A Chemical Dealloying Approach for Pt Surface-enriched Pt3Co Alloy Nanoparticles as Oxygen Reduction Reaction Electrocatalysts

Chen, Yuanda; Chen, Yongting; Liao, Yuxiang; Chen, Shengli

doi:10.1007/s40242-021-1238-8

Cited by 2 publications

(2 citation statements)

References 44 publications

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“…In Figs. 2a and 2d [38][39][40] Figure 2b shows the TEM image of PtFe/NC, displaying the amorphous carbon structure (the gray area) and PtFe nanoparticles (the black dots) with a particles size of 3.58 ± 1.12 nm. In Fig.…”

Section: Resultsmentioning

confidence: 99%

NC Loaded PtM Alloy from M-NC with Ultralow Pt Loading for Oxygen Reduction Reaction

Feng,

Zhang,

Zhou

et al. 2024

J. Electrochem. Soc.

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Developing low Pt or non-precious metal catalysts for oxygen reduction reaction (ORR) has becoming necessary in recent years. Herein, PtM alloy anchored on nitrogen-doped carbon (PtM/NC, M=Fe, Co) catalyst with ultralow Pt loading (~1 wt%) is prepared from the simple two-process pyrolysis, namely from C to M-NC then to PtM/NC. The as-prepared PtM/NC (M=Fe, Co) shows an excellent ORR catalytic performance with the peak potential and half-wave potential of 0.901 and 0.870 V for PtFe/NC, 0.868 and 0.845 V for Pt3Co/NC. The ORR on PtM/NC (M=Fe, Co) is a mainly direct 4-electron reaction pathway (3.75-3.90) in alkaline solution. Moreover, they possess good methanol tolerance and stability. Synergistic effect of Pt and M together with N species result in the excellent ORR catalytic activity of PtM/NC (M=Fe, Co). The negative shift of Pt binding energy caused by both lattice contraction and electron orbital coupling from M is beneficial for reducing the d-band center of Pt, weakening the oxygen binding energy and enhancing the ORR intrinsic activity of Pt. The strong interactions between NC and PtM alloy are beneficial for anchoring PtM nanoparticles, promoting the stability of catalyst. This work provides a new strategy for preparing ultralow Pt loading catalysts.

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Section: Resultsmentioning

confidence: 99%

NC Loaded PtM Alloy from M-NC with Ultralow Pt Loading for Oxygen Reduction Reaction

Feng,

Zhang,

Zhou

et al. 2024

J. Electrochem. Soc.

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show abstract

“…However, another problem exists, that is, finding the best time for chemical dealloying is difficult and inconvenient for researchers, and how to maintain excellent activity after the optimal time is still worth further exploration. Chen et al 77 tried chemical dealloying methods with different solvents. 1 M HNO 3 , H 3 PO 4 , and CH 3 COOH solutions were used to perform chemical dealloying on the as-synthesized Pt 3 Co/C for 48 h, and it was found that Pt 3 Co/C after dealloying with H 3 PO 4 had the best ORR activity.…”

Section: Dealloying Methods For Energy-conversion Electrocatalysismentioning

confidence: 99%

Progress and prospects of dealloying methods for energy-conversion electrocatalysis

et al. 2023

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A Chemical Dealloying Approach for Pt Surface-enriched Pt3Co Alloy Nanoparticles as Oxygen Reduction Reaction Electrocatalysts

Cited by 2 publications

References 44 publications

NC Loaded PtM Alloy from M-NC with Ultralow Pt Loading for Oxygen Reduction Reaction

NC Loaded PtM Alloy from M-NC with Ultralow Pt Loading for Oxygen Reduction Reaction

Progress and prospects of dealloying methods for energy-conversion electrocatalysis

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