Chinese Journal of Catalysis ›› 2023, Vol. 45: 17-26.DOI: 10.1016/S1872-2067(22)64165-2
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Xuan Liu, Jiashun Liang, Qing Li()
Received:
2022-07-03
Accepted:
2022-08-14
Online:
2023-02-18
Published:
2023-01-10
Contact:
Qing Li
About author:
Qing Li is a professor of School of Materials Science and Engineering in Huazhong University of Science and Technology (HUST), China. He received his Ph.D. in Chemistry from Peking University in 2010 and then worked as a postdoctoral research associate consecutively at Los Alamos National Laboratory (2011-2013) and Brown University (2013-2015). He joined HUST as a full professor in 2016. He has published more than 160 peer-reviewed papers. His research interests include functional nanomaterials and their applications in electrocatalysis, PEM fuel cells and batteries.
Supported by:
Xuan Liu, Jiashun Liang, Qing Li. Design principle and synthetic approach of intermetallic Pt-M alloy oxygen reduction catalysts for fuel cells[J]. Chinese Journal of Catalysis, 2023, 45: 17-26.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(22)64165-2
Fig. 1. (a) Schematic diagram of the ordering process of L10-PtM iNC through the direct atomic diffusion and vacancy-mediated atomic diffusion. (b) Gibbs free energy diagram of the transition process from a disordered structure to an ordered structure through two different atomic diffusion modes. (c) Schematic diagram of the synthesis to L10-PtZn/Pt. Reprinted with permission from Ref. [32]. Copyright 2020, Wiley-VCH.
Fig. 2. (a) Local density of states projected onto an adsorbate state interacting with the d bands at a surface. (b) Illustration of the effect of tensile strain on the d band center. Reprinted with permission from Ref. [41]. Copyright 2000, Elsevier. (c) Surface d-band projected density of states (PDOS) for (100) plane of L10 and fcc PtCo alloys with one atomic Pt layer shell. Reprinted with permission from Ref. [42]. Copyright 2013, Elsevier. (d) The intermediate structures used in energy decomposition. (e) The energy deconvoluted into the ligand and the strain effect for 1, 2 and 3 Pt layers on fct-Pt-M. Reprinted with permission from Ref. [45]. Copyright 2019, Royal Society of Chemistry.
Fig. 3. (a) HAADF-STEM image of a L10-W-PtCo NP. Inset in (a): corresponding FFT pattern. (b) MA and SA of Pt/C, A1-PtCo/C, L10-PtCo/C, and L10-W-PtCo/C. (c) Correlations between ORR MA and dPt-Pt of the studied catalysts. (d) Average surface strain and the logarithm of the estimated ORR reaction rate on the core-shell NPs. The atomic structures of the NPs are shown in the insets. Reprinted with permission from Ref. [48]. Copyright 2019, Wiley-VCH. (e) Schematic illustration of lattice mismatch between L10-PtZn core and Pt shell. (f) Pt L3 k3-weighted FT-EXAFS spectra of L10-PtZn/Pt-C and Pt foil. (g) ORR polarization curves of Pt/C, A1-PtZn-C, and L10-PtZn-C. (h) MA and SA of Pt/C, A1-PtZn-C, and L10-PtZn-C at 0.9 V. (i) Fuel cell (H2-O2) polarization curves of L10-PtZn/Pt-C and commercial Pt/C. Reprinted with permission from Ref. [32]. Copyright 2020, Wiley-VCH.
Fig. 4. (a) Hysteresis loops of C-L10-PtNi, C-L10-PtNi0.8Co0.2, and C-A1-PtNi0.8Co0.2 NPs. (b) LSV curves of the C-L10-PtNi0.8Co0.2 catalyst before and after stability test. Reprinted with permission from Ref. [34]. Copyright 2019, Wiley-VCH. (c) MA of L10-W-PtCo/C, L10-PtCo/C, A1-PtCo/C and Pt/C before and after ADT. (d) MA of Pt/C and L10-W-PtCo/C at 0.9 ViR-free before and after ADT at 80?°C. (e) Surface energy of studied catalysts. Reprinted with permission from Ref. [48]. Copyright 2019, Wiley-VCH. (f) Fuel cell (H2-O2) polarization curves of L10-PtZn/Pt-C before and after ADT. (g) MA and voltage at 0.8 A cm?2 of L10-PtZn/Pt-C before and after ADT. (h) Vacancy formation energy (Zn) of disordered and ordered PtZn models. Reprinted with permission from Ref. [32]. Copyright 2020, Wiley-VCH. (i) Schematic diagram of correlation between vacancy formation energy and structure formation energy in L10-PtM systems.
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