Page 143 - Read Online

Page 12 of 31 Chen et al. Microstructures 2023;3:2023025 https://dx.doi.org/10.20517/microstructures.2023.12

Figure 6. (A) A guide map containing four descriptors, MIES, E , E , and Δδ of TiMO as the support for Pt catalysts in fuel cells.
Ovas 1Pt Pt 2
[92]
Reproduced with the permission of Ref. Copyright 2017, Royal Social of Chemistry. (B) Schematic illustrations of the synthesis of
[93]
Pt/TiO NRs catalyst. Reproduced with the permission of Ref. Copyright 2018, Royal Social of Chemistry. (C) Schematic illustrations
2
[95]
of the synthesis of Pt/CeO /CNT junction interface catalyst. Reproduced with the permission of Ref. Copyright 2020, Elsevier. (D)
2
The mass activity (at 0.9V vs. RHE) and half-wave potential of commercial Pt/C, Pt/NC, and Pt/xCeO /NC, (E) LSV curves of
2
[99]
Pt/0.3CeO /NC and commercial Pt/C before and after 10,000 cycles. Reproduced with the permission of Ref. Copyright 2022, Royal
2
Social of Chemistry. (F) Schematic illustrations of the synthesis of Pt/white WO NF and Pt/black WO NF catalysts, (G) Binding
3-x 3-x
[100]
energies of Pt NPs of different sizes supported on WO NFs. Reproduced with the permission of Ref. Copyright 2021, John Wiley
3-x
and Sons.
oxygen, delivering active oxygen species via a spillover process . When the active oxygen species migrate
[94]
to the surface of Pt NPs, the Pt-CeO interfaces will form and accelerate the ORR kinetics. Meanwhile, the
2
oxidation state of Ce can also stabilize the Pt NPs and enhance the durability of Pt/CeO catalysts. Most
3+
2
importantly, the SMSI effect between Pt NPs and CeO support can facilitate the dispersion of Pt NPs and
2
prevent its detachment and aggregation during long-term potential cycling. However, the inferior electronic
conductivity of CeO has been an obstacle to the widespread use of Pt/CeO catalysts in ORR. Similar to
2
2
TiO , the introduction of carbon into Pt/CeO materials to construct Pt/CeO /C triple junction interface
2
2
2
catalysts has been reported to raise the electronic conductivity without affecting the SMSI between Pt-CeO
2
interface (as shown in Figure 6C) [95-97] . With the unique ternary nanostructure, abundant oxygen vacancies,
and SMSI effect advantages, the Pt/CeO /C catalysts exhibit higher ORR performance and durability than
2
commercial Pt/C . Lu et al. reported that CeO /N-C synthesized through a polyol method with an
[98]
2
extremely low Pt content (5%) catalyst (Pt/CeO /N-C) possessed a higher mass activity of 593.6 mA mg
-1
2
pt
[99]
when compared with the commercial Pt/C (97.0 mA mg ) (as shown in Figure 6D) . Meanwhile, the E
-1
pt
1/2