Low-loading Pt nanoparticles embedded on Ni, N-doped carbon as superior electrocatalysts for oxygen reduction

Wang, Xinliang; Yang, Shaoxuan; Yu, Yihuan; Dou, Meiling; Zhang, Zhengping; Wang, Feng

doi:10.1039/c9cy01654f

Cited by 23 publications

(23 citation statements)

References 26 publications

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“…In addition, the performed calculations have implied strong interactions between Pt clusters and N-doped graphene, thus leading to lower resistance for electron transfers facilitating electrochemical reactions and improving the stability of the catalyst. The improved ORR performance and higher mass activities of Pt electrocatalysts deposited on N-doped carbon supports have also been attributed to beneficial platinum dispersion, in addition to strong metal–support interactions [ 119 , 120 , 121 , 122 , 123 ].…”

Section: Heteroatom Doped Carbon Carriersmentioning

confidence: 99%

Enhancement of Activity and Development of Low Pt Content Electrocatalysts for Oxygen Reduction Reaction in Acid Media

et al. 2021

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Platinum is a main catalyst for the electroreduction of oxygen, a reaction of primary importance to the technology of low-temperature fuel cells. Due to the high cost of platinum, there is a need to significantly lower its loadings at interfaces. However, then O2-reduction often proceeds at a less positive potential, and produces higher amounts of undesirable H2O2-intermediate. Hybrid supports, which utilize metal oxides (e.g., CeO2, WO3, Ta2O5, Nb2O5, and ZrO2), stabilize Pt and carbon nanostructures and diminish their corrosion while exhibiting high activity toward the four-electron (most efficient) reduction in oxygen. Porosity of carbon supports facilitates dispersion and stability of Pt nanoparticles. Alternatively, the Pt-based bi- and multi-metallic catalysts, including PtM alloys or M-core/Pt-shell nanostructures, where M stands for certain transition metals (e.g., Au, Co, Cu, Ni, and Fe), can be considered. The catalytic efficiency depends on geometric (decrease in Pt–Pt bond distances) and electronic (increase in d-electron vacancy in Pt) factors, in addition to possible metal–support interactions and interfacial structural changes affecting adsorption and activation of O2-molecules. Despite the stabilization of carbons, doping with heteroatoms, such as sulfur, nitrogen, phosphorus, and boron results in the formation of catalytically active centers. Thus, the useful catalysts are likely to be multi-component and multi-functional.

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Section: Heteroatom Doped Carbon Carriersmentioning

confidence: 99%

Enhancement of Activity and Development of Low Pt Content Electrocatalysts for Oxygen Reduction Reaction in Acid Media

et al. 2021

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“…Particularly, the synergy of bimetal catalysts with more active and stable sites was reported to exhibit surpassing ORR. [20][21][22][23][24] Among bimetal electrocatalysts, FeCo active sites 25,26 that may reduce the energy barrier of O O bonding and lead to the fourelectron reduction pathway were regarded as one of the active ORR electrocatalysts in fuel cells. Moreover, the Ncoordinated FeCo alloys electrocatalysts could further enhance the ORR activity and long-term durability in both acid and alkaline solution.…”

Section: Introductionmentioning

confidence: 99%

“…According to the earlier reports, 9,11‐19 the development of M‐N‐C (M = transition metals) catalysts was shown to be very promising toward ORR. Particularly, the synergy of bimetal catalysts with more active and stable sites was reported to exhibit surpassing ORR 20‐24 . Among bimetal electrocatalysts, FeCo active sites 25,26 that may reduce the energy barrier of OO bonding and lead to the four‐electron reduction pathway were regarded as one of the active ORR electrocatalysts in fuel cells.…”

Section: Introductionmentioning

confidence: 99%

Core‐shell FeCo N‐doped biocarbons as stable electrocatalysts for oxygen reduction reaction in fuel cells

