Surface engineering of hierarchical platinum-cobalt nanowires for efficient electrocatalysis

Bu, Lingzheng; Guo, Shaojun; Zhang, Xu; Shen, Xuan; Su, Dong; Lü, Gang; Zhu, Xing; Yao, Jianlin; Guo, Jun; Huang, Xiaoqing

doi:10.1038/ncomms11850

Cited by 629 publications

(485 citation statements)

References 52 publications

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“…The thickness of PtPdCo NRs is determined to be 1.8 nm by AFM image ( Figure S2, Supporting Information), also confirmed by analyzing the NRs vertical on the TEM grid ( Figure S3, Supporting Information). [32,33] The composition of Pt/Pd/Co in NRs is estimated to be 47/41/12 by the TEM energy-dispersive X-ray spectroscopy (TEM-EDS) ( Figure 1D), in line with the result from inductively coupled plasma-atomic emission spectroscopy (ICP-AES, 48/41/11). The main diffraction peaks of PtPdCo are located between those of fcc Pt (JCPDS No.…”

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confidence: 61%

Ultrathin PtPd‐Based Nanorings with Abundant Step Atoms Enhance Oxygen Catalysis

et al. 2018

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The lack of highly active and stable catalysts with low Pt usage for the oxygen reduction reaction (ORR) is a major barrier in realizing fuel cell-driven transportation applications. A general colloidal chemistry method is demonstrated for making a series of ultrathin PtPdM (M = Co, Ni, Fe) nanorings (NRs) for greatly boosting ORR catalysis. Different from the traditional ultrathin nanosheets, the ultrathin PtPdM NRs herein have a high portion of step atoms on the edge, high Pt utilization efficiency, and strong ligand effect from M to Pt and fast mass transport of reactants to the NRs. These key features make them exhibit greatly enhanced electrocatalytic activity for the ORR and the oxygen evolution reaction (OER). Among all the PtPdM NRs, the PtPdCo shows the highest ORR mass and specific activities of 3.58 A mg and 4.90 mA cm at 0.9 V versus reversible hydrogen electrode (RHE), 23.9 and 24.5-fold larger than those of commercial Pt/C in alkaline electrolyte, respectively. The theoretical calculations reveal that the oxygen adsorption energy (E ) can be optimized under the presence of step atoms exposed on the edge and ligand effect induced by Co. They are stable under ORR conditions with negligible changes after 30 000 cycles.

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confidence: 61%

Ultrathin PtPd‐Based Nanorings with Abundant Step Atoms Enhance Oxygen Catalysis

et al. 2018

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“…To address this challenge, a lot of work has been conducted on the development of electrocatalysts toward the cathodic oxygen reduction reaction (ORR) for PEMFC applications over the past decades [1], and mass activities of above 30 times over the commercial Pt/C catalyst have been reported [2,3,4]. However, due to the complex environment and unclear behaviour in operating electrodes, many novel electrocatalysts show poor performance in actual PEMFC operation despite much improved intrinsic catalytic activities demonstrated by the liquid half-cell measurement.…”

Section: Introductionmentioning

confidence: 99%

Annealing Behaviour of Pt and PtNi Nanowires for Proton Exchange Membrane Fuel Cells

Mardle

2018

Materials

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PtNi alloy and hybrid structures have shown impressive catalytic activities toward the cathodic oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs). However, such promise does not often translate into improved electrode performances in PEMFC devices. In this contribution, a Ni impregnation and subsequent annealing method, translatable to vertically aligned nanowire gas diffusion electrodes (GDEs), is shown in thin-film rotating disk electrode measurements (TFRDE) to enhance the ORR mass activity of Pt nanowires (NWs) supported on carbon (Pt NWs/C) by around 1.78 times. Physical characterisation results indicate that this improvement can be attributed to a combination of Ni alloying of the nanowires with retention of the morphology, while demonstrating that Ni can also help improve the thermal stability of Pt NWs. These catalysts are then tested in single PEMFCs. Lower power performances are achieved for PtNi NWs/C than Pt NWs/C. A further investigation confirms the different surface behaviour between Pt NWs and PtNi NWs when in contact with electrolyte ionomer in the electrodes in PEMFC operation. Indications are that this interaction exacerbates reactant mass transport limitations not seen with TFRDE measurements.

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“…Therefore, the main issue of PtM NWs for ORR is the trade-off between activity and durability, making them impractical for fuel cell devices. In this regard, creating a new class of PtM NWs with high Pt utilization, catalytic activity, and durability is highly desirable, but remains a great challenge [74,75,93]. One representative work in this field was conducted by Li et al [71].…”

Section: D Structure With High-index Facetsmentioning

confidence: 99%

Rational Design and Synthesis of Low-Temperature Fuel Cell Electrocatalysts

Tian

Yang

et al. 2018

Electrochem. Energ. Rev.

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Recent progresses in proton exchange membrane fuel cell electrocatalysts are reviewed in this article in terms of cathodic and anodic reactions with a focus on rational design. These designs are based around gaining active sites using model surface studies and include high-index faceted Pt and Pt-alloy nanocrystals for anodic electrooxidation reactions as well as Pt-based alloy/core-shell structures and carbon-based non-precious metal catalysts for cathodic oxygen reduction reactions (ORR). High-index nanocrystals, alloy nanoparticles, and support effects are highlighted for anodic catalysts, and current developments in ORR electrocatalysts with novel structures and different compositions are emphasized for cathodic catalysts. Active site structures, catalytic performances, and stability in fuel cells are also reviewed for carbon-based non-precious metal catalysts. In addition, further developmental perspectives and the current status of advanced fuel cell electrocatalysts are provided.

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Surface engineering of hierarchical platinum-cobalt nanowires for efficient electrocatalysis

Cited by 629 publications

References 52 publications

Ultrathin PtPd‐Based Nanorings with Abundant Step Atoms Enhance Oxygen Catalysis

Ultrathin PtPd‐Based Nanorings with Abundant Step Atoms Enhance Oxygen Catalysis

Annealing Behaviour of Pt and PtNi Nanowires for Proton Exchange Membrane Fuel Cells

Rational Design and Synthesis of Low-Temperature Fuel Cell Electrocatalysts

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