稀土元素铈对铂铜复合膜电极结构及性能的影响

易沙; 杨滨; 赵之婧

稀土元素铈对铂铜复合膜电极结构及性能的影响

昆明理工大学材料科学与工程学院, 云南昆明 650093

基金项目:

国家自然科学基金 51261012

昆明理工大学分析测试基金 20150210

详细信息

中图分类号: TG146.4
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- 被引次数: 0
出版历程
- 收稿日期: 2016-06-13
- 修回日期: 2016-07-24
- 网络出版日期: 2021-01-23
- 刊出日期: 2016-10-10

Effect of Ce on the structure and properties of PtCu composite membrane electrodes

School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

More Information

Corresponding author: Tel: 13888857897, E-mail: yangbin@kmust.edu.cn

摘要

摘要: 通过离子束溅射技术分别制备铂铜复合膜电极及掺杂铈元素的铂铜复合膜电极，并在相同条件下对膜电极进行热处理及酸蚀处理。通过高分辨透射电镜、X射线衍射及电化学性能测试对膜电极进行结构及性能的研究。结果表明，在相同后处理条件下，铈元素的添加使铂铜复合膜电极表面出现“桥连”结构，同时促进铂铜元素的合金化程度增强，与纯Pt相比膜电极的析氢交换电流密度提升92.25%。
- 铈 /
- 复合膜电极 /
- 桥连结构 /
- 析氢性能
Abstract: All the membrane electrodes were prepared by ion beam sputtering (IBS) apparatus. Vacuum annealing in combination with acid etching was used as post-processing. The high resolution transmission electron microscopy and X-ray diffraction were employed to investigate the surface morphology and alloying degree of samples. The electrochemical performance was used to detect hydrogen evolution property. The result confirmed that, with the same condition of post-processing, the membrane electrode doped Ce had cross-bridged structure and higher alloying degree, and the electrochemical performance was enhanced by 92.25% compared to pure Pt.
- Ce /
- membrane electrodes /
- cross-bridged structure /
- hydrogen evolution property

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图 1 三电极电解池体系示意图

Figure 1 System of the three-electrode electrolytic cell

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图 2 膜电极的高分辨透射电镜照片

Figure 2 HRTEM & STEM image of membrane electrodes

(a)： original sample of pure Pt; (b)： corrosion sample of pure Pt; (c)： original sample of PtCu /C; (d)： corrosion sample of PtCu/C; (e)： original sample of PtCu-Ce/C; (f)： corrosion sample of PtCu-Ce/C

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图 3 膜电极的XRD谱图

Figure 3 XRD patterns of membrane electrodes

a： PtCu /C； b： PtCu-Ce/C

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图 4 膜电极的析氢性能表征

Figure 4 Cyclic voltammetry (CV)(a) and linear sweep voltammetry (LSV) (b)curves of various samples

a： PtCu /C; b： PtCu-Ce/C

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表 1 膜电极的制备参数

Table 1 Preparation parameters of membrane electrodes

Sample	Preparation step	Ar/sccm	Time t/s	Screen voltage V/kV	Beam current I/mA	Acceleration voltageV/kV
PtCu/C	ion beam sputtering	8	600	2.6	70	140
PtCu-Ce/C	ion beam assisting	7	300	0.3	30	200
	ion beam sputtering	8	600	2.6	70	140

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表 2 膜电极的ICP-AES分析

Table 2 ICP-AES analysis of PtCu/C and PtCu-Ce/C

Sample		Pt loading /(mg·cm^-2)	Cu loading /(mg·cm^-2)	Ce loading /(mg·cm^-2)
PtCu/C	before corrosion	0.057	0.051	-
	after corrosion	0.052	0.023	-
PtCu-Ce/C	before corrosion	0.063	0.047	0.025
	after corrosion	0.038	0.015	0.003

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表 3 膜电极的析氢性能

Table 3 Hydrogen evolution properties of membrane electrodes

Sample	Potential of the first hydrogen desorption peak E_d/(V vs SCE)	Exchange current density i₀ /(A·cm^-2)
Pt	-0.234	0.002 58
PtCu/C	-0.236	0.003 77
PtCu-Ce/C	-0.229	0.004 96

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