Binuclear iron phthalocyanine/reduced graphene oxide(bi-Fe Pc/RGO) nanocomposite with good electrocatalytic activity for ORR in alkaline medium was prepared in one step. High angle annular dark field image scanning tr...Binuclear iron phthalocyanine/reduced graphene oxide(bi-Fe Pc/RGO) nanocomposite with good electrocatalytic activity for ORR in alkaline medium was prepared in one step. High angle annular dark field image scanning transmission electron microscopy(HAADF-STEM) and energy dispersive X-ray spectroscopy element mapping results show bi-Fe Pc was uniformly distributed on RGO. An obvious cathodic peak located at about-0.23 V(vs. SCE) in CV and an onset potential of-0.004 V(vs. SCE) in LSV indicate the as-prepared bi-Fe Pc/RGO nanocomposite possesses high activity which is closed to Pt/C for ORR. The ORR on bi-Fe Pc/RGO nanocomposite follows four-electron transfer pathway in alkaline medium. Compared with Pt/C, there is only a slight decrease(about 0.02 V vs. SCE) for bi-Fe Pc/RGO nanocomposite when the methanol exists. The excellent activity and methanol tolerance in alkaline solutions proves that bi-Fe Pc/RGO nanocomposite could be considered as a promising cathode catalyst for alkaline fuel cells.展开更多
Chromatography theory shows that when the inner diameter of the chromatography column is very narrow(e.g.,1—2μm),the maximum efficiency will be produced in liquid chromatography.In addition,the increasing demand for...Chromatography theory shows that when the inner diameter of the chromatography column is very narrow(e.g.,1—2μm),the maximum efficiency will be produced in liquid chromatography.In addition,the increasing demand for ultrasmall volume sample analysis has produced the trend of narrowing the diameter of the liquid chromatography column.Experiments have verified that ultranarrow-bore open tubular liquid chromatography(i.d.≤2μm)has the advantages of small sample requirement and high separation efficiency.However,there also exist huge challenges along with such obvious advantages.This review summarizes the efforts made by our research group and other research groups to develop this field.We hope that in the near future,ultranarrow bore open-tube liquid chromatography can be successfully and maturely applied to the application of analytes with ultrasmall size and volume such as single-cell and even subcellular organelles omics research.展开更多
基金supported by the National Natural Science Foundation of China (21275014, 21375005)the Excellent Young Scientists Fund of NSFC (21322501)+2 种基金the Importation and Development of High-Caliber Talents Project of Beijing Municipal Institutions (CIT& TCD20140309)the Program for New Century Excellent Talents in University (NCET-12-0603)the Beijing Natural Science Foundation Program and Scientific Research Key Program of the Beijing Municipal Commission of Education (KZ201310005001)
文摘Binuclear iron phthalocyanine/reduced graphene oxide(bi-Fe Pc/RGO) nanocomposite with good electrocatalytic activity for ORR in alkaline medium was prepared in one step. High angle annular dark field image scanning transmission electron microscopy(HAADF-STEM) and energy dispersive X-ray spectroscopy element mapping results show bi-Fe Pc was uniformly distributed on RGO. An obvious cathodic peak located at about-0.23 V(vs. SCE) in CV and an onset potential of-0.004 V(vs. SCE) in LSV indicate the as-prepared bi-Fe Pc/RGO nanocomposite possesses high activity which is closed to Pt/C for ORR. The ORR on bi-Fe Pc/RGO nanocomposite follows four-electron transfer pathway in alkaline medium. Compared with Pt/C, there is only a slight decrease(about 0.02 V vs. SCE) for bi-Fe Pc/RGO nanocomposite when the methanol exists. The excellent activity and methanol tolerance in alkaline solutions proves that bi-Fe Pc/RGO nanocomposite could be considered as a promising cathode catalyst for alkaline fuel cells.
基金financial support from the National Natural Science Foundation of China(Nos.21625501,21936001)the Beijing Outsta nding Young Scie ntist Program(No.BJJWZYJH01201910005017).
文摘Chromatography theory shows that when the inner diameter of the chromatography column is very narrow(e.g.,1—2μm),the maximum efficiency will be produced in liquid chromatography.In addition,the increasing demand for ultrasmall volume sample analysis has produced the trend of narrowing the diameter of the liquid chromatography column.Experiments have verified that ultranarrow-bore open tubular liquid chromatography(i.d.≤2μm)has the advantages of small sample requirement and high separation efficiency.However,there also exist huge challenges along with such obvious advantages.This review summarizes the efforts made by our research group and other research groups to develop this field.We hope that in the near future,ultranarrow bore open-tube liquid chromatography can be successfully and maturely applied to the application of analytes with ultrasmall size and volume such as single-cell and even subcellular organelles omics research.
