铂纳米晶的电化学清洁及其对甲醇的电催化性能研究
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- 英文论文题名：Electrochemical Decontamination of Platinum Nanocrystals and its Electrocatalytic Performances for methanol
- 论文作者：路蕾蕾 ; 杜宝中 ; 韩子姗 ; 陈丹
- 英文论文作者：Leilei Lu ; Baozhong Du ; Zishan Han ; Dan Chen ; Faculty of science ; Xi'an University of Technology
- 年：2016
- 作者机构：西安理工大学理学院;
- 论文关键词：铂纳米晶 ; 甲醇 ; 电催化 ; 聚乙烯吡咯烷酮(PVP) ; 形貌控制
- 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：TB383.1;TQ426
- 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：240k
- 原文格式：D
- 会议级别：全国
摘要
铂是燃料电池中最常用的催化剂,其催化活性和选择性与铂的形貌有很大关系~([1-2])。其中,聚乙烯吡咯烷酮(PVP)是最常用的一种调控铂纳米晶形貌的表面活性物质,但是,由于PVP能够强烈地吸附于铂表面,难以彻底去除,使得铂表面活性位不能有效地被利用,降低了其催化活性。本工作以氯铂酸为主要材料,采用PVP作稳定剂,通过添加不同浓度的硝酸银溶液控制铂纳米晶体的生长方向,分别得到了球形、立方体、八面体和截角八面体铂纳米晶。所制备的铂纳米晶分散良好,粒度较均匀。采用电位阶跃技术对所制备的铂纳米晶进行了处理,发现随着电位阶跃的进行,循环伏安图上氢氧的吸脱附峰越来越明显,并最终趋于稳定。采用该方法能够快速有效地去除铂表面的PVP,达到了对铂纳米晶清洁的目的。处理后的截角八面体铂纳米晶对甲醇电氧化表现出了最佳的催化活性,其氧化峰电流远高于其他形貌铂纳米晶。
This study put forward a simply and effective electrochemical decontamination method of the platinum surfaces capped by PVP. Platinum nanocrystals was synthesized by colloidal method using chloroplatinic acid as the metal precursor and PVP K30 as a stabilizer. Spherical, cubic, octahedral and truncated octahedral platinum nanocrystals were obtained by adding different concentrations of silver nitrate to the above colloidal solution. Electrochemical decontamination was applied to the platinum nanocrystals by short pulse potential step before electrocatalytic performance measurements. The electrochemical measurements showed that truncated octahedral platinum nanocrystals showed the best catalytic activity for methanol electrooxidation.
This study put forward a simply and effective electrochemical decontamination method of the platinum surfaces capped by PVP. Platinum nanocrystals was synthesized by colloidal method using chloroplatinic acid as the metal precursor and PVP K30 as a stabilizer. Spherical, cubic, octahedral and truncated octahedral platinum nanocrystals were obtained by adding different concentrations of silver nitrate to the above colloidal solution. Electrochemical decontamination was applied to the platinum nanocrystals by short pulse potential step before electrocatalytic performance measurements. The electrochemical measurements showed that truncated octahedral platinum nanocrystals showed the best catalytic activity for methanol electrooxidation.
引文
[1]Xia Y N,Xiong Y J,Lim B,Skrabalak,S E.Angew Chem Int Ed,2009,48:60.
[2]Tao A R,Habas S,Yang P D.Small,2008,4:310.
[2]Tao A R,Habas S,Yang P D.Small,2008,4:310.