Improvement in oxygen reduction activity of polypyrrole-coated PtNi alloy catalyst prepared for proton exchange membrane fuel cells

Hyun, Kyuhwan; Lee, Jin Hee; Yoon, Chang Won; Cho, Yong‐Hun; Kim, Lae-Hyun; Kwon, Yongchai

doi:10.1016/j.synthmet.2014.02.003

Cited by 25 publications

(6 citation statements)

References 32 publications

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“…A preferential orientation towards (200) and (111) directions were observed for both copper and silver crystals. Vegard's law calculations provide estimates for alloying between Ag and Cu to be <3%, 19 this is in good agreement with the minimal shift in diffraction peak positions for the alloys (vs pure Cu and Ag) which indicates a small degree of alloying occurred. Scherrer's equation was used to calculate the average crystallite size to be 23.6 ± 5.8 nm.…”

Section: Resultssupporting

confidence: 72%

Implications of Surface Strain for Enhanced Carbon Dioxide Reduction on Copper-Silver Alloys

Hailu

Shaw

2020

J. Electrochem. Soc.

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The electrochemical reduction of atmospheric carbon dioxide to value added chemicals and fuels using renewable energy is a promising route to a sustainable economy. In this work we present results from the electrochemical reduction of carbon dioxide on copper/silver alloy electrodes alongside pure copper and pure silver in acetonitrile-water electrolyte mixtures. EIS measurements show that the copper/silver alloys exhibit lower charge-transfer resistance when compared to the pure metal electrodes. Reduced product analysis identifies carbon monoxide (CO) as the major product on pure Ag, Ag with alloyed with 10% Cu, and Cu alloyed with 10% Ag with Faradaic efficiencies over 60%. Formate is the major reduced product close to the 50:50 (Cu:Ag) ratio with Faradaic efficiencies exceeding 30%. Our results suggest that changes in the metallic lattice and structural strain of the bimetallic electrodes influences reduced product selectivity.

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Section: Resultssupporting

confidence: 72%

Implications of Surface Strain for Enhanced Carbon Dioxide Reduction on Copper-Silver Alloys

Hailu

Shaw

2020

J. Electrochem. Soc.

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“…1.0 M PBS was used as an electrolyte to promote redox reaction, while high purity N 2 and O 2 and air gases were provided to the electrolyte to create a specific atmosphere. All the tests were performed at room temperature [23,24].…”

Section: Electrochemical Characterizationsmentioning

confidence: 99%

Direct electrochemistry of glucose oxidase immobilized on carbon nanotube for improving glucose sensing

Hyun

Han

Koh

et al. 2015

International Journal of Hydrogen Energy

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“…Conversely, Pt in lower oxidation states most likely acts as catalytic sites for ORR [49]. Nitrogen present additionally facilitates electron transfer to these active sites [50]. Figure 10 further indicates that different active sites are responsible for the two studied reactions, ORR and OER.…”

Section: Bifunctional Performance Assessmentmentioning

confidence: 92%

Optimizing Oxygen Electrode Bifunctionality with Platinum and Nickel Nanoparticle-Decorated Nitrogen-Doped Binary Metal Oxides

Mladenović,

Aykut,

Yurtcan

et al. 2024

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Developing bifunctional oxygen electrode materials with superior activity for oxygen reduction (ORR) and oxygen evolution (OER) reactions is essential for advancing regenerative fuel cell and rechargeable metal–air battery technologies. This present work deals with the synthesis and characterization of electrocatalysts containing Pt and Ni nanoparticles supported on nitrogen-doped mixed metal oxides (Mn2O3-NiO) and the systematic evaluation of their bifunctional ORR/OER performance in an alkaline medium. These electrocatalysts have been successfully synthesized by a simple and fast microwave method. PtNi/Mn2O3-NiO-N with a binary metal oxide-to-N ratio of 1:2 demonstrated the best performance among the studied materials regarding bifunctional electrocatalytic activity (∆E = 0.96 V) and robust stability.

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Improvement in oxygen reduction activity of polypyrrole-coated PtNi alloy catalyst prepared for proton exchange membrane fuel cells

Cited by 25 publications

References 32 publications

Implications of Surface Strain for Enhanced Carbon Dioxide Reduction on Copper-Silver Alloys

Implications of Surface Strain for Enhanced Carbon Dioxide Reduction on Copper-Silver Alloys

Direct electrochemistry of glucose oxidase immobilized on carbon nanotube for improving glucose sensing

Optimizing Oxygen Electrode Bifunctionality with Platinum and Nickel Nanoparticle-Decorated Nitrogen-Doped Binary Metal Oxides

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