【摘要】 含氮污染物的排放导致全球水中硝酸盐的累积，造成了许多生态环境问题。电催化硝酸盐还原是一种非常有潜力的解决方法，合成高效的催化剂来还原硝酸盐成为近期的研究热点。本文设计合成了CuPdO_x纳米材料作为硝酸盐还原电催化剂，借助扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射仪（XRD）、X射线光电子能谱（XPS）和电化学技术等表征了CuPdO_x的微观形貌、结构及电催化性能。结果表明，制备的CuPdO_x纳米材料在给定电压下，其NO^-₃的转化率和NH⁺₄的产率分别达到92.76%和780μg·h^-1 ·mg^-1,且具有良好的电催化循环稳定性。催化剂有效的硝酸盐还原性能得益于CuPdO_x纳米材料中Cu和Pd的协同作用，以及富含的氧缺陷作为活性位点对N-O键的消弱。更多还原

【Abstract】 The discharge of nitrogen-containing pollutants leads to the accumulation of nitrate in water all over the world, causing many ecological and environmental problems. Electrocatalytic nitrate reduction is an attractive approach. Synthesis of efficient electrocatalysts to reduce nitrate has become a research focus. In this paper, CuPdO_x nanomaterials were designed and synthesized as electrocatalysts for nitrate reduction. Scanning electron microscopy（SEM）, transmission electron microscopy（TEM）, X-ray diffraction（XRD）, X-ray photoelectron spectroscopy（XPS） and electrochemical techniques were used to characterize the nanostructures and electrocatalytic properties of the nanomaterials. The characterization and test result show that CuPdO_x nanomaterials were successfully prepared. Under a given voltage, the conversion and the ammonia yield reached 92.76% and 780 μg· h^-1·mg^-1, respectively. In addition, CuPdO_x has a good cyclic stability. Effective nitrate reduction performance was attributed to the synergistic effect of Cu and Pd metals in CuPdO_x as well as the high concentration of oxygen vacancies, which can bind to oxygen atoms in nitrate and weaken the N-O bond, thus facilitating catalytic reactions.更多还原