Liu

Kuo

2020

Int J Energy Res

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A facile route is described for the synthesis of FeCo alloys encapsulated in the N-doped hierarchical carbon shells (denoted as Fe x Co 100-x @N-doped C) by using a combined hydrothermal carbonization of cellulose and NH 3 microwave ammoxidation. Various spectroscopic measurements are used to characterize the physicochemical properties of Fe x Co 100-x @N-doped C samples and their activity as well as stability in the oxygen reduction reaction (ORR) are investigated in alkaline electrolytes. The Fe x Co 100-x @N-doped C samples exhibit the core FeCo bimetals alloying with N (verified by X-ray absorption spectroscopy [XAS] and transmission electron microscopy) and N-doped onto highly porous carbons in the shell (proofed by N 2 adsorption-desorption isotherms and X-ray photoelectron spectroscopy [XPS]). Among the Fe x Co 100-x @N-doped C catalysts, the Fe 50 Co 50 @N-doped C with an atomic alloy ratio of FeCo (1:1) has a higher ORR performance (E onset = −0.05 V vs Ag/AgCl) and a surpassing durability (via a 4-electron ORR route) in comparison to other Fe x Co 100-x @N-doped C and commercial Pt/C catalysts. By XAS and XPS, the formation of Fe-N in the inner core and pyridinic-N on outer shell may be responsible for the superior ORR performance of Fe 50 Co 50 @Ndoped C catalysts. These biomass-derived carbon composites with unique coreshell FeCoN@N-doped porous carbon structure prepared by using a time and energy saving microwave-assisted method could offer a possible cathodic electrode in fuel cell applications.

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“…Carbon-supported platinum nanoparticles are among the most active catalysts for the selective aerobic oxidation of glycerol. Extensive research effort has been devoted to enhance the activity and tune the selectivity of Pt via size effects, promoters, alloying with other metals, − metal oxide, etc. Besides optimizing platinum as an active phase, it is also crucial to modify the support toward the improved metal–support interaction (MSI).…”

Section: Introductionmentioning

confidence: 99%

“…Several pioneering works have employed Me–N–C SACs as supports for improved electrocatalytic activity of noble metals. Fe–N–C has been adopted as supports of Pt for the ORR, benefited from the homogeneous dispersion of Pt and the electronic MSI between Pt and Fe–N–C. , Similarly, Ni–N–C has been reported as a support of Pt NPs outperforming commercial Pt/C at lower Pt loadings . Recently, with the assistance of density functional theory (DFT) calculation, Cu–N–C was determined as a suitable support for lowering the adsorption energy of oxygen on Pt, thereby improving the ORR activity .…”

Section: Introductionmentioning

confidence: 99%

Co–N–C-Supported Platinum Catalyst: Synergistic Effect on the Aerobic Oxidation of Glycerol

Yang

Wang

et al. 2020

ACS Sustainable Chem. Eng.

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Metal-and nitrogen-doped carbon materials (Me− N−C) have received intensive scientific interest as single-atom catalysts (SACs) for electro-and thermocatalytic reactions. In this work, the potential of Me−N−C (Me = Co, Fe, Ni)-wrapped carbon nanotubes (CNTs) as support of platinum nanoparticles (Pt NPs) for base-free oxidation of glycerol was investigated. Codoping of transition metal and nitrogen significantly enhanced the dispersion of Pt, indicating the advantages of the supporting material for noble-metal catalysts. Two-fold improvement of turnover of glycerol was observed over 5Pt/CoNC@CNT compared to 5Pt/CNT under the same reaction conditions. A kinetics study was conducted to understand the role of CoNC as a support of Pt NPs in a wide range of oxygen partial pressure from 0.04 to 0.4 MPa and a range of glycerol concentration from 0.012 to 0.15 wt %. A synergistic effect between Me−N−C, especially Co−N− C, and Pt NPs was revealed. The Co−N−C support facilitated the activation of oxygen and thus enhanced the overall turnover of glycerol oxidation, especially at high glycerol concentrations. This finding suggests a new approach to the high-performance Pt catalysts via introducing SACs as supporting materials that afford auxiliary active sites for the target reaction.

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Low-loading Pt nanoparticles embedded on Ni, N-doped carbon as superior electrocatalysts for oxygen reduction

Abstract: A synergetic catalytic system was built based on Pt NPs and atomic Ni–N–C joint active sites for better ORR electrocatalysis.

Cited by 23 publications

References 26 publications

Enhancement of Activity and Development of Low Pt Content Electrocatalysts for Oxygen Reduction Reaction in Acid Media

Enhancement of Activity and Development of Low Pt Content Electrocatalysts for Oxygen Reduction Reaction in Acid Media

Core‐shell FeCo N‐doped biocarbons as stable electrocatalysts for oxygen reduction reaction in fuel cells

Co–N–C-Supported Platinum Catalyst: Synergistic Effect on the Aerobic Oxidation of Glycerol

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