采用微乳-溶剂热法制备了空心球状Fe3O4纳米晶。利用X射线衍射（XRD）和扫描电子显微镜（SEM）对所制备的样品进行晶型结构表征和形貌观察。制备的Fe3O4颗粒为粒径550 nm的空心球状。对以纳米Fe3O4空心球为电催化剂的锂-空气电池进行恒...采用微乳-溶剂热法制备了空心球状Fe3O4纳米晶。利用X射线衍射（XRD）和扫描电子显微镜（SEM）对所制备的样品进行晶型结构表征和形貌观察。制备的Fe3O4颗粒为粒径550 nm的空心球状。对以纳米Fe3O4空心球为电催化剂的锂-空气电池进行恒流充放电和交流阻抗测试。在50 m A·g-1的电流密度下,电池的首次放电容量高达1602 m Ah·g-1,放电电压平台为2.8~2.2 V,充电电压平台为3.8 V左右。展开更多
Porous Pt-Fe bimetallic nanocrystals have been synthesized via self-assembly and can effectively facilitate the synthesis of 2-propanol from acetone. The bimetallic catalyst has three--dimensional channels and shows t...Porous Pt-Fe bimetallic nanocrystals have been synthesized via self-assembly and can effectively facilitate the synthesis of 2-propanol from acetone. The bimetallic catalyst has three--dimensional channels and shows turnover frequencies （TOFs） of up to 972 h^-1 for a continuous process more than 50 h. Preliminary mechanistic studies suggest that the high reactivity is related to the interface consisting of a bimetallic Pt-Fe alloy and Fe2O3-x. An understanding of real catalytic behavior and the catalytic mechanism based on model systems has been shown to help fabricate an improved Pt/Fe3O4 catalyst with increased activity and lifetime which has great potential for large-scale industrial applications.展开更多
文摘采用微乳-溶剂热法制备了空心球状Fe3O4纳米晶。利用X射线衍射（XRD）和扫描电子显微镜（SEM）对所制备的样品进行晶型结构表征和形貌观察。制备的Fe3O4颗粒为粒径550 nm的空心球状。对以纳米Fe3O4空心球为电催化剂的锂-空气电池进行恒流充放电和交流阻抗测试。在50 m A·g-1的电流密度下,电池的首次放电容量高达1602 m Ah·g-1,放电电压平台为2.8~2.2 V,充电电压平台为3.8 V左右。
基金This work was supported by the National Basic Research Program of China （Nos. 2011CB932401, 2011CBA00500, and 2012CB224802）, and the National Natural Science Foundation of China （Nos. 21221062, 21171105, 21322107 and 21131004）.
文摘Porous Pt-Fe bimetallic nanocrystals have been synthesized via self-assembly and can effectively facilitate the synthesis of 2-propanol from acetone. The bimetallic catalyst has three--dimensional channels and shows turnover frequencies （TOFs） of up to 972 h^-1 for a continuous process more than 50 h. Preliminary mechanistic studies suggest that the high reactivity is related to the interface consisting of a bimetallic Pt-Fe alloy and Fe2O3-x. An understanding of real catalytic behavior and the catalytic mechanism based on model systems has been shown to help fabricate an improved Pt/Fe3O4 catalyst with increased activity and lifetime which has great potential for large-scale industrial applications.
