Cyclic ether on Pt-based carbon support for enhanced alkaline hydrogen evolution

Luo, Xianyou; Xiao, Haoming; Li, Junyi; Yuan, Ping; Du, Baodong; Zheng, Heng; Li, De; Chen, Yong

doi:10.1016/j.jelechem.2023.117476

Cited by 7 publications

(2 citation statements)

References 53 publications

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“…The (5 wt %) Pt/TC catalysts were prepared using the solvothermal reduction method. , In this process, TC x carbon support (50 mg), ethylene glycol (15 mL), and sodium dodecyl benzenesulfonate (100 mg) were combined in a round-bottomed glass flask and dispersed ultrasonically for 10 min. Subsequently, a solution containing chloroplatinic acid hexahydrate (H 2 PtCl 6 ·6H 2 O, 0.039 mL) with a Pt concentration of 63.885 mg mL –1 was added dropwise to the mixture.…”

Section: Methodsmentioning

confidence: 99%

Effects of Intrinsic Defects in Pt-Based Carbon Supports on Alkaline Hydrogen Evolution Reaction

Luo,

Yuan,

Xiao

et al. 2024

ACS Appl. Mater. Interfaces

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Carbon material has widely been utilized in the synthesis of efficient carbon-supported Pt (Pt/C) catalysts, in which the structural properties greatly influence the electrocatalytic performances of Pt/C catalysts. However, the effects of intrinsic defects in carbon supports on the performance of the alkaline hydrogen evolution reaction (HER) have not been systematically investigated. Herein, porous carbon supports with different degrees of intrinsic defects were prepared by a simple template-assisted strategy, and the resulting samples were systematically studied by various analytical methods. The results suggested that the presence of abundant intrinsic defects (vacancy and topological defects) in the carbon support was advantageous in terms of favoring the dispersion and anchoring of Pt species, promoting electron transfer between Pt atoms and the carbon support, and tuning the electronic states of Pt species. These features improved the HER performance of Pt/C catalysts. Compared to the nontemplate-assisted carbon-supported Pt catalyst (Pt/NTC) with an overpotential of 178 mV, the optimized template-assisted carbon-supported Pt catalyst (Pt/TC) exhibited a lower overpotential of 58 mV at 10 mA cm −2 . Besides, the Pt/TC catalyst displayed better HER durability than the Pt/NTC catalyst owing to its strong metal−support interaction. The DFT calculations confirmed the important role played by intrinsic defects (vacancy and topological defects) in stabilizing Pt atoms, with Pt−C3 coordination identified as the most favorable structure for improving the HER performance of Pt. Overall, novel insights on the significant contribution of intrinsic defects in porous carbon supports on the HER performances of Pt/ C catalysts were provided, useful for future design and fabrication of advanced carbon-supported catalysts or other carbon-based electrode materials.

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Section: Methodsmentioning

confidence: 99%

Effects of Intrinsic Defects in Pt-Based Carbon Supports on Alkaline Hydrogen Evolution Reaction

Luo,

Yuan,

Xiao

et al. 2024

ACS Appl. Mater. Interfaces

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“…The double-layer energy storage mechanism enables nanoporous carbon electrode materials with fast dynamic characteristics and splendid physicochemical stability . To improve the capacitance performance, the introduction of defects, including intrinsic defects (such as single or multiple vacancies, edge sites, and dislocations) and external defects (such as oxygen functional groups and doped heteroatoms) has been widely used as an efficient method. − These defects can regulate the electronic configuration of carbon materials to induce more electrochemically active sites suitable for the construction of high-performance electrodes. For instance, Li et al treated commercial graphite through the ball-milling method to form different proportions: basal, edge, and defect surfaces.…”

Section: Introductionmentioning

confidence: 99%

Edge-N-Dominated Nanoporous Carbon as Electrode Materials for Enhanced Performance in Aqueous Supercapacitors

Yuan

Luo

et al. 2023

ACS Appl. Nano Mater.

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N-doped nanoporous carbon (NPC) has widely been used as electrode materials for supercapacitors owing to its high specific capacitance, superior rate capability, and long-life cycling performance. However, exploring the charge distribution mechanism of NPC with various types of N species under different charged states remains challenging. Herein, NPC derived from petroleum coke was prepared by the KOH activation method. The electrochemical testing suggested satisfactory capacitance performance of the as-obtained edge-N-dominated nanoporous carbon. An assembled symmetric supercapacitor device in a 6 M KOH electrolyte delivered a specific capacitance reaching 220 F g–1 at a current density of 1 A g–1, a value 37.5% higher than that obtained by pristine carbon (160 F g–1). The theoretical calculation results demonstrated a high adsorption capacity of edge-N toward K+. The increase in net charge on the electrode materials led to the accumulation of electrons on N-dopants, forming a negative charge center relevant to strengthening K+ adsorption. Overall, insights into the effect of N species on charge distribution in different charged states were provided, conducive to guiding the large-scale development of supercapacitors and other energy storage devices.

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Enhanced Alkaline Hydrogen Evolution Reaction via Electronic Structure Regulation: Activating PtRh with Rare Earth Tm Alloying

Li,

Zhang,

Sun

et al. 2024

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Developing high‐performance electrocatalysts for alkaline hydrogen evolution reaction (HER) is crucial for producing green hydrogen, yet it remains challenging due to the sluggish kinetics in alkaline environments. Pt is located near the peak of HER volcano plot, owing to its exceptional performance in hydrogen adsorption and desorption, and Rh plays an important role in H2O dissociation. Lanthanides (Ln) are commonly used to modulate the electronic structure of materials and further influence the adsorption/desorption of reactants, intermediates, and products, and noble metal‐Ln alloys are recognized as effective platforms where Ln elements regulate the catalytic properties of noble metals. Here Pt1.5Rh1.5Tm alloy is synthesized using the sodium vapor reduction method. This alloy demonstrates superior catalytic activity, being 4.4 and 6.6 times more effective than Pt/C and Rh/C, respectively. Density Functional Theory (DFT) calculations reveal that the upshift of d‐band center and the charge transfer induced by alloying promote adsorption and dissociation of H2O, making Pt1.5Rh1.5Tm alloy more favorable for the alkaline HER reaction, both kinetically and thermodynamically.

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Cyclic ether on Pt-based carbon support for enhanced alkaline hydrogen evolution

Cited by 7 publications

References 53 publications

Effects of Intrinsic Defects in Pt-Based Carbon Supports on Alkaline Hydrogen Evolution Reaction

Effects of Intrinsic Defects in Pt-Based Carbon Supports on Alkaline Hydrogen Evolution Reaction

Edge-N-Dominated Nanoporous Carbon as Electrode Materials for Enhanced Performance in Aqueous Supercapacitors

Enhanced Alkaline Hydrogen Evolution Reaction via Electronic Structure Regulation: Activating PtRh with Rare Earth Tm Alloying

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