First-principles studies of enhanced oxygen reduction reactions on graphene- and nitrogen-doped graphene-coated platinum surfaces

Nam, Ho Ngoc; Phung, Quan Manh; Choeichom, Pongpol; Yamauchi, Yusuke; Saito, Nagahiro

doi:10.1039/d4cp00269e

Cited by 2 publications

(1 citation statement)

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“…Altogether, the increase in the catalytic activity could be attributed to the following factors: (1) The smaller size of the deposited Pt NPs results in an increase of the ECSA and therefore an increase of the number of active sites for the MOR. (2) The presence of the nitrogen atom affects the d-band center , of deposited Pt NPs, inducing a better adsorption of hydroxide moieties at the surface at a lower potential. (3) The presence of nitrogen atoms could alter the electron density of the Pt NPs .…”

Section: Resultsmentioning

confidence: 99%

Pt Nanoparticles Electrodeposited on an Ultrathin Nitrogen-Rich Underlayer for Methanol Sensors

Le,

Nguyen,

et al. 2024

ACS Appl. Nano Mater.

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Developing highly efficient nanoscale catalysts for the methanol oxidation reaction (MOR) remains crucial for advancements in methanol detection across various applications, from fuel cells to fermented beverage analysis. This study explores the potential of using nanometer-thick, nitrogen-rich organic layers as functional hosting carpets to improve the catalytic activity of electrodeposited platinum nanoparticles (Pt NPs). We demonstrate that strategically engineering the nitrogen content within these layers allows for modulation of the Pt nanoparticle size and, consequently, their catalytic performance. Notably, a nanometerthick triazole-based layer facilitates the generation of Pt NPs exhibiting good mass activity (122 A•g −1 ), and more importantly, high CO tolerance (I F /I B ratio of 11.6). Additionally, the resulting electrode displays a broad linear range for methanol detection (10 μM−1 M), with a low detection limit (3.8 μM) and high sensitivity (275 mA•mM − •cm Pt −2 ).

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Section: Resultsmentioning

confidence: 99%

Pt Nanoparticles Electrodeposited on an Ultrathin Nitrogen-Rich Underlayer for Methanol Sensors

Le,

Nguyen,

et al. 2024

ACS Appl. Nano Mater.

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Tailored Design of Mesoporous Nanospheres with High Entropic Alloy Sites for Efficient Redox Electrocatalysis

Nandan,

Nara,

Nam

et al. 2024

Advanced Science

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High Entropy Alloys (HEAs) are a versatile material with unique properties, tailored for various applications. They enable pH‐sensitive electrocatalytic transformations like hydrogen evolution reaction (HER) and hydrogen oxidation reactions (HOR) in alkaline media. Mesoporous nanostructures with high surface area are preferred for these electrochemical reactions, but designing mesoporous HEA sis challenging. To overcome this challenge, a low‐temperature triblock copolymer‐assisted wet‐chemical approach is developed to produce mesoporous HEA nanospheres composed of PtPdRuMoNi systems with sufficient entropic mixing. Owing to active sites with inherent entropic effect, mesoporous features, and increased accessibility, optimized HEA nanospheres promote strong HER/HOR performance in alkaline medium. At 30 mV nominal overpotential, it exhibits a mass activity of ≈167 (HER) and 151 A gPt−1 (HOR), far exceeding commercial Pt‐C electrocatalysts (34 and 48 A gPt−1) and many recently reported various alloys. The Mott‐Schottky analysis reveals HEA nanospheres inherit high charge carrier density, positive flat band potential, and smaller charge transfer barrier, resulting in better activity and faster kinetics. This micelle‐assisted synthetic enable the exploration of the compositional and configurational spaces of HEAs at relatively low temperature, while simultaneously facilitating the introduction of mesoporous nanostructures for a wide range of catalytic applications.

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First-principles studies of enhanced oxygen reduction reactions on graphene- and nitrogen-doped graphene-coated platinum surfaces

Abstract: Developing innovative platinum-based electrocatalysts and enhancing their efficiency are crucial for advancing high-performance fuel cell technology. In this study, we employed DFT calculations to provide a theoretical basis for interpreting...

Cited by 2 publications

References 97 publications

Pt Nanoparticles Electrodeposited on an Ultrathin Nitrogen-Rich Underlayer for Methanol Sensors

Pt Nanoparticles Electrodeposited on an Ultrathin Nitrogen-Rich Underlayer for Methanol Sensors

Tailored Design of Mesoporous Nanospheres with High Entropic Alloy Sites for Efficient Redox Electrocatalysis

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