3 years ago

Confining Gold Nanoclusters in Highly Defective Graphitic Layers To Enhance the Methanol Electrooxidation Reaction

Confining Gold Nanoclusters in Highly Defective Graphitic Layers To Enhance the Methanol Electrooxidation Reaction
Gaowu Qin, Xiaoning Zhao, Wenting Zhang, Yixing Li, Rui Su, Zhe Mao, Junjie Guo, Xuefeng Zhang, Pengfei Guan, Peizhi Liu, Haihua Hu
The development of a highly efficient catalyst possessing both high activity and remarkable stability is a major focus in fuel-cell applications. Herein, we utilized an arc-discharge approach with an ultrafast cooling system to synthesize a core@shell structural Au@C nanocomposite comprising 3–5 nm gold clusters confined within highly defective graphitic layers. Such a construction not only improves the conductivity to accelerate the penetration of ions and electrons during the electrocatalytic process of methanol molecules, but it also suppresses chemical/thermal coarsening of the gold clusters. More importantly, the atomic-scale Au/C interfaces contribute to a synergistic effect and enhance the activity relative to that of other gold-based catalysts in the electrooxidation of methanol. This work highlights the role of heterogeneous interfaces in the catalytic efficiency of precious-metal catalysts and rationalizes optimization in catalyst engineering. Good as gold: A Au@C nanocomposite comprising 3–5 nm gold clusters confined within few-layered, highly defective graphitic cages is prepared; this nanocomposite exhibits high catalytic activity and excellent stability for the electrooxidation of methanol. The defective graphitic layers prohibit chemical/thermal coarsening of the gold clusters and also provide effective penetration channels for the transport of ions/electrons during the catalytic reaction.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/cctc.201700895

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