相关实验视频

Updated: Jul 27, 2025

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

Published on: April 27, 2018

--/-芯/外纳米板实现直接酸氧化催化的完整脱路径

Xinrui Hu¹, Zhengyi Xiao¹, Weizhen Wang²

¹State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.

Journal of the American Chemical Society

|June 8, 2023

概括

我们开发了新的--/-核心/外纳米板,用于直接酸燃料电池中的高活性和选择性酸氧化反应 (FAOR). 这些催化剂的性能远远超过商业选择,为商业化铺平了道路.

科学领域:

电化学
材料科学
催化剂

背景情况:

开发用于酸氧化反应 (FAOR) 的有效催化剂对于直接酸燃料电池 (DFAFC) 至关重要.
对 (Pt) 基催化剂来说,实现直接脱途径的高活性和选择性仍然是一个重大挑战.
碳中毒和低选择性阻碍了当前FAOR催化剂的性能.

研究的目的:

设计和合成基于Pt的新型核心/外纳米板,以提高FAOR.
在膜电极组件 (MEA) 中研究这些新催化剂的催化活性,选择性和耐用性.
阐明结构与活动的关系以及性能改善的机制.

主要方法:

表面不均的PtPbBi/PtBi核心/外纳米板 (NP) 的合成.
电化学表征包括循环电压测量和时电压测量.
现场里叶变换光谱 (FTIR) 和X射线吸收光谱 (XAS) 用于机械研究.
在单个直接酸燃料电池 (DFAFC) 装置中进行测试.

主要成果:

PtPbBi/PtBiNP表现出前所未有的特异性和质量活动 (25.1 mA cm−2和7.4 A mgPt−1),明显超过商业Pt/C.
催化剂对直接脱途径具有很高的选择性,并且具有较弱的二氧化碳吸附.
在DFAFC中实现了161.5 mW cm-2的峰值功率密度,在10小时内具有良好的稳定性.
现场光谱研究显示PtPbBi和PtBi之间的电子相互作用,而PtBi外有效地减轻了CO中毒.

结论:

开发的PtPbBi/PtBi核心/外纳米板是FAOR高度活跃和选择性的催化剂.
独特的核心/外结构和组成促进了直接脱的途径,并提高了催化剂对CO的耐受性.
这些发现代表了DFAFC的催化剂设计的重大进步,证明了100%的直接反应选择性和商业化潜力.

更多相关视频

A Salt-Templated Synthesis Method for Porous Platinum-based Macrobeams and Macrotubes

A Salt-Templated Synthesis Method for Porous Platinum-based Macrobeams and Macrotubes

Published on: May 18, 2020

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Published on: December 6, 2021

相关概念视频

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...

Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride

Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride

Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation...