1. College of Environmental Science and Engineering, Taiyuan University of Technology, Jinzhong 030600, China; 2. Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan 030024, China
摘要 随着社会经济发展及人类活动扩大,大气中CO2的浓度日益增加,且带来诸多环境污染问题.因此开发高效、可持续的CO2转化方法至关重要.本文基于电催化反应机理,制备了一系列CuO/CeO2纳米棒复合材料,以促进二氧化碳高选择性还原为C2H4.结果表明,经过优化后的CuO/CeO2-2 (molCeO2:molCuO= 2%)电催化剂在电流密度达到20mA/cm2时,所需电位最低(-0.99V vs. RHE),且对乙烯具有最高的选择性,在电压为-1.08V vs. RHE时,法拉第效率高达46%.此优势可能与大的表面积、更粗糙的表面以及CuO和CeO2之间的协同效应有关,有效提高了反应活性位点和电子转移效率.本研究将为设计和优化CuO基复合材料以实现CO2的高效转化提供理论指导.
Abstract：With the development of social economy and the expansion of human activities, the concentration of CO2 in the atmosphere is increasing day by day, and it brings many environmental pollution problems, hence, developing efficient and sustainable techniques for CO2 conversion is of utmost importance. Based on the electrocatalytic reaction mechanism, a series of CuO/CeO2 nanorods were fabrication for enhancing the electrochemical reduction of carbon dioxide. The optimized CuO/CeO2-2 (molCeO2:molCuO= 2%) electrocatalyst needed the potential of -0.99V vs. RHE to achieve the current density of 20mA/cm2, and displayed the highest FEC2H4 of 46 % at the potential of -1.08V vs. RHE. The decent property is attributed to large surface area, rough surface, and synergistic effect between CuO and CeO2, thereby enhancing reaction activity sites and electron transfer efficiency. The study will provide theoretical guidance for the design and optimization of CuO-based composites for efficient CO2 conversion.
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