Pt–C interactions in carbon-supported Pt-based electrocatalysts

Xiao, Yu‐Xuan; Ying, Jie; Liu, Hongwei; Yang, Xiaoyu

doi:10.1007/s11705-023-2300-5

Cited by 16 publications

(9 citation statements)

References 153 publications

(142 reference statements)

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“…According to the high-resolution Pt 4f spectra (Figure d), Pt in CdS/PtNi, PtNi alloy, and PtNi-sublimed S is mainly present in the form of metallic Pt (Pt 0 ), and the percentages of Pt 0 are 84.0%, 81.8%, and 72.6%, respectively. Notably, a higher Pt 0 content corresponds to a higher stability for the catalyst. − The Pt 0 4f 7/2 peak at 71.6 eV of CdS/PtNi is negatively shifted by 0.2 eV, while PtNi-sublimed S is positively shifted by 0.3 eV compared to the PtNi alloy. However, the Pt 2+ 4f 7/2 and Pt 4+ 4f 7/2 peaks at around 72.6 and 73.8 eV for PtNi-organic S can be assigned to Pt(II)–S and Pt(IV)–S compounds, respectively .…”

Section: Resultsmentioning

confidence: 99%

Interfacial Sulfur-Sensitization of PtNi Nanoalloy for Efficient Electrocatalytic Hydrogen Production in Alkaline Simulated Seawater

Yu,

Xiao,

Chen

et al. 2023

Chem. Mater.

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Optimization of the electronic structure and surface physicochemical properties of PtNi nanoalloys by incorporation of sulfur (S) is an effective strategy for improving the efficiency of the electrocatalytic hydrogen evolution reaction (HER). However, few studies have been carried out to assess the seawater electrocatalytic performance of PtNi by incorporation of interfacial S from CdS nanocrystals. In this study, a simple method is developed to prepare CdS/PtNi, composed of a PtNi alloy supported with CdS quantum dots (QDs). Experimental data demonstrate that interfacial S-sensitization enhances the electron density of PtNi nanoalloy in CdS/PtNi. Therefore, CdS/PtNi exhibits superior performance toward HER in seawater. Specifically, CdS/PtNi displays a low overpotential of 22 mV at a current density of 10 mA cm–2, a higher specific activity of 24.7 mA cm–2 at −0.07 V, and superior durability in seawater, all of which metrics exceed those of commercial Pt/C. Theoretical calculations provide additional evidence that interfacial S-sensitization of PtNi alloy raises electron densities, lowers the d-band center, facilitates water molecule adsorption, resistances to Cl–, and reduces the hydrogen adsorption Gibbs free energy of PtNi alloy. This study provides new opportunities for the design of efficient and stable electrocatalysts for large-scale production of hydrogen from seawater.

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Section: Resultsmentioning

confidence: 99%

Interfacial Sulfur-Sensitization of PtNi Nanoalloy for Efficient Electrocatalytic Hydrogen Production in Alkaline Simulated Seawater

Yu,

Xiao,

Chen

et al. 2023

Chem. Mater.

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“…So far, carbon-supported Pt nanoparticles (NPs) are the most commonly used cathode catalysts in commercial applications. [5] Carbon black is considered the best choice for supporting Pt NPs due to its porous structure, large specific surface area, good electrical conductivity, and low cost among various carbon materials. [6] Various carbon black materials, such as Vulcan XC 72, Black Pearls 2000, Ketjen black EC300 J (KB300), and Denka black, have been developed as supports for Pt catalysts.…”

Section: Introductionmentioning

confidence: 99%

A sulfur‐modified pore‐blocking method to enhance the electrocatalytic stability of carbon‐supported platinum nanoparticles

Xie,

Wang,

et al. 2024

ChemSusChem

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Currently, the durability of electrode materials remains a big obstacle to the widespread adoption of proton exchange membrane fuel cells (PEMFCs). Herein thiourea and sodium dodecyl benzene sulfonate (SDS) were employed as sulfur source and carbon source to modify the pristine carbon black (Ketjen black EC300J). A highly durable carbon supported Pt nanosized catalyst with higher platinum utilization for oxygen reduction reaction (ORR) in PEMFCs was produced by doping elemental sulfur into carbon supports and decreasing the carbon pore sizes and volume through a successive impregnation technique. The catalyst exhibits an initial activity of 0.167 A mgPt‐1 at 0.90 V and demonstrates minimal activity loss after acceleration stress test (30,000 cycles of AST). The half‐wave potential loss for representative sample (Pt/S‐C‐3) is only 14 mV with only 21.8% ECSA decrease, 27.5 % MA loss and 5.9 % SA loss. A sintering test at various temperature shows a minor average size increase for sulfur‐doped carbon (S‐C) supported one (from 2.09 to 2.52 nm). In single‐cell test, the MEA sample employing the platinum catalyst on modified carbon as cathode exhibited almost negligible performance loss after 30,000 cycles of AST.

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“…11 Meanwhile, for carbon-supported Pt-based IMC catalysts, the distribution and growth of metal particles are greatly influenced by the carbon support. 12,13 The interfacial bonding and electron transfer between Pt and carbon are existed, so Pt−C interaction should not be neglected. 14 Currently, theoretical calculations have been used to show the existence of Pt−C interaction.…”

Section: ■ Introductionmentioning

confidence: 99%

Boosting ORR Activity in π-Rich Carbon-Supported Sub-3 nm Pt-Based Intermetallic Electrocatalysts via d–π Interaction

Li,

Lin

et al. 2024

ACS Sustainable Chem. Eng.

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Regulating Pt−C interactions is the key to improving the performance of carbon-supported Pt-based electrocatalysts. However, the surfaces of common commercial carbon supports are relatively inert, and achieving strong bonding with metals remains a challenge. Herein, a simple method is employed to prepare highly dispersed and sub-3 nm PtCo intermetallic compounds (IMCs) supported on π-electron-rich nitrogen-doped petroleum vacuum residue-derived porous carbon (NPPC) for the oxygen reduction reaction (ORR). Strong interaction between the d-orbitals of PtCo particles (NPs) and the π electrons of NPPC significantly optimizes the metal d-orbitals. Such strong d−π interaction and the synergistic effect of pyridinic N further enhance the activity of the catalyst for ORR. The mass activity (MA) of the prepared PtCo/NPPC-800 catalyst (1.77 A mg Pt −1) is experimentally demonstrated to be 11.8 times higher than that of commercial Pt/C (0.15 A mg Pt −1 ) at 0.9 V vs RHE. X-ray photoelectron spectroscopy (XPS) and extended X-ray absorption fine structure (EXAFS) spectra confirm the low degree of π-electron delocalization of NPPC and highstrength Pt−C bonding. This work greatly improves the high value-added utilization of heavy oil and also provides new insights into the preparation of small-sized Pt-based IMC catalysts for ORR.

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Pt–C interactions in carbon-supported Pt-based electrocatalysts

Cited by 16 publications

References 153 publications

Interfacial Sulfur-Sensitization of PtNi Nanoalloy for Efficient Electrocatalytic Hydrogen Production in Alkaline Simulated Seawater

Interfacial Sulfur-Sensitization of PtNi Nanoalloy for Efficient Electrocatalytic Hydrogen Production in Alkaline Simulated Seawater

A sulfur‐modified pore‐blocking method to enhance the electrocatalytic stability of carbon‐supported platinum nanoparticles

Boosting ORR Activity in π-Rich Carbon-Supported Sub-3 nm Pt-Based Intermetallic Electrocatalysts via d–π Interaction

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