原位聚合法合成PPy/Pt及其对甲酸-甲酸盐水溶液体系的电化学催化氧化性能研究
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- 英文论文题名：Study of the Electrocatalysis of Polypyrrole-Modified Platinum for the Catalytic Oxidation of Fomic Acid-Formate System
- 论文作者：张瑞红 ; 靳美丽 ; 王军
- 英文论文作者：Ruihong Zhang ; Meili Jin ; Jun Wang ; Department of Chemistry ; University of Northeastern
- 年：2016
- 作者机构：东北大学;
- 论文关键词：聚吡咯 ; 原位聚合法 ; 甲酸根阴离子 ; 电化学催化氧化
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十九分会：电化学材料
- 语种：中文
- 分类号：O646;O631.5
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十九分会 ; 电化学材料
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：335k
- 原文格式：D
- 会议级别：全国
摘要
本文采用原位化学氧化聚合法,以过硫酸铵为氧化剂,对-甲基苯磺酸为掺杂剂,使吡咯单体直接氧化聚合,制备了聚吡咯修饰的铂电极(PPy/Pt)。实验结果表明,所合成的PPy呈珊瑚状,由直径约100nm的球形颗粒堆叠而成。材料平均电导率为39.8±1S·cm~(-1)。经PPy修饰后,Pt电极对甲酸根阴离子氧化的电化学催化性能显著提高。由于溶液中HCOO--HCOOH离子对的存在对溶液pH值的变化有缓冲作用,因此甲酸盐浓度的提高仅仅会使溶液pH略有增加。而本研究结果表明,在一定的浓度范围内,甲酸盐浓度的增加却会导致氧化电流密度的显著增大。因此我们认为,在本实验条件下,电化学氧化的主要通道为甲酸根阴离子的氧化,同时也伴随着甲酸的直接氧化和间接氧化。在0.2mol·L~(-1)硫酸和2.0mol·L~(-1)甲酸钠混合水溶液中,氧化峰电流密度可达40mA·cm~(-2)。与纯铂电极相比,循环伏安曲线的正、反扫峰的峰电流密度之比提高了19%。这说明PPy修饰Pt电极的抗羰基和类羰基物种毒化的能力有所提高。在0.2mol·L~(-1)硫酸水溶液中,PPy/Pt电化学催化作用所适宜的甲酸盐浓度范围为1.0-4.0 mol·L~(-1)。
Polypyrrole was applied to modify Pt(PPy/Pt) by in situ self-assembly method. The effect of PPy/Pt on electro-catalyzed oxidation of fomic acid-formate System was investigated. Cyclic voltammetric measurements indicated the electrocatalytic performance and the ability to resist the poisoning of CO or CO-like species were enhanced obviously through the modification. It showed that the current density of oxidation peak in sulfuric acid and sodium formate mixed solution can reach 40 mA · cm~(-2).The ratio of the forward and backward scanning peak current density was increased by 19% than the pure Pt. Under this experimental condition, the suitable electrocatalytic concentration range of sodium formate was 1.0-4.0 mol·L~(-1).
Polypyrrole was applied to modify Pt(PPy/Pt) by in situ self-assembly method. The effect of PPy/Pt on electro-catalyzed oxidation of fomic acid-formate System was investigated. Cyclic voltammetric measurements indicated the electrocatalytic performance and the ability to resist the poisoning of CO or CO-like species were enhanced obviously through the modification. It showed that the current density of oxidation peak in sulfuric acid and sodium formate mixed solution can reach 40 mA · cm~(-2).The ratio of the forward and backward scanning peak current density was increased by 19% than the pure Pt. Under this experimental condition, the suitable electrocatalytic concentration range of sodium formate was 1.0-4.0 mol·L~(-1).
引文
[1]刘洁,王菊香等.节能技术,2010,28(162):365
[2]Lu L.;Shen L.P.;Shi Y.;et al.Electrochimica Acta,2012,85:187.
[3]Chen M.;Wang Z.B.Fuel Cells,2010,10(6):1171.
[2]Lu L.;Shen L.P.;Shi Y.;et al.Electrochimica Acta,2012,85:187.
[3]Chen M.;Wang Z.B.Fuel Cells,2010,10(6):1171.