by Xue Feng Lu, Le Yu, and Xiong Wen (David) Lou

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Presentation transcript:

by Xue Feng Lu, Le Yu, and Xiong Wen (David) Lou Highly crystalline Ni-doped FeP/carbon hollow nanorods as all-pH efficient and durable hydrogen evolving electrocatalysts by Xue Feng Lu, Le Yu, and Xiong Wen (David) Lou Science Volume 5(2):eaav6009 February 15, 2019 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

Fig. 1 Schematic illustration of the formation of Ni-doped FeP/C hollow nanorods. Xue Feng Lu et al. Sci Adv 2019;5:eaav6009 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

Fig. 2 The influence of doping amount on the morphology and structure of MIL-88A. The influence of doping amount on the morphology and structure of MIL-88A. (A to D) FESEM images and (E to H) TEM images of as-prepared (A and E) MIL-88A, (B and F) NM-1, (C and G) NM-2, and (D and H) NM-3. (I) XRD patterns, (J) FTIR spectra, and (K) nitrogen sorption isotherms of MIL-88A, NM-1, NM-2, and NM-3. a.u., arbitrary units. Xue Feng Lu et al. Sci Adv 2019;5:eaav6009 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

Fig. 3 Morphology and structure characterizations of MIL-88A treated with phytic acid. Morphology and structure characterizations of MIL-88A treated with phytic acid. (A to D) FESEM images and (E to H) TEM images of (A and E) PTM, (B and F) PTNM-1, (C and G) PTNM-2, and (D and H) PTNM-3 hollow nanorods. Xue Feng Lu et al. Sci Adv 2019;5:eaav6009 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

Fig. 4 Morphology and structure characterizations of NFP/C-3 hollow nanorods. Morphology and structure characterizations of NFP/C-3 hollow nanorods. (A) XRD pattern, (B) FESEM image, (C) TEM image, (D and E) HRTEM images, (F) line scan of the HRTEM image indicated by the blue rectangle in (E), and (G) elemental mapping. Xue Feng Lu et al. Sci Adv 2019;5:eaav6009 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

Fig. 5 Electrochemical performances of electrocatalysts measured in acidic, neutral, and alkaline solutions. Electrochemical performances of electrocatalysts measured in acidic, neutral, and alkaline solutions. (A) LSV curves, (B) corresponding Tafel slopes, and (C) the capacitive current density ΔJ0.25 V as a function of scan rate in the range of 0.2 to 0.3 V versus RHE in 0.5 M H2SO4 of FeP/C, NFP/C-1, NFP/C-2, and NFP/C-3. LSV curves of FeP/C and NFP/C-3 in (D) 1.0 M PBS and (E) 1.0 M KOH solutions (insets: Tafel slopes). (F) Chronopotentiometry curves at a constant current density of 10 mA cm−2 for 12 hours of NFP/C-3 in 0.5 M H2SO4, 1.0 M PBS, and 1.0 M KOH solutions. Xue Feng Lu et al. Sci Adv 2019;5:eaav6009 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

Fig. 6 XPS and DFT calculation results about the promotion of dopant on the catalytic performances. XPS and DFT calculation results about the promotion of dopant on the catalytic performances. High-resolution XPS spectra of (A and B) Fe 2p and (C and D) P 2p for FeP/C and NFP/C-3; (E) ΔGH* as a function of θH for Pt, FeP, and Ni-doped FeP. (F to H) DFT-calculated electronic structures. (F) the charge density difference on Ni-doped FeP: ρ = ρ[Ni-FeP] + ρ(Fe) − ρ[Ni] − ρ[FeP]; yellow and cyan isosurfaces represent electron accumulation and electron depletion, respectively. (G) Section line and (H) isosurface two-dimensional view. Xue Feng Lu et al. Sci Adv 2019;5:eaav6009 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).