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

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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Abstract

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.

Abstract Image

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
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。
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来源期刊
CiteScore
1.80
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