原位XAFS表征双金属纳米催化剂PtCo/C在工作状态下的结构变化

尚明丰; 赵天天; 鲍洪亮; 段佩权; 林瑞; 黄宇营; 王建强

doi:10.11889/j.0253-3219.2016.hjs.39.060101

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原位XAFS表征双金属纳米催化剂PtCo/C在工作状态下的结构变化

同步辐射技术及应用 | 更新时间：2021-05-24

- 原位XAFS表征双金属纳米催化剂PtCo/C在工作状态下的结构变化
  封面论文
- In situ XAFS characterization of bimetallic nanoparticle catalysts PtCo/C structure changes in the working conditions
- 核技术 2016年39卷第6期文章编号：060101
- 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：
  
  [ "尚明丰,男,1982年出生,2007年毕业于南京师范大学,现为博士研究生,无机化学专业", "SHANG Mingfeng, male, born in 1982, graduated from Nanjing Normal University in 2007, doctor student, major in inorganic chemistry" ]
  黄宇营,E-mail:huangyuying@sinap.ac.cn HUANG Yuying,E-mail:huangyuying@sinap.ac.cn
  王建强,E-mail:wangjianqiang@sinap.ac.cn WANG Jianqiang,E-mail:wangjianqiang@sinap.ac.cn
- 基金信息：
  
  国家重点基础研究发展计划(973计划)(2013CB933104);国家自然科学基金(91127001);国家自然科学基金(11079005)
- DOI：10.11889/j.0253-3219.2016.hjs.39.060101
  中图分类号： TL99
- 收稿日期：2016-03-30，
  
  修回日期：2016-04-13，
  
  纸质出版日期：2016-06-10
- 稿件说明：
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尚明丰, 赵天天, 鲍洪亮, 等. 原位XAFS表征双金属纳米催化剂PtCo/C在工作状态下的结构变化[J]. 核技术, 2016,39(6):060101

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): 060101
尚明丰, 赵天天, 鲍洪亮, 等. 原位XAFS表征双金属纳米催化剂PtCo/C在工作状态下的结构变化[J]. 核技术, 2016,39(6):060101 DOI： 10.11889/j.0253-3219.2016.hjs.39.060101.

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): 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

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

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

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

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

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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