Pd_(8)Ag_(1)/PVA电催化剂的制备及其对乙二醇的催化氧化性能  

Preparation of Pd_(8)Ag_(1)/PVA electrocatalyst and its catalytic oxidation to ethylene glycol

作　　者：赵永男[1,2] 陈江红 余建国[3,4] 王帅[3,4] 宋汝杰 ZHAO Yong-nan;CHEN Jiang-hong;YU Jian-guo;WANG Shuai;SONG Ru-jie(Tianjin Key Laboratory of Advanced Fibers and Energy Storage,Tiangong University,Tianjin 300387,China;School of Material Science and Engineering,Tiangong University,Tianjin 300387,China;School of Chemistry,Tiangong University,Tianjin 300387,China;State Key Laboratory of Separation Membranes and Membrane Processes,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津工业大学天津市先进纤维与储能技术重点实验室,天津300387 [2]天津工业大学材料科学与工程学院,天津300387 [3]天津工业大学化学学院,天津300387 [4]天津工业大学省部共建分离膜与膜过程国家重点实验室,天津300387

出　　处：《天津工业大学学报》2022年第4期55-60,共6页Journal of Tiangong University

基　　金：国家自然科学基金资助项目(21703152);吉林大学化学无机合成与制备国家重点实验室项目(17JCQNJC06100);天津市自然科学基金资助项目(18JCYBJC89100)。

摘　　要：为克服钯基催化剂由于负载量低且在碱性介质中对醇的电催化氧化的活性、稳定性以及抗中毒能力较弱等缺点,通过一步水热法合成了适用于乙二醇氧化的PdAg/PVA双金属纳米催化剂;采用透射电子显微镜(TEM)、高倍透射显微镜(HRTEM)、电化学工作站等测试手段对样品的组成结构和醇氧化性能进行分析测试。结果表明:所制备的Pd_(8)Ag_(1)纳米颗粒分布均匀,平均粒径为9 nm,其中Pd和Ag的摩尔比为8∶1的Pd_(8)Ag_(1)/PVA纳米催化剂对乙二醇(EG)的质量电流密度为5 225 m A/mg,是商业Pd/C的14.37倍;经过5 000 s计时安培测试(CA)后保留的质量电流密度为387.7 mA/mg,是商业Pd/C的24.2倍,表现出良好的稳定性。其优异的醇氧化性能源自于PdAg合金的协同作用。In order to solve the problems of palladium-based catalysts such as low loading and their weak activity, stability,and anti-poisoning ability for the electrocatalytic oxidation of alcohols in alkaline media, a Pd Ag/PVA bimetallic nanocatalyst suitable for ethylene glycol oxidation was synthesized by a one-step hydrothermal method;Using transmission electron microscope(TEM), high magnification transmission microscope(HRTEM), electrochemical workstation and other testing methods to analyze the composition structure and alcohol oxidation performance of the sample. The results show that the prepared Pd_(8)Ag_(1) nanoparticles are uniformly distributed, with an average particle size of 9 nm, and the mass current density of the Pd_(8)Ag_(1)/PVA nanocatalyst with an atomic ratio of Pd to Ag of 8 ∶ 1 to ethylene glycol(EG) is 5 225 m A/mg, 14.37 times that of commercial Pd/C;After 5 000 s chronoamperometry(CA), the retained mass current density is 387.7 m A/mg, which is 24.2 times that of commercial Pd/C, showing good stability. Its excellent alcohol oxidation performance is derived from the synergistic effect of Pd Ag alloy.

关 键 词：聚乙烯醇 乙二醇 电催化氧化 PdAg 

分 类 号：TM911.4[电气工程—电力电子与电力传动] O643.3[理学—物理化学]