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    题名: In-situ Exfoliation and Pt deposition of Antimonene for Formic Acid Oxidation via a Predominant Dehydrogenation Pathway
    作者: Yiqiong Zhang;Man Qiao;Yucheng Huang;Yuqin Zou;Zhijuan Liu,;Li Tao;Yafei Li;Chung-Li Dong;Shuangyin Wang
    日期: 2020-02-21
    上传时间: 2021-04-26 12:11:30 (UTC+8)
    摘要: Direct formic acid fuel cell (DFAFC) has been considered as a promising energy conversion device for stationary and mobile applications. Advanced platinum (Pt) electrocatalysts for formic acid oxidation reaction (FAOR) are critical for DFAFC. However, the oxidation of formic acid on Pt catalysts often occurs via a dual pathway mechanism, which hinders the catalytic activity owing to the CO poisoning. Herein, we directly exfoliate bulk antimony to 2D antimonene (Sb) and in situ load Pt nanoparticles onto antimonene sheets with the assistance of ethylenediamine. According to the Bader charge analysis, the charge transfer from antimonene to Pt occurs, confirming the electronic interaction between Pt and Sb. Interestingly, antimonene, as a cocatalyst, alters the oxidation pathway for FAOR over Pt catalyst and makes FAOR follow the more efficient dehydrogenation pathway. The density functional theory (DFT) calculation demonstrates that antimonene can activate Pt to be a lower oxidative state and facilitate the oxidation of HCOOH into CO2 via a direct pathway, resulting in a weakened intermediate binding strength and better CO tolerance for FAOR. The specific activity of FAOR on Pt/Sb is 4.5 times, and the mass activity is 2.6 times higher than the conventional Pt/C.
    關聯: Research 2020, 5487237
    DOI: 10.34133/2020/5487237
    显示于类别:[電機工程學系暨研究所] 期刊論文

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