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Li, Zhi; Chen, Yuanjun; Ji, Shufang; Tang, Yan; Chen, Wenxing; Li, Ang; Zhao, Jie; Xiong, Yu; Wu, Yuen; Gong, Yue; Yao, Tao; Liu, Wei; Zheng, Lirong; Dong, Juncai; Wang, Yu; Zhuang, Zhongbin; Xing, Wei; He, Chun-Ting; Peng, Chao; Cheong, Weng-Chon; Li, Qiheng; Zhang, Maolin; Chen, Zheng; Fu, Ninghua; Gao, Xin; Zhu, Wei; Wan, Jiawei; Zhang, Jian; Gu, Lin; Wei, Shiqiang; Hu, Peijun; Luo, Jun; Li, Jun; Chen, Chen; Peng, Qing; Duan, Xiangfeng; Huang, Yu; Chen, Xiao-Ming; Wang, Dingsheng; Li, Yadong
Nature chemistry, 08/2020, Letnik: 12, Številka: 8Journal Article
Single-atom catalysts not only maximize metal atom efficiency, they also display properties that are considerably different to their more conventional nanoparticle equivalents, making them a promising family of materials to investigate. Herein we developed a general host-guest strategy to fabricate various metal single-atom catalysts on nitrogen-doped carbon (M /CN, M = Pt, Ir, Pd, Ru, Mo, Ga, Cu, Ni, Mn). The iridium variant Ir /CN electrocatalyses the formic acid oxidation reaction with a mass activity of 12.9 Formula: see text whereas an Ir/C nanoparticle catalyst is almost inert (~4.8 × 10 Formula: see text). The activity of Ir /CN is also 16 and 19 times greater than those of Pd/C and Pt/C, respectively. Furthermore, Ir /CN displays high tolerance to CO poisoning. First-principle density functional theory reveals that the properties of Ir /CN stem from the spatial isolation of iridium sites and from the modified electronic structure of iridium with respect to a conventional nanoparticle catalyst.
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in: SICRIS
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