Enhancement of oxygen reduction activity and stability via introducing acid-resistant refractory Mo and regulating the near-surface Pt content

Feng, Shouquan; Lu, Jiajia; Luo, Lin; Qian, Guangfu; Chen, Jinli; Abbo, Hanna S.; Titinchi, Salam J.J.; Yin, Shibin

doi:10.1016/j.jechem.2020.03.063

Cited by 32 publications

(21 citation statements)

References 48 publications

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“…The difference of lattice shrinkage is caused by the alloy formed by Pt and Ni. It will affect the overlapping degree of Pt electron states, causing a downshift of the d-band center that weakens the adsorption strength of the oxygenated intermediate on the surface of the catalyst, which is beneficial for re-exposure of active sites. − …”

Section: Resultsmentioning

confidence: 99%

Metal–Support Interactions in a Molybdenum Oxide Anchored PtNi Alloy for Improving Oxygen Reduction Activity

Feng

Chen

Qian

et al. 2020

ACS Appl. Energy Mater.

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The PtNi alloy exhibits excellent catalytic activity for oxygen reduction. However, particle agglomeration and support corrosion during the electrochemical reaction inevitably decrease its catalytic stability. Herein, we synthesize PtNi anchored on MoO x (PtNi-MoO x /NC) catalysts by pyrolysis treatment and the ethylene glycol method. It exhibits better catalytic stability than the commercial Pt/C and the prepared PtNiMo ternary catalysts. After the 30k cycle accelerated degradation test, the catalytic activity attenuations for PtNi−MoO 3 /NC and PtNi−MoO 2 /NC are 17 and 24%, respectively, which are lower than that of the commercial Pt/C (59%) and the prepared PtNiMo/NC (70%). The stability enhancement can be attributed to the strong metal−support interactions that effectively restrain the aggregation and shedding of PtNi nanoparticles. This work provides a promising strategy to improve the catalytic stability by introducing insoluble metal oxides as support materials for oxygen reduction reaction.

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Section: Resultsmentioning

confidence: 99%

Metal–Support Interactions in a Molybdenum Oxide Anchored PtNi Alloy for Improving Oxygen Reduction Activity

Feng

Chen

Qian

et al. 2020

ACS Appl. Energy Mater.

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“…In practice, there is a need to increase the stability of PtNi nanomaterials [ 88 ]. This necessity can be achieved by introducing a third element to form a ternary alloy or by modification through surface doping [ 89 , 90 , 91 , 92 , 93 , 94 , 95 ]. The enhanced durability and activity of PtNiCu nanoparticles, relative to octahedral PtNi [ 91 ], seems to reflect the surface elemental distribution of metal components.…”

Section: Alloyed Pt Nanostructuresmentioning

confidence: 99%

“…Relative to PtNi/C and the conventional Pt/C, the superior ORR-performance of Ga−PtNi/C, both during half-cell and single-cell tests, has been attributed to changes in the binding energies of the ORR intermediates, the reduced oxyphilic surface, and the Pt-lattice compression induced by Ga doping. The beneficial role of the doping of PtNi/C with Mo (mostly in the form of oxides) has also been reported [ 90 , 93 , 96 ]. The fact that molybdenum surface dopant preferentially occupies the vertex and edge sites of Mo-PtNi/C results in stabilization of the desired octahedral morphology of PtNi (enriched with exposed (111) facets in acid environment) as well as the increase in concentration of the sub-surface Ni and the stabilized under-coordinated Pt sites, thus preventing their migration and dissolution.…”

Section: Alloyed Pt Nanostructuresmentioning

confidence: 99%

“…The fact that molybdenum surface dopant preferentially occupies the vertex and edge sites of Mo-PtNi/C results in stabilization of the desired octahedral morphology of PtNi (enriched with exposed (111) facets in acid environment) as well as the increase in concentration of the sub-surface Ni and the stabilized under-coordinated Pt sites, thus preventing their migration and dissolution. In addition, the high Ni retention within the PtNi alloy phase and presence of molybdenum oxides at the interface are likely to tune the absorption or desorption energies of the oxygen-containing species, thus inducing the ORR dynamics [ 90 , 93 ].…”

Section: Alloyed Pt Nanostructuresmentioning

confidence: 99%

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Enhancement of Activity and Development of Low Pt Content Electrocatalysts for Oxygen Reduction Reaction in Acid Media

et al. 2021

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Platinum is a main catalyst for the electroreduction of oxygen, a reaction of primary importance to the technology of low-temperature fuel cells. Due to the high cost of platinum, there is a need to significantly lower its loadings at interfaces. However, then O2-reduction often proceeds at a less positive potential, and produces higher amounts of undesirable H2O2-intermediate. Hybrid supports, which utilize metal oxides (e.g., CeO2, WO3, Ta2O5, Nb2O5, and ZrO2), stabilize Pt and carbon nanostructures and diminish their corrosion while exhibiting high activity toward the four-electron (most efficient) reduction in oxygen. Porosity of carbon supports facilitates dispersion and stability of Pt nanoparticles. Alternatively, the Pt-based bi- and multi-metallic catalysts, including PtM alloys or M-core/Pt-shell nanostructures, where M stands for certain transition metals (e.g., Au, Co, Cu, Ni, and Fe), can be considered. The catalytic efficiency depends on geometric (decrease in Pt–Pt bond distances) and electronic (increase in d-electron vacancy in Pt) factors, in addition to possible metal–support interactions and interfacial structural changes affecting adsorption and activation of O2-molecules. Despite the stabilization of carbons, doping with heteroatoms, such as sulfur, nitrogen, phosphorus, and boron results in the formation of catalytically active centers. Thus, the useful catalysts are likely to be multi-component and multi-functional.

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“…are regarded as the most effective catalysts to boost the sluggish kinetics of these reactions [20][21][22][23]. Unfortunately, their high cost, limited reserves, and low stabilities have hindered practical applications [24][25][26][27]. To resolve these issues, lots of researches have been dedicated to minimizing the usage and improving the stability of Pt/Pd-based catalysts [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of noble metal-based intermetallic electrocatalysts by space-confined pyrolysis: Recent progress and future perspective

Zhao

Wang

et al. 2021

Journal of Energy Chemistry

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Enhancement of oxygen reduction activity and stability via introducing acid-resistant refractory Mo and regulating the near-surface Pt content

Cited by 32 publications

References 48 publications

Metal–Support Interactions in a Molybdenum Oxide Anchored PtNi Alloy for Improving Oxygen Reduction Activity

Metal–Support Interactions in a Molybdenum Oxide Anchored PtNi Alloy for Improving Oxygen Reduction Activity

Enhancement of Activity and Development of Low Pt Content Electrocatalysts for Oxygen Reduction Reaction in Acid Media

Synthesis of noble metal-based intermetallic electrocatalysts by space-confined pyrolysis: Recent progress and future perspective

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