Effects of heat treatment atmosphere on the structure and activity of Pt3Sn nanoparticle electrocatalysts: a characterisation case study,Faraday Discussions

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Effects of heat treatment atmosphere on the structure and activity of Pt3Sn nanoparticle electrocatalysts: a characterisation case study
Faraday Discussions ( IF 3.3 ) Pub Date : 2018-04-16 , DOI: 10.1039/c7fd00221a
Haoliang Huang _{1,

2,

3,

4} , Abu Bakr Ahmed Amine Nassr _{1,

2,

3,

4,

5} , Verónica Celorrio _{4,

6,

7,

8,

9} , S. F. Rebecca Taylor _{4,

10,

11,

12,

13} , Vinod Kumar Puthiyapura _{4,

10,

11,

12,

13} , Christopher Hardacre _{4,

10,

11,

12,

13} , Dan J. L. Brett _{4,

14,

15,

16} , Andrea E. Russell _{1,

2,

3,

4}

Affiliation

Comprehensive identification of the phases and atomic configurations of bimetallic nanoparticle catalysts are critical in understanding structure–property relationships in catalysis. However, control of the structure, whilst retaining the same composition, is challenging. Here, the same carbon supported Pt₃Sn catalyst is annealed under air, Ar and H₂ resulting in variation of the extent of alloying of the two components. The atmosphere-induced extent of alloying is characterised using a variety of methods including TEM, XRD, XPS, XANES and EXAFS and is defined as the fraction of Sn present as Sn⁰ (XPS and XANES) or the ratio of the calculated composition of the bimetallic particle to the nominal composition according to the stoichiometric ratio of the preparation (TEM, XRD and EXAFS). The values obtained depend on the structural method used, but the trend air < Ar < H₂ annealed samples is consistent. These results are then used to provide insights regarding the electrocatalytic activity of Pt₃Sn catalysts for CO, methanol, ethanol and 1-butanol oxidation and the roles of alloyed Sn and SnO₂.

中文翻译：

热处理气氛对Pt ₃ Sn纳米粒子电催化剂结构和活性的影响：表征案例研究

对双金属纳米粒子催化剂的相和原子构型的全面鉴定对于理解催化中的结构与性质之间的关系至关重要。然而，在保持相同组成的同时控制结构是具有挑战性的。在此，将相同的碳负载的Pt ₃ Sn催化剂在空气，Ar和H ₂下退火，导致两种组分的合金化程度变化。大气诱导的合金化程度可使用多种方法进行表征，包括TEM，XRD，XPS，XANES和EXAFS，并定义为Sn占Sn ⁰的比例（XPS和XANES）或根据制剂的化学计量比（TEM，XRD和EXAFS）计算出的双金属颗粒组成与名义组成之比。获得的值取决于所使用的结构方法，但是趋势空气<Ar <H ₂退火样品是一致的。然后，这些结果可用于提供有关Pt ₃ Sn催化剂对CO，甲醇，乙醇和1-丁醇氧化的电催化活性以及合金化的Sn和SnO ₂的作用的见解。

更新日期：2018-09-03

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