N-doped carbon modified Pt/CNTs synthesized by atomic layer deposition with enhanced activity and stability for methanol electrooxidation

Yang, Huimin; Zhang, Baiyan; Zhang, Bin; Gao, Zhe; Qin, Yong

doi:10.1016/s1872-2067(18)63066-9

Cited by 13 publications

(4 citation statements)

References 34 publications

(34 reference statements)

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“…ALD exhibits unique advantages in designing and fabricating advanced catalysts. − For example, we studied the spillover-promoted synergistic effect of bicomponent catalysts by designing a series of single-component TiO 2 /Pt, closely contacting CoO x Pt/TiO 2 , spatially separated CoO x /TiO 2 /Pt, and CoO x /TiO 2 /Pt/TiO 2 and Al 2 O 3 /CoO x /TiO 2 /Pt through a template-assisted ALD strategy (Figure a). The CoO x -Pt proximity in the CoO x /TiO 2 /Pt catalysts was precisely controlled by adjusting the thickness of the TiO 2 layer.…”

Section: Utilization Of the Spillover Effect In Catalysismentioning

confidence: 99%

Spillover in Heterogeneous Catalysis: New Insights and Opportunities

2021

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Spillover is a well-known phenomenon in heterogeneous catalysis and is involved in many important reactions. The establishment of the spillover concept opened up a new research field for an in-depth understanding of the dynamic behavior of migrated species on a catalyst surface. However, a comprehensive understanding of spillover remains lacking. In recent years, the development of advanced characterization techniques in combination with well-controlled synthesis methodologies has provided us with increasing worthwhile information about spillover. This Review mainly describes recent progress on the characterization and mechanism of hydrogen spillover and how to effectively utilize the spillover effect for enhanced catalytic performance. Additionally, the challenges remaining in this research area are discussed, and possible research directions for the future are proposed.

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Section: Utilization Of the Spillover Effect In Catalysismentioning

confidence: 99%

Spillover in Heterogeneous Catalysis: New Insights and Opportunities

2021

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“…Doping carbon materials with nitrogen benefits the dispersion of Pt nanoparticles as well [46,47]. Stambula et al [48] synthesized N-doped graphene by heating graphene at 900 °C in an NH3/Ar atmosphere.…”

Section: The Effect Of Carbon Supports On the Ald Processmentioning

confidence: 99%

“…Porous carbon films can be obtained by carbonizing organic polymer films at a high temperature in an inert or H2 atmosphere. Qin et al [47] overcoated porous N-doped carbon films on a Pt/CNT catalyst by carbonizing ALD polyimide films at 600 °C for 2 h in 5% H2/N2. The activity and stability of the catalyst toward methanol electrooxidation were remarkably enhanced due to the protective effect of the overcoated porous carbon films [47].…”

Section: Enhancing the Stability Of Pt Electrocatalysts By The Ald Mementioning

confidence: 99%

Application of atomic layer deposition in fabricating high-efficiency electrocatalysts

Yang

Chen

Qin

2020

Chinese Journal of Catalysis

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Electrocatalysis is a promising approach to clean energy conversion due to its high efficiency and low environmental pollution. Noble metal materials have been studied to show high activity toward electrocatalyltic reactions, although such applications remain restricted by the high cost and poor durability of the noble metals. By precisely adjusting the catalyst composition, size, and structure, electrocatalysts with excellent performance can be obtained. Atomic layer deposition (ALD) is a technique used to produce ultrathin films and ultrafine nanoparticles at the atomic level. It possesses unique advantages for the controllable design and synthesis of electrocatalysts. Furthermore, the homogenous composition and structure of the electrocatalysts prepared by ALD favor the exploration of structure-reactivity relationships and catalytic mechanisms. In this review, the mechanism, characteristics, and advantages of ALD in fabricating nanostructures are introduced first. Subsequently, the problems associated with existing electrocatalysts and a series of recently developed ALD strategies to enhance the activity and durability of electrocatalysts are presented. For example, the deposition of ultrafine Pt nanoparticles to increase the utilization and activity of Pt, fabrication of core-shell, overcoat, nanotrap, and other novel structures to protect the noble-metal nanoparticles and enhance the catalyst stability. In addition, ALD developments in synthesizing non-noble metallic electrocatalysts are summarized and discussed. Finally, based on the current studies, an outlook for the ALD application in the design and synthesis of electrocatalysts is presented.

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“…Therefore, a method to improve the catalytic activity based on the reduction of the amount of the Pt precious metal for DMFCs is still one of the key issues that needs to be focused. Currently, DMFC studies mainly include the preparation of Pt-based alloys (e.g., PtRu, PtCo, PtNi) [3][4][5] , Pt-based catalysts with special morphology (hollow structure, core-shell structure, nanowires) [6][7][8] , and the selection of a support with a high specific surface area, conductivity, and stability [9][10][11] to reduce catalyst costs and improve catalyst performance. As the support material considerably affects the particle size, morphology, and dispersion of the catalyst, the selection and development of support materials with good performance is one of the research hotspots.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Functionalized Graphene Multilayer Composite Films Supported Pt Catalyst and its Electro-Oxidation for Methanol

Luo

Yin

Xia

2020

MSF

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The multilayer composite films consisting of poly (diallyldimethylammonium chloride) functionalized graphene (PDDA-rGO) and phosphomolybdic acid functionalized graphene (PMo12-rGO) were prepared by layer-by-layer self-assembly method. The {PDDA-rGO/PMo12-rGO}n multilayer composite films were used as a support for electro-deposition of Pt particles in situ. Cyclic voltammetry (CV), X-ray photoelectron spectroscopy and scanning electron microscopy were employed for examining the composition, structure, and morphology of the catalyst. Results revealed that the Pt/{PDDA-rGO/PMo12-rGO}n catalyst is successfully prepared and that the multilayer composite films support improves the dispersion of the Pt particles. CV and chronoamperometry were employed to evaluate the electrocatalytic performance for methanol oxidation. Results revealed that the electrocatalytic activity and stability of the Pt/{PDDA-rGO/PMo12-rGO}3 catalyst for methanol oxidation are considerably improved in comparison with that of the Pt/GCE catalyst. The current density for the oxidation of methanol increased from 0.66 mA/cm2 to 1.21 mA/cm2. In addition, the ratio of the forward current density to the backward current density (If/Ib) was 1.92 for Pt/{PDDA-rGO/PMo12-rGO}3 catalyst, corresponding to 1.3 times that of the Pt/GCE catalyst. This result indicated that the multilayer composite films remarkably enhanced the electrocatalytic activity regarding methanol oxidation.

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N-doped carbon modified Pt/CNTs synthesized by atomic layer deposition with enhanced activity and stability for methanol electrooxidation

Cited by 13 publications

References 34 publications

Spillover in Heterogeneous Catalysis: New Insights and Opportunities

Spillover in Heterogeneous Catalysis: New Insights and Opportunities

Application of atomic layer deposition in fabricating high-efficiency electrocatalysts

Preparation of Functionalized Graphene Multilayer Composite Films Supported Pt Catalyst and its Electro-Oxidation for Methanol

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