导语 前沿科研成果 超低载量铂与单原子MnN4位点桥接促进高效ORR和HER催化 Figure 1. (a) Schematic of preparation process for Pt@Mn-SAs/N-C. b) SEM image c) TEM images of Mn-SAs/N-C. d) SEM image e) TEM image f) HRTEM image and g) ac-STEM image of Pt@Mn-SAs/N-C. h-l) HAADF image and relevant elemental mapping of Pt@Mn-SAs/N-C.(图片来源:ACS Catalysis) Figure 2. (a) XRD patterns of Pt@Mn-SAs/N-C and Mn-SAs/N-C. b) Mn 2p spectra of Pt@Mn-SAs/N-C and Mn-SAs/N-C. c) Pt 4f spectra of Pt@Mn-SAs/N-C. d) XANES and f) EXAFS spectra of Mn K-edge for Pt@Mn-SAs/N-C, Mn foil and Mn2O3. e) XANES and g) EXAFS spectra of Pt L3-edge for Pt@Mn-SAs/N-C, Pt foil and PtO2. WT-EXAFS of Mn K-edge for h) Pt@Mn-SAs/N-C, i) Mn foil and j) Mn2O3.(图片来源:ACS Catalysis) Figure 3. (a)ORR performance in acidic media. a) LSV curves and b) half-wave potentials of Pt@Mn-SAs/N-C, Mn-SAs/N-C, Pt@N-C, N-C and commercial Pt/C catalysts in 0.1 M HClO4 solution. c) Acidic ORR performance comparison of Pt@Mn-SAs/N-C with other reported catalysts, d) Mass activities of Pt@Mn-SAs/N-C and Pt/C catalysts at 0.85 V and 0.9 V. e) Acidic LSV curves of Pt@Mn-SAs/N-C before and after 5000 cycles, and inserted chronoamperometry test of Pt@Mn-SAs/N-C and Pt/C catalysts. f) Methanol tolerance tests of Pt@Mn-SAs/N-C and Pt/C catalysts in acidic media.(图片来源:ACS Catalysis) Figure 4. (a) LSV curves and b) corresponding Tafel slopes of Pt@Mn-SAs/N-C and Pt/C catalysts in acidic media. c) Mass activity of Pt@Mn-SAs/N-C and Pt/C at 20 and 30 mV in 0.5 M H2SO4 solution. d) LSV curves and e) corresponding Tafel slopes of Pt@Mn-SAs/N-C and Pt/C catalysts in alkaline media. f) Mass activity of Pt@Mn-SAs/N-C and Pt/C at 20 and 30 mV in 1 M KOH solution(图片来源:ACS Catalysis) Figure 5. (a) ORR free energy diagram of Mn-SAs/N-C, Pt@Mn-SAs/N-C and Pt models. b) HER Gibbs free energy diagrams of these theoretical models. c) As-constructed model and differential charge density of Pt@Mn-SAs/N-C. d) PDOS of the d orbital of Pt atoms in Pt@Mn-SAs/N-C and Pt models.(图片来源:ACS Catalysis) 课题组简介 教授简介 邀稿 |
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