The nitrogen-coordinated metal single-atom catalysts(M−N−C SACs)with an ultra-high metal loading synthetized by direct high-temperature pyrolysis have been widely reported.However,most of metal single atoms in these c...The nitrogen-coordinated metal single-atom catalysts(M−N−C SACs)with an ultra-high metal loading synthetized by direct high-temperature pyrolysis have been widely reported.However,most of metal single atoms in these catalysts were buried in the carbon matrix,resulting in a low metal utilization and inaccessibility for adsorption of reactants during the catalytic process.Herein,we reported a facile synthesis based on the hard-soft acid-base(HSAB)theory to fabricate Co single-atom catalysts with highly exposed metal atoms ligated to the external pyridinic-N sites of a nitrogen-doped carbon support.Benefiting from the highly accessible Co active sites,the prepared Co−N−C SAC exhibited a superior oxygen reduction reactivity comparable to that of the commercial Pt/C catalyst,showing a high turnover frequency(TOF)of 0.93 e^(−)·s^(-1)·site^(-1)at 0.85 V vs.RHE,far exceeding those of some representative SACs with a ultra-high metal content.This work provides a rational strategy to design and prepare M−N−C single-atom catalysts featured with high site-accessibility and site-density.展开更多
TQ171.734 98010603纳米级微孔SiO<sub>2</sub>玻璃材料制备技术研究.Ⅰ.纳米级微孔SiO<sub>2</sub> 玻璃粉末的研制=Studies of the technologiesof preparing microporous silica glass materials.I.Preparat...TQ171.734 98010603纳米级微孔SiO<sub>2</sub>玻璃材料制备技术研究.Ⅰ.纳米级微孔SiO<sub>2</sub> 玻璃粉末的研制=Studies of the technologiesof preparing microporous silica glass materials.I.Preparation of microporous silicapowder[刊,中]/曾庭英,刘剑波,邱勇,宋心琦（清华大学化学系.北京（100084））,杜金环,陈柳生（中科院化学研究所.北京（100080））//功能材料.—1997,28（3）.—268—271在研究了不同酸碱催化剂、不同化学添加助剂、不同热处理工艺对以正硅酸乙脂（TEOS）为原料。展开更多
基金supported by Shanxi Province Science Foundation for Youths(202203021212300)Taiyuan University of Science and Technology Scientific Research Initial Funding(20212064)Outstanding Doctoral Award Fund in Shanxi Province(20222060).
文摘The nitrogen-coordinated metal single-atom catalysts(M−N−C SACs)with an ultra-high metal loading synthetized by direct high-temperature pyrolysis have been widely reported.However,most of metal single atoms in these catalysts were buried in the carbon matrix,resulting in a low metal utilization and inaccessibility for adsorption of reactants during the catalytic process.Herein,we reported a facile synthesis based on the hard-soft acid-base(HSAB)theory to fabricate Co single-atom catalysts with highly exposed metal atoms ligated to the external pyridinic-N sites of a nitrogen-doped carbon support.Benefiting from the highly accessible Co active sites,the prepared Co−N−C SAC exhibited a superior oxygen reduction reactivity comparable to that of the commercial Pt/C catalyst,showing a high turnover frequency(TOF)of 0.93 e^(−)·s^(-1)·site^(-1)at 0.85 V vs.RHE,far exceeding those of some representative SACs with a ultra-high metal content.This work provides a rational strategy to design and prepare M−N−C single-atom catalysts featured with high site-accessibility and site-density.
文摘TQ171.734 98010603纳米级微孔SiO<sub>2</sub>玻璃材料制备技术研究.Ⅰ.纳米级微孔SiO<sub>2</sub> 玻璃粉末的研制=Studies of the technologiesof preparing microporous silica glass materials.I.Preparation of microporous silicapowder[刊,中]/曾庭英,刘剑波,邱勇,宋心琦（清华大学化学系.北京（100084））,杜金环,陈柳生（中科院化学研究所.北京（100080））//功能材料.—1997,28（3）.—268—271在研究了不同酸碱催化剂、不同化学添加助剂、不同热处理工艺对以正硅酸乙脂（TEOS）为原料。
