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摘要：本文主要采用浸渍-还原的方法制备了以碳粉VulcanXC-72为载体不同还原反应时间（2h、3.5h、5h）和不同比例的Pt-Ag/C催化剂。通过循环伏安法比较催化剂的电催化性能，并通过TEM 、XRD对上述催化剂进行表征。利用 CHI660d 电化学工作站分别在酸性（H2SO4）、碱性（NaOH）条件下对它们进行了不同温度（20°C、25°C、30°C、40°C）下的电化学性能测试。XRD、TEM结果表明：所制备的催化剂材料均为面心立方结构，催化剂颗粒能很好的分布在碳载体上，二元催化剂粒径在10nm左右。CV结果表明: 在Pt/C催化剂中引入单金属Ag制备成Pt-Ag/C催化剂之后，催化剂活性提高。催化剂在碱性条件下的催化效果优于酸性条件，Pt含量为5%时，还原时间为5h时的催化剂中金属Pt的利用率较高，催化活性较好；Pt含量为10%时，还原时间2h的催化剂活性最高。30567
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毕业论文关键词： 燃料电池；Pt-Ag/C催化剂；阴极催化剂；电还原；双氧水
Study on preparation technology of different proportion Pt - Ag/C nanometer alloy catalyst
Abstract: In this paper, by using impregnation-reduction method, we prepared the Pt-Ag/C catalysts at different reduction reaction time (2h, 3.5h, 5h ) and different mass ratios of Pt/Ag on the carbon VulcanXC-72. Cyclic voltammetry were used to compare the electric catalytic properties of catalysts, and all of them were characterized by TEM and XRD. Their electrochemical performance were tested by CHI660d electrochemical workstation at different temperatures (20°C, 25°C, 30°C, 40°C) in acidic and alkaline medias respectively. The XRD and TEM results show that the preparation of catalyst materials are face-centered cubic structure, and their particles can be well distributed on the carbon support. The diameter of binary catalyst particles is about 10nm.The CV results show that replacing Pt by Ag to form the Pt-Ag/C alloy catalyst has improved the catalytic activity in some extent. The catalytic effect in alkaline conditions is better than in acid conditions, when the proportion of Pt is 5%, the reduction reaction time is 5 h, the utilization and catalytic activity of Pt is the highest; when the proportion of Pt is 10%, the reduction reaction time is 2 h, the utilization and catalytic activity of Pt is the best.
Key words: fuel cells; Pt - Ag/C catalyst; cathode catalyst; Electric reduction; Hydrogen peroxide
目录
1 绪论 1
1.1 引言 1
1.2 燃料电池概述 1
1.3 直接硼氢化钠-双氧水燃料电池（DBHFC） 3
1.3.1 DBHFC的特点 3
1.3.2 DBHFC的工作原理 4
1.3.2.1 阳极反应 4
1.3.2.2 阴极反应 5
1.3.3 DBHFC的研究现状 6
1.4 DBHFC阴极催化剂 6
1.4.1 DBHFC阴极催化剂的种类 7
1.4.2 DBHFC阴极催化剂的载体 8
1.4.3 DBHFC阴极催化剂的制备方法 10
1.4.4 DBHFC阳极催化剂的种类 11
1.5 本论文研究的目的、意义及主要内容 13
1.5.1 本文研究的目的及意义 13
1.5.2 研究内容 13
2 实验部分 14
2.1 实验药品 14
2.2 实验仪器 14
2.3 催化剂制备 15
2.3.1 碳载体的预处理 15
2.3.2 20% Pt/C催化剂的制备 15
2.3.3 10%Ag/C催化剂的制备 16
2.3.4 Pt-Ag/C催化剂的制备 16
2.3.5 电极制备方法 16
2.4催化剂的表征 16