Zhang Zhenbo, Li Jing, Liu Shuyun, Zhou Xue, Xu Lin, Tian Xinlong, Yang Jun, Tang Yawen
School of Chemistry and Materials Science, Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, Nanjing Normal University, Nanjing, 210023, P. R. China.
State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan Provincial Key Lab of Fine Chemistry, School of Chemical Engineering and Technology, Hainan University, Haikou, 570228, P. R. China.
Small. 2022 Jul;18(29):e2202782. doi: 10.1002/smll.202202782. Epub 2022 Jun 26.
The precise and comprehensive manipulation of the component, size, and geometric nano-architecture of platinum-based electrocatalysts into porous and hollow structure can effectively impart the catalysts with substantially improved electrochemical performance, yet remain formidably challenging. Herein, a straightforward fabrication of porous platinum-copper alloyed nanobowls (abbreviated as Pt Cu NBs hereafter) assembled by ultrafine nanoparticles (≈2.9 nm) via a one-pot hydrothermal approach with the assistance of a structure-directing agent of N,N'-methylenebisacrylamide (MBAA) is reported. The involvement of MBAA plays a decisive role in the formation of Pt-MBAA complex solid nanospheres, which serve as the self-sacrificial reactive template for the deposition/growth of Pt Cu nanoparticles and the eventual formation of the asymmetric open-shelled nanobowls. Benefitting from the 3D sufficient accessibility of exterior/interior surfaces, high atom-utilization efficiency, and PtCu bimetallic alloy synergy, the self-supported Pt Cu NBs demonstrate remarkably enhanced activity, better anti-poisoning capability, and reinforced robustness for the methanol oxidation reaction (MOR) as compared with the commercial Pt black benchmark, exhibiting great application promises in practical fuel cell systems. It is envisaged that the innovative self-templated synthetic strategy outlined here may provide a perspective to design a range of porous bowl-shaped high-performance nanocatalysts.
将铂基电催化剂的组成、尺寸和几何纳米结构精确且全面地调控为多孔和中空结构，可有效赋予催化剂显著改善的电化学性能，但这仍然极具挑战性。在此，报道了一种通过一锅水热法，在N,N'-亚甲基双丙烯酰胺（MBAA）结构导向剂的辅助下，由超细纳米颗粒（≈2.9 nm）组装而成的多孔铂铜合金纳米碗（以下简称为Pt Cu NBs）的简便制备方法。MBAA的参与在Pt-MBAA复合固体纳米球的形成中起决定性作用，这些纳米球作为Pt Cu纳米颗粒沉积/生长以及最终形成不对称开壳纳米碗的自牺牲反应模板。受益于外部/内部表面的三维充分可及性、高原子利用效率以及PtCu双金属合金协同效应，与商业铂黑基准相比，自支撑的Pt Cu NBs在甲醇氧化反应（MOR）中表现出显著增强的活性、更好的抗中毒能力和更强的稳定性，在实际燃料电池系统中展现出巨大的应用前景。据设想，这里概述的创新自模板合成策略可能为设计一系列多孔碗状高性能纳米催化剂提供一个视角。
