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封面论文In situ XAFS characterization of bimetallic nanoparticle catalysts PtCo/C structure changes in the working conditions- NUCLEAR TECHNIQUES Vol. 39, Issue 6, Article number: 060101(2016)
- 作者机构：
1.中国科学院上海应用物理研究所 张江园区 上海 201204
2.同济大学 汽车学院 上海 201804
- 作者简介：
- 基金信息：Supported by the Major Project of Chinese National Programs for Fundamental Research and Development (973 Program);National Natural Science Foundation of China;National Natural Science Foundation of China
DOI：10.11889/j.0253-3219.2016.hjs.39.060101
CLC： TL99Received：30 March 2016，
Revised：13 April 2016，
Published：10 June 2016
- 稿件说明：
移动端阅览
Mingfeng SHANG, Tiantian ZHAO, Hongliang BAO, et al.
In situ XAFS characterization of bimetallic nanoparticle catalysts PtCo/C structure changes in the working conditions[J]. Nuclear techniques, 2016, 39(6): 060101Mingfeng SHANG, Tiantian ZHAO, Hongliang BAO, et al.
In situ XAFS characterization of bimetallic nanoparticle catalysts PtCo/C structure changes in the working conditions[J]. Nuclear techniques, 2016, 39(6): 060101 DOI： 10.11889/j.0253-3219.2016.hjs.39.060101.
摘要
用两步还原法制备的PtCo/C (10 wt% Pt)纳米催化剂具有与商业催化剂Pt/C (20 wt% Pt)接近的催化反应活性
使贵金属Pt的用量减少了50%。利用上海光源BL14W1线站的质子交换膜燃料电池(Proton exchange membrane fuel cell
PEMFC)原位X射线吸收精细结构谱(X-ray absorption fine structure
XAFS)实验装置
在以该PtCo/C作为燃料电池的阴极催化剂
以Pd/C作为阳极催化剂的条件下
原位表征PtCo/C在工作状态下的结构变化
PtCo/C的非原位XAFS数据没有观察到Pt-Co合金成分
发现存在显著的Co-O键和Co-O-Co键贡献
且与Pt/C相比
Pt的氧化程度更高且具有更短的Pt-Pt金属键长
说明PtCo/C中的Co主要以氧化物种形式存在
且Co的存在影响着活性成分Pt的结构。原位XAFS数据表明随着电压的逐渐降低
PtCo/C中Pt和Co的氧化程度降低
揭示了在催化反应过程中Pt的d电子向过渡金属Co的转移过程。
Abstract
Background
2
The proton exchange membrane fuel cell (PEMFC) is considered as one of the most promising clean energy sources in the future
because of its high energy density and simple construction.However
the large scale commercial application of fuel cell is limited by the factors such as cost
durability and reliability.
Purpose
2
For the purpose of reducing the cost and improving the performance of the PEMFC
transition metal elements alloy Pt nanoparticles (PtFe/C
PtCo/C
PtNi/C) catalysts have been studied in recent years.
Methods
2
In situ
X-ray absorption fine structure (XAFS) experimental testing device for PEMFC on beamline (BL14W1) of XAFS spectroscopy at the Shanghai Synchrotron Radiation Facility (SSRF) is conducted to explore the nanostructure changes of PtCo/C during the fuel cell operation.
Results
2
In situ
XAFS spectra indicts that Pt
and Co are gradually being reduced as the voltage of fuel cell decreases.
Ex-situ
XAFS spectra show Pt and Co did not form Pt-Co bond
but there is a strong Co-O bond and Co-O-Co bond.
Conclusion
2
The element of Co improves the performance of PtCo/C catalysts for the oxygen reduction reaction (ORR) and decreases the cost of fuel cells by regulating the electronic structure of Pt.
关键词
Keywords
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