Hollow PtCu nanorings with high performance for the methanol oxidation reaction and their enhanced durability by using trace Ir

Shi, Yao‐Cheng; Yan, Fang; Zhang, Genlei; Wang, Xianshun; Cui, Peng; Wang, Qi; Wang, Yuxin

doi:10.1039/c9ta12989h

Cited by 50 publications

(35 citation statements)

References 53 publications

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“…Noble metals like Au, Pt, and Ag have emerged as highly active electrocatalysts compared to other non‐noble metal or metal oxides for methanol oxidation [10a,11b,20–21,30b,43] . However, few bimetallic alloys have been employed in methanol oxidation as cost‐effective catalysts [32b,34–35] . To explore the catalytic properties of the as‐prepared bimetallic Au/Cu nanocrystals were examined for their electrocatalytic efficiency towards the room‐temperature methanol oxidation reaction (MOR).…”

Section: Resultsmentioning

confidence: 99%

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Rational Design of Bimetallic Au/Cu Nanostructure: An Efficient Catalyst for Methanol Oxidation

et al. 2020

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We show the design of noble Au/Cu bimetallic nanostructures by a gentle solution process. Transmission electron microscopy (TEM), X‐ray diffraction (XRD), and X‐ray photoelectron spectroscopy (XPS) analysis confirm the presence of both Au and Cu in the Au/Cu bimetallic nanostructures. The Au/Cu catalyst was explored as an efficient electrocatalyst for methanol oxidation with a current density of 5.71 mA/cm2 at 0.46 V.

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Section: Resultsmentioning

confidence: 99%

“…Shi et al. synthesized Hollow PtCu nanorings which exhibited excellent activity for the methanol oxidation reaction [34] . They found that the durability of Pt 0.75 Cu alloy nanorings for MOR is significantly increased by doping trace Ir.…”

Section: Introductionmentioning

confidence: 99%

Rational Design of Bimetallic Au/Cu Nanostructure: An Efficient Catalyst for Methanol Oxidation

et al. 2020

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“… 63 The efficiency of a catalyst can be judged based on the following parameters: (a) anodic peak current density ( I ap ) at respective anodic potential ( E ap ), (b) onset potential ( E onset ), showing methanol oxidation activity, and (c) the forward to reverse peak current density ( I f / I r ) ratios, reflecting the catalyst tolerance. 64 As can be seen in Table 2 and Table S3 , the I ap of the synthesized catalysts toward MOR is in the order of Pt 1 Cu 1 > Pt 1 Ni 1 > Pt 1 Fe 1 > Pt 1 Zn 1 > Pt 1 Co 1 . The catalysts Pt 1 Cu 1 /PC 950, Pt 1 Ni 1 /PC 950, Pt 1 Fe 1 /PC 950 and Pt 1 Zn 1 /PC 950 have higher I ap values, while Pt 1 Co 1 /PC 950 have comparable I ap values to those of the commercial Pt/C 20% catalyst (0.33 mA cm Pt −2 ).…”

Section: Resultsmentioning

confidence: 85%

Zinc-Coordination Polymer-Derived Porous Carbon-Supported Stable PtM Electrocatalysts for Methanol Oxidation Reaction

