Impact on the Formation and Catalytic Property of Pt-Based Nanocatalysts by Galvanic Reaction with Co-Reduction Agents
Impact on the Formation and Catalytic Property of Pt-Based Nanocatalysts by Galvanic Reaction with Co-Reduction Agents
复制标题
DOI：
10.1021/acs.chemmater.2c02659
复制
发表时间：
2022-10
影响因子：
8.6
通讯作者：
John R. Crockett;Maggie Wang;Joseph E. Doebler;Tejal Pawale;Xiao Li;Ying Bao
中科院分区：
文献类型：
--
作者：
John R. Crockett;Maggie Wang;Joseph E. Doebler;Tejal Pawale;Xiao Li;Ying Bao
研究表明，控制Pt基纳米晶的形貌和成分可以有效增强催化性能。我们报告了一项关于在银壳模板和 Pt 前体之间的电偶置换反应 (GRR) 中使用共还原剂的影响的详细研究，以更好地控制所制造的 Pt 基催化剂的形态、组成和最终性能。通过还原穿过mSiO2层的银离子，然后沉积在AuNDBs的表面上，合成了介孔二氧化硅负载的银壳包覆的金纳米哑铃纳米结构（AuNDB@Ag@mSiO2）。这些用作模板，并且这些模板的形态和光学性质可以通过改变沉积条件下Ag + 的量来调整。 mSiO2层表现出一定的柔韧性并且不影响AuNDBs表面银壳的形成。此外，模板银壳的厚度和 GRR 中使用的还原剂的强度会影响所得 Pt 基催化剂的形态、组成和催化性能。研究并讨论了这些观察结果的合理机制。
It has been shown that controlling the morphology and composition of Pt-based nanocrystals can effectively enhance catalytic properties. We report a detailed study on the impact of using co-reducing agents in the galvanic replacement reaction (GRR) between Ag shell templates and Pt precursors to better control the morphology, composition, and resulting performance of the fabricated Pt-based catalysts. Mesoporous silica-supported silver shell-coated gold nanodumbbell nanostructures (AuNDB@Ag@mSiO2) are synthesized via reducing silver ions which have penetrated through the mSiO2layer and then be deposited on the surface of the AuNDBs. These are used as templates and the morphology and optical properties of these templates can be adjusted by altering the amount of Ag+in the depositing condition. The mSiO2layer shows some flexibility and does not influence the silver shell formation on the surface of AuNDBs. Additionally, the thickness of the silver shell of the template and the strength of the reducing agent used in the GRR impact the morphology, composition, and catalysis performance of the resulting Pt-based catalysts. A plausible mechanism on those observations is studied and discussed.