在电化学二氧化碳还原过程中通过协同 2D/0D 纳米结构 VCu 层状双氢氧化物/二氧化钛催化剂提高乙烯产量

IF 3.2 Q2 CHEMISTRY, PHYSICAL Energy advances Pub Date : 2024-09-18 DOI:10.1039/D4YA00417E
Sneha S. Lavate and Rohit Srivastava
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引用次数: 0

摘要

将 CO2 电化学转化为 C1 到 C2 碳氢化合物(如甲烷和乙烯)是实现净零排放的一条很有前景的途径,但由于 CO2 的活化障碍很高,这仍然是一个巨大的挑战。在这项工作中,我们开发了一种有效的策略,即通过合成一种用二氧化钛纳米颗粒(VCu LDH/TiO2)装饰的低成本钒铜基层状双氢氧化物(LDH),作为电化学将二氧化碳还原成乙烯的高效电催化剂。借助各种分析仪器,如 X 射线衍射仪 (XRD)、傅立叶变换红外光谱 (FT-IR)、扫描电子显微镜 (FESEM)、X 射线光电子显微镜 (XPS) 和透射电子显微镜 (TEM),对所开发的电催化剂的结构和形态进行了分析,证实了 VCu LDH/TiO2 的成功形成。使用 H 型电池在 0.1 M KHCO3 中进行了电化学 CO2 还原反应(CO2RR)研究,结果表明形成了 CO、CH4 和 C2H4 等增值最终产物。在 -0.4 V vs RHE 条件下,C2H4 的最高法拉第效率为 92%。上述结果表明,VCu LDH/TiO2 NPs 电催化剂可能是二氧化碳还原的理想候选催化剂,也可广泛应用于能源转换和储存领域。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Boosting ethylene yield via a synergistic 2D/0D nanostructured VCu layered double hydroxide/TiO2 catalyst in electrochemical CO2 reduction†

The electrochemical conversion of CO2 into C1 and C2 hydrocarbons, such as methane and ethylene, is a promising pathway toward achieving net zero carbon emissions; however, owing to the high activation barrier of CO2, this reaction remains a big challenge. In this work, an effective strategy has been developed through the synthesis of a low-cost vanadium- and copper-based layered double hydroxide (LDH) decorated with TiO2 nanoparticles (VCu LDH/TiO2) as a highly efficient electrocatalyst for the electrochemical reduction of CO2 to ethylene. Structural and morphological studies of the developed electrocatalyst were carried out using various analytical techniques such as X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (FESEM), X-ray photoelectron microscopy (XPS) and transmission electron microscopy (TEM), which confirmed the successful formation of VCu LDH/TiO2. The electrochemical CO2 reduction reaction (CO2RR) was performed in 0.1 M KHCO3 using an H-type cell and afforded CO, H2, CH4, and C2H4 as value-added end products. The highest faradaic efficiency of 84% was obtained for C2H4 at −0.4 V vs. RHE. The above results suggest that the VCu LDH/TiO2 NP electrocatalyst may be an excellent candidate for CO2 reduction and can also be utilized in a wide range of energy conversion and storage applications.

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Back cover Fabrication methods, pseudocapacitance characteristics, and integration of conjugated conducting polymers in electrochemical energy storage devices Inside back cover Back cover Competing effects of low salt ratio on electrochemical performance and compressive modulus of PEO-LiTFSI/LLZTO composite electrolytes†
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