纳米孔
材料科学
胶体金
模板
纳米技术
催化作用
纳米颗粒
多孔性
化学工程
化学
复合材料
生物化学
工程类
作者
Srikanth Pedireddy,Hiang Kwee Lee,Weng Weei Tjiu,In Yee Phang,Hui Ru Tan,Shu Quan Chua,Cédric Troadec,Xing Yi Ling
摘要
Nanoporous gold with networks of interconnected ligaments and highly porous structure holds stimulating technological implications in fuel cell catalysis. Current syntheses of nanoporous gold mainly revolve around de-alloying approaches that are generally limited by stringent and harsh multistep protocols. Here we develop a one-step solution phase synthesis of zero-dimensional hollow nanoporous gold nanoparticles with tunable particle size (150–1,000 nm) and ligament thickness (21–54 nm). With faster mass diffusivity, excellent specific electroactive surface area and large density of highly active surface sites, our zero-dimensional nanoporous gold nanoparticles exhibit ~1.4 times enhanced catalytic activity and improved tolerance towards carbonaceous species, demonstrating their superiority over conventional nanoporous gold sheets. Detailed mechanistic study also reveals the crucial heteroepitaxial growth of gold on the surface of silver chloride templates, implying that our synthetic protocol is generic and may be extended to the synthesis of other nanoporous metals via different templates. Nanoporous gold has many potential catalytic applications and is usually fabricated via de-alloying strategies. Here, the authors report a one-step solution phase synthesis of tunable zero-dimension porous gold nanostructures and evaluate them for methanol electrocatalysis.
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