方雅涵,涂牧东,郝天致,黄俊峰,张 杰,李 华*,彭 勇*


方雅涵,涂牧东,郝天致,黄俊峰,张 杰,李 华*,彭 勇*

  1. 兰州大学材料与能源学院兰州大学电镜中心,磁学与磁性材料教育部重点实验室,甘肃兰州730000;2.兰州大学化学化工学院,甘肃兰州730000)

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CuPdOX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CuPdOX的微观形貌、结构及电催化性能。结果表明,制备的CuPdOX纳米材料在给定电压下,其NO3-的转化率和NH4+的产率分别达到92.76%和780 μg 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CuPdOX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。

关键词   纳米颗粒;电镜;电催化;硝酸盐还原

中图分类号:O643.3;TG115.21+5.3    文献标识码:A    doi:10.3969/j.issn.1000-6281.2023.06.005


Synthesis and electrocatalytic nitrate reduction performance of CuPdOx nanomaterials

FANG Ya-han1,TU Mu-dong1,HAO Tian-zhi2,HUANG Jun-feng2,ZHANG Jie1,LI Hua*12,PENG Yong*1

  1. School of Materials and Energy, Electron Microscopy Centre of Lanzhou University and Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou Gansu 730000;2. College of Chemistry and Chemical Engineering of Lanzhou University,Lanzhou Gansu 730000,China)

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,CuPdOxnanomaterialswere 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 results show that CuPdOxnanomaterials 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, CuPdOxhas a good cyclic stability. Effective nitrate reduction performance was attributed to the synergistic effect of Cu and Pd metals in CuPdOx 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.

keywords   nanoparticles; electron microscope; electro-catalysis; nitrate reduction