液相脱合金法制备PtCo合金低铂催化剂及性能研究
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摘要
为了提高Pt的利用率,采用液相脱合金法将Pt-Co合金进行脱合金处理,然后对脱合金后的催化剂进行煅烧。采用XRD、EDS、TEM以及CV和LSV对催化剂的结构和电化学性能进行表征和测试。结果显示:液相脱合金可有效去除Pt Co合金表层的非铂金属,经煅烧后可形成以Pt Co合金为核,Pt为壳的核壳型催化剂,催化剂煅烧后的电化学性能明显提高。通过液相脱合金对催化剂进行结构优化,可减少催化剂中非贵金属离子在酸性电解质溶液中的流失及流失金属离子对膜材料的损伤,提高催化剂的稳定性,延长电池整体寿命。
In order to improve the utilization of Pt,the Pt-Co alloy was de-alloyed by liquid-phase alloying method and then the de-alloyed catalyst was calcined. The structure and electrochemical properties of the catalysts were characterized and tested by XRD,EDS,TEM,CV and LSV. The results show that the liquid phase alloy can effectively remove the non-platinum metal on the surface of Pt Co alloy. After calcination,the core-shell catalyst with Pt Co alloy as core and Pt shell can be formed. The electrochemical performance of the catalyst after calcination is obviously improved. The structure optimization of the catalyst by liquid phase alloying can reduce the loss of the non-precious metal ions in the acidic electrolyte solution and the loss of metal ions on the membrane material,improve the stability of the catalyst and prolong the overall battery life.
In order to improve the utilization of Pt,the Pt-Co alloy was de-alloyed by liquid-phase alloying method and then the de-alloyed catalyst was calcined. The structure and electrochemical properties of the catalysts were characterized and tested by XRD,EDS,TEM,CV and LSV. The results show that the liquid phase alloy can effectively remove the non-platinum metal on the surface of Pt Co alloy. After calcination,the core-shell catalyst with Pt Co alloy as core and Pt shell can be formed. The electrochemical performance of the catalyst after calcination is obviously improved. The structure optimization of the catalyst by liquid phase alloying can reduce the loss of the non-precious metal ions in the acidic electrolyte solution and the loss of metal ions on the membrane material,improve the stability of the catalyst and prolong the overall battery life.
引文
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[4]Godin-Beekmann S.Stratospheric and Tropospheric Ozone[J].The International Encyclopedia of Geography,2017.
[5]Green M A,Emery K,Hishikawa Y,et al.Solar cell efficiency tables(version 49)[J].Progress in photovoltaics:research and applications,2017,25(01):3-13.
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