exhibits a lower Tafel slope of 237 mV/dec. Moreover, CuO_1.0/biphase-BW catalyst-coated carbon cloth exhibits good conductivity and excellent electrochemical stability for 24 h. Maximum photocatalytic reduction of aqueous Cr(VI) was achieved on the CuO_1.0/biphase-BW catalyst. It is worth mentioning that the tremendous activity of the synthesized electrocatalyst/photocatalyst can be ascribed to the formation and electronic interaction of CuO with biphase Bi_3.84W_0.16O_6.24/Bi₂WO₆, thus increasing its surface-active sites and charge transfer. Our work provides a facile and effective way to engineer dual-functional nanohybrids for efficient water splitting in a neutral medium and reducing toxic (Cr(VI)) metal.

更新日期：2023-02-14

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