Annealing‐Free Platinum−Cobalt Alloy Nanoparticles on Nitrogen‐Doped Mesoporous Carbon with Boosted Oxygen Electroreduction Performance

Huang, Kai; Xu, Pengfu; He, Xian; Wang, Ruyue; Wang, Yonggang; Yang, Han; Zhang, Ru; Lei, Ming; Tang, Haolin

doi:10.1002/celc.202000830

Cited by 6 publications

(2 citation statements)

References 42 publications

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“…In order to overcome this challenge and maximize the usage, activity, and durability of platinum, this work combines the benefits of all of these strategies to synthesize a shape-controlled cobalt-doped Pd@Pt catalyst. The focus is on Pd@Pt core@shell NPs due to their unique structure, which modifies the structural and electronic properties of Pt, resulting in significant mass activity and durability toward ORR. , Cobalt is also chosen as the dopant because of its substantial role in increasing the durability of Pt-based catalysts. – Octahedral Pd@Pt is also reviewed and confirmed to have the highest ORR performance among all other facets. , To the best of our knowledge, this is the first time that cobalt has been used as a metal dopant in a Pd@Pt core–shell structure to enhance both the activity and durability. By combining synthetic efforts, electrochemical measurements and ex-situ and in situ synchrotron-based X-ray absorption spectroscopy (XAS), the study demonstrates that the cobalt-doped Pd@Pt NP is an effective and state-of-the-art electrocatalyst for ORR, due to its simultaneous remarkable electrocatalytic activity and superior stability with respect to undoped NPs and commercial Pt/C catalysts.…”

Section: Introductionmentioning

confidence: 99%

Cobalt-Doped Pd@Pt Core–Shell Nanoparticles: A Correlative Study of Electronic Structure and Catalytic Activity in ORR

Feizabadi,

Chen,

Banis

et al. 2023

J. Phys. Chem. C

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Platinum (Pt) is a critical catalytic component used in polymer electrolyte membrane fuel cells. However, its low abundance, limited supply, and increasing demand have limited the commercial applications of this metal. One of the most recent ways to meet these demands is to utilize Pt-based bimetallic nanoparticles. Using the Pt metal as the shell material of the catalyst not only increases the surface area but also creates an interfacial interaction between the core metal and platinum, which results in enhanced catalytic activity. Recently, octahedral Pd@Pt nanoparticles with controllable Pt shells have been shown to exhibit greatly enhanced activity and durability compared to commercial Pt/C. In this study, Pd@Pt nanoparticles will be surface doped with cobalt to further boost their durability and activity. Characterizing the synthesized catalyst with X-ray absorption fine structure at the Pt L3-edge and cobalt K-edges, together with performance tests, has revealed information about the effect of the dopants on the catalytic activity of catalysts. The results of the local and electronic structures of the catalysts are correlated with electrocatalytic activity to optimize performance. Cobalt has been found to be simultaneously efficient in enhancing catalytic activity, increasing long-term durability, and reducing the platinum content in the catalysts.

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Section: Introductionmentioning

confidence: 99%

Cobalt-Doped Pd@Pt Core–Shell Nanoparticles: A Correlative Study of Electronic Structure and Catalytic Activity in ORR

Feizabadi,

Chen,

Banis

et al. 2023

J. Phys. Chem. C

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“…One strategy is to make a Pt alloy catalyst, which boosts the ORR catalytic activity and lessens the quantity of Pt. Several studies have explored the Pt-M (Pt-metal) alloy catalysts, for example, Pt-Co, ,− Pt-Ni, and Pt-Fe . Stamenkovic et al studied the relationship between the experimentally determined surface electronic structure (d-band center) and ORR activity of Pt-M (M = Ni, Co, Fe, Ti, V) .…”

Section: Introductionmentioning

confidence: 99%

High Activity of Platinum-Cobalt Supported by Natto-like N-Doped Carbon Sphere as Durable Catalyst for Oxygen Reduction Reaction

et al. 2021

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This study demonstrates a platinum and cobalt alloy (PtCo) supported by natto-like N-doped carbon spheres (n-NCS), denoted as PtCo/n-NCS, showing excellent catalytic activity and high durability for the oxygen reduction reaction (ORR). PtCo/n-NCS demonstrate the electron-transfer number of 3.98 and only the decay of 53 mV on half-wave potential after 30 000 cycles. PtCo/n-NCS contribute a high Pt mass activity of 823.01 mA mg Pt −1 at 0.80 V, compared to Pt/C and PtCo/C with 105.46 and 235.20 mA mg Pt −1 , respectively. n-NCS provide a large surface area to increase NCS for the utilization of PtCo catalysts and a large amount of the graphitic-N structures to enhance the four-electron transfer. Therefore, PtCo/n-NCS have a superior ORR activity, making them the promising catalysts for the ORR.

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Co‐N as a Promoter towards Modulation Surface Chemistry of PtCo Alloy on 2D Thin Layer Hierarchical Porous Nitrogen‐Carbon for the Efficient Oxygen Reduction Reaction

et al. 2022

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To clarify the mechanism of active site conversion and utilization of the Pt−M alloy complexed with nitrogen‐doped carbon (NC) catalysts (Pt−M/NC) for oxygen reduction reaction (ORR), we synthesized the two‐dimensions thin‐layer hierarchical porous nitrogen‐carbon for supporting PtCo nanoparticles (2D PtCo/TNC) and applied to alkaline ORR. The self‐assembled thin layer of carbon nitride (TL‐C3N4) was thermally fused with commercial carbon black (C) to form a 2D‐TNC, which can conduct the optimal mass transfer. Therewith, PtCo nanoparticles were anchored on this carrier through a thermal injection strategy, promoting the formation of Co−N and achieving low Pt loading (2 wt%). As a promoter, the Co−N favours the lattice distortion of PtCo alloys and facilitates the in‐situ adsorption‐diffusion process of oxygen‐containing species. Thus, the obtained catalyst demonstrates an excellent ORR activity in alkaline electrolytes, with a half‐wave potential (E1/2) of 0.885 V and electrochemical active surface area (ECSA) of 111 m2/g, lower Tafel slope of 66 mV/dec.

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Annealing‐Free Platinum−Cobalt Alloy Nanoparticles on Nitrogen‐Doped Mesoporous Carbon with Boosted Oxygen Electroreduction Performance

Cited by 6 publications

References 42 publications

Cobalt-Doped Pd@Pt Core–Shell Nanoparticles: A Correlative Study of Electronic Structure and Catalytic Activity in ORR

Cobalt-Doped Pd@Pt Core–Shell Nanoparticles: A Correlative Study of Electronic Structure and Catalytic Activity in ORR

High Activity of Platinum-Cobalt Supported by Natto-like N-Doped Carbon Sphere as Durable Catalyst for Oxygen Reduction Reaction

Co‐N as a Promoter towards Modulation Surface Chemistry of PtCo Alloy on 2D Thin Layer Hierarchical Porous Nitrogen‐Carbon for the Efficient Oxygen Reduction Reaction

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