Ni含量对纳米多孔PdAg催化剂电催化氧化甲醇性能的影响  

Effect of Ni content on the performance of nano-porous PdAg catalyst for electrocatalytic oxidation of methanol

作　　者：宋衍滟 陈盈 赵钰淳 胡泳池 巫云龙 刘毅 苏晓磊 SONG Yanyan;CHEN Ying;ZHAO Yuchun;HU Yongchi;WU Yunlong;LIU Yi;SU Xiaolei(School of Materials Science&Engineering,Xi’an Polytechnic University,Xi’an 710048,China)

机构地区：[1]西安工程大学材料工程学院,陕西西安710048

出　　处：《纺织高校基础科学学报》2022年第3期101-107,共7页Basic Sciences Journal of Textile Universities

基　　金：陕西省自然科学基础研究计划项目(2021JQ-666);陕西省高校科协青年人才托举计划项目(20190608);中国纺织工业联合会科技指导性计划项目(2021041)。

摘　　要：采用电弧熔炼-熔体快淬法制备了AlPdAgNi前驱体合金薄带,通过脱合金法制备出不同镍含量下的纳米多孔PdAgNi催化剂,以提高燃料电池阳极催化剂Pd的催化性能,降低成本。利用SEM、TEM等手段表征样品微观形貌,并测试了其电催化氧化甲醇性能。结果表明:PdAgNi催化剂为纳米多孔结构,孔径约为5 nm;随着Ni含量的增加,纳米多孔PdAgNi系列合金样品的电催化甲醇峰值电流密度呈现出先增后降的趋势,其中Ni含量(原子百分含量)为2%时,样品的电催化氧化甲醇性能最佳。此时,纳米多孔PdAgNi催化剂活性和稳定性分别约为同等条件下纳米多孔Pd催化剂的1.3和4.5倍,商用Pd/C催化剂的5.7和13.1倍,商用Pt/C催化剂的4.6和37.8倍,并且反应动力学得到了显著的改进。For the sake of improving the catalytic performance of fuel cell anode catalyst Pd and reducing the cost,the nano-porous PdAgNi catalysts with different nickel content were prepared by dealloying AlPdAgNi precursor alloy ribbons prepared by arc melting-melt rapid quenching method.These catalysts are characterized by means of SEM and TEM,and their electrocatalytic performances for oxidation of methanol were tested.The results show that PdAgNi catalyst has a nano-porous structure with a pore size of about 5 nm.With the increase of Ni content,the peak current density of electrocatalytic methanol in nano-porous PdAgNi catalysts first increases and then decreases.The best electrocatalytic performance has been achieved when Ni content is 2 at%,whose activity and stability are respectively about 1.3 and 4.5 times of that of nano-porous Pd catalyst under the same conditions,5.7 and 13.1 times of commercial Pd/C catalyst,4.6 and 37.8 times of commercial Pt/C catalyst.The reaction kinetics was significantly improved.

关 键 词：脱合金 多金属催化剂 电催化性能 

分 类 号：TQ426.8[化学工程]