et al. 2021

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Porous carbon (PC) is obtained by carbonizing a zinc-coordination polymer (MOF-5) at 950 °C and PtM (M = Fe, Co, Ni, Cu, Zn) nanoparticles (NPs), which are deposited on PC using the polyol method. Structural and morphological characterizations of the synthesized materials are carried out by powder X-ray diffraction (PXRD), X-ray photoelectron spectroscopy (XPS), and high-resolution transmission electron microscopy (HRTEM), and the porosity was determined using a N 2 adsorption/desorption technique. The results revealed that PtM NPs are alloyed in the fcc phase and are well dispersed on the surface of PC. The electrochemical results show that PtM/PC 950 catalysts have higher methanol oxidation reaction (MOR) performances than commercial Pt/C (20%) catalysts. After 3000 s of chronoamperometry (CA) test, the MOR performances decreased in the order of Pt 1 Cu 1 /PC 950 > Pt 1 Ni 1 /PC 950 > Pt 1 Fe 1 /PC 950 > Pt 1 Zn 1 /PC 950 > Pt 1 Co 1 /PC 950. The high MOR activities of the synthesized catalysts are attributed to the effect of M on methanol dissociative chemisorption and improved tolerance of Pt against CO poisoning. The high specific surface area and porosity of the carbon support have an additional effect in boosting the MOR activities. Screening of the first row transition metals ( d 5+ n , n = 1, 2, 3, 4, 5) alloyed with Pt binary catalysts for MOR shows that Pt with d 8 (Ni) and d 9 (Cu) transition metals, in equivalent atomic ratios, are good anode catalysts for alcohol fuel cells.

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“…Significantly, the MOR electrochemical performance of Pt 1 Cu 1 aerogels have been improved after the introduction of Ir, clearly indicating the promoting role of Ir on PtCu in MOR. Moreover, the MOR activity of Pt 1 Cu 1 Ir 0.04 aerogels is far more superior compared with that of the most reported Pt-based catalysts (Figure d). ,,− …”

Section: Resultsmentioning

confidence: 88%

“…introduced to PtCu have been proven to be an efficient strategy to improve the MOR performance . Besides, Ir is the most active non-Pt metal for MOR that has been proven. − Inspired by this, regulating the composition of electrocatalysts has generated enormous effects in improving the MOR stability on account of their electronic/synergistic or geometric effects. − Therefore, the development of highly stable electrocatalysts based on component engineering for MOR deserves extensive researches.…”

Section: Introductionmentioning

confidence: 99%

Trace Iridium as ″Adhesive″ in PtCuIr Aerogels for Robust Methanol Electrooxidation

Fang

Wang

et al. 2021

ACS Sustainable Chem. Eng.

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PtCu-based alloy nanomaterials have shown great potential in methanol oxidation reaction (MOR) owing to the lower cost and good anti-poisoning ability. However, the dissolution of non-precious metal makes them suffer from severe stability issues, greatly impeding the practical application of direct methanol fuel cells. Herein, PtCuIr aerogels are successfully fabricated through a one-step NaBH 4 reduction strategy to anchor trace Ir on PtCu aerogels based on compositional engineering, which serves as advanced electrocatalysts to achieve enhanced electrocatalytic performance toward MOR. Particularly, the optimized PtCuIr aerogels show extraordinary stability and the mass activity maintains 71.2% of the initial value after 20,000 s chronoamperometric measurements. Density functional theory calculations certify that the doping of trace Ir considerably lowers the adsorption energy of CO-containing substances and thus enhances the MOR activity. By employing the vacancy formation energy of the surface Pt as the descriptor, it is revealed that the robust stability of PtCuIr aerogels originates mainly from the stronger bond between Ir and Pt/Cu atoms, where Ir acts as an ″adhesive″ to prevent the dissolution and leaching of atoms. The breakthrough of the highly stable MOR catalyst could open an avenue for affordable and durable fuel cells.

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Hollow PtCu nanorings with high performance for the methanol oxidation reaction and their enhanced durability by using trace Ir

Abstract: Cu atoms and a hollow structure are helpful for the improvement of the MOR activity of Pt. Trace Ir atoms might promise a superior durability for the Pt-based catalysts while maintaining the MOR catalytic activity.

Cited by 50 publications

References 53 publications

Rational Design of Bimetallic Au/Cu Nanostructure: An Efficient Catalyst for Methanol Oxidation

Rational Design of Bimetallic Au/Cu Nanostructure: An Efficient Catalyst for Methanol Oxidation

Zinc-Coordination Polymer-Derived Porous Carbon-Supported Stable PtM Electrocatalysts for Methanol Oxidation Reaction

Trace Iridium as ″Adhesive″ in PtCuIr Aerogels for Robust Methanol Electrooxidation

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