Effect of pretreatment of carbon support on electrocatalytic properties of Pt/C nanocatalysts

CAI Yuanrong; HUANG Rui; HUANG Long; RAO Lu; CHEN Shengpei; ZHOU Zhiyou; SUN Shigang

doi:10.3969/j.issn.0438-1157.2014.11.020

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Effect of pretreatment of carbon support on electrocatalytic properties of Pt/C nanocatalysts

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- Effect of pretreatment of carbon support on electrocatalytic properties of Pt/C nanocatalysts
- CIESC Journal Issue 11, Pages: 4356-4362(2014)
- 作者机构：
  
  厦门大学化学化工学院化学系, 固体表面物理化学国家重点实验室,福建,厦门,361005
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2014.11.020
  CLC： 646
- Online First：05 November 2014，
  
  Published：05 November 2014
- 稿件说明：
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CAI Yuanrong, HUANG Rui, HUANG Long, et al. Effect of pretreatment of carbon support on electrocatalytic properties of Pt/C nanocatalysts[J]. CIESC Journal, 2014, (11): 4356-4362.
DOI：

CAI Yuanrong, HUANG Rui, HUANG Long, et al. Effect of pretreatment of carbon support on electrocatalytic properties of Pt/C nanocatalysts[J]. CIESC Journal, 2014, (11): 4356-4362. DOI： 10.3969/j.issn.0438-1157.2014.11.020.

摘要

利用NaBH4还原机制

采用经不同方法预处理的碳载体成功制备出Pt/C-HNO3、Pt/C-H2O2和Pt/C 3种碳载铂纳米催化剂.通过扫描电镜(SEM)、透射电镜(HR-TEM)、循环伏安(CV)和COad溶出技术进行表征.结果表明

所制备的催化剂大小分布较为均一

平均粒径约为4 nm;HR-TEM观察发现

Pt/C-HNO3中铂纳米粒子的表面具有较高的台阶原子密度;在COad溶出实验中Pt/C-HNO3表现出较强的抗一氧化碳毒化能力;所制备的3种催化剂及商业催化剂Pt/C JM对乙醇氧化的电催化活性顺序为:Pt/C-HNO3 > Pt/C-H2O2 > Pt/C > Pt/C JM

其中Pt/C-HNO3的电催化活性和稳定性分别为Pt/C JM的1.5倍和1.9倍.

Abstract

Carbon supported Pt nanocatalysts (Pt/C) are widely used in fuel cells. In this work

three kinds of Pt/C catalysts were successfully prepared via a chemical reduction method by using carbon black pretreated with different methods

i.e.

HNO3-pretreated carbon (Pt/C-HNO3)

H2O2-pretreated carbon (Pt/C-H2O2) and unpretreated carbon (Pt/C). The morphologies and properties of the as-prepared Pt/C catalysts were characterized by SEM

HR-TEM

CV and COad stripping. Pt nanoparticles were dispersed well in these three Pt/C catalysts with average particle size of 3.4

3.9 and 4.5 nm respectively. HR-TEM observation indicated that Pt/C-HNO3 possessed high-density of step atoms and COad stripping experiments showed that Pt/C-HNO3 exhibited the best anti-poisoning property. Comparing the catalytic activities of three as-prepared Pt/C catalysts toward ethanol electrooxidation with commercial Pt/C catalyst (Pt/C JM) showed that the as-prepared catalysts exhibited higher activity and stability than those of Pt/C JM and the order was Pt/C-HNO3>Pt/C-H2O2>Pt/C>Pt/C JM. Especially for Pt/C-HNO3

its activity and stability were 1.5 times and 1.9 times of those of Pt/C JM respectively.

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