Highly Active Platinum Nanoparticles on Graphene Nanosheets with a Significant Improvement in Stability and CO Tolerance

He, Daping; Cheng, Kun; Li, Huaiguang; Peng, Tao; Xu, Feng; Mu, Shichun; Pan, Mu

doi:10.1021/la2045493

Cited by 96 publications

(72 citation statements)

References 43 publications

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“…424 In a recent study, HRG/Pt nanocomposites prepared with perfluorosulfonic acid (PFSA) as functionalization and anchoring agent, were applied as electrocatalyst for ORR. 425 The PFSA not only enhanced the Pt-graphene interactions and the stability of the catalyst, but also provided more channels for H + towards Pt surfaces, thereby creating more active catalytic sites (cf. Fig.…”

Section: Fuel Cellsmentioning

confidence: 99%

“…The results demonstrated that the graphitic and amino-type of nitrogen components determine the onset potential and electron transfer number, while the total content of graphitic and pyridinic nitrogen atoms is the key factor to enhance the current density in the electrocatalytic activity for ORR. 425 It is clear that graphene-based inorganic nanocomposites show enhanced performance as electrocatalysts in fuel cells compared to the cost-inefficient Pt/C commercial electrocatalysts.…”

Section: Fuel Cellsmentioning

confidence: 99%

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Graphene based metal and metal oxide nanocomposites: synthesis, properties and their applications

et al. 2015

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Section: Fuel Cellsmentioning

confidence: 99%

Section: Fuel Cellsmentioning

confidence: 99%

Graphene based metal and metal oxide nanocomposites: synthesis, properties and their applications

et al. 2015

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“…In many scientific reports graphene oxide (GO) has been used to support Pt nanoparticles, due to oxygen-containing functional groups on both basal planes (epoxy and hydroxyl groups) and edge planes (carbonyl and carboxyl groups). They are usually not single-layer and the presence of oxygen functional groups can act as anchoring sites to attach nanoparticles and enhance the uniform distribution [20,21].…”

Section: Graphenementioning

confidence: 99%

Nitrogen-doped graphene with enhanced oxygen reduction activity produced by pyrolysis of graphene functionalized with imidazole derivatives

Borghei

Azcune

Carrasco

et al. 2014

International Journal of Hydrogen Energy

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Direct methanol fuel cells (DMFC) are great candidates for portable power source applications. However, the sluggish reaction kinetics are key challenges in DMFC technology. The state-of-the-art electrocatalysts are Pt-based catalysts supported on carbon black. However, the high price of Pt, corrosion of carbon support and Pt degradation are the main problems.In this thesis, carbon nanomaterials, namely few-walled carbon nanotubes (FWCNTs) and graphitized nanofibers (GNFs) were used as catalyst supports in the search for stable and durable catalysts. PtRu nanocatalysts with similar particle size and composition were synthesized and deposited on FWCNTs and GNFs. The electrochemical activities for methanol oxidation were compared with that of PtRu-carbon black in acidic conditions. The half-cell electrochemical measurements revealed higher activity with PtRu-GNFs and PtRu-FWCNTs. Later, the electrocatalysts were tested in macro-and micro-DMFC. The results revealed the significant influence of the catalyst support, inomer contect, electrode structure, preparation method, as well as the fuel cell architecture on the performance of a specific electrode material. The results also highlighted the necessity of electrode composition optimization when applying new materials at the electrodes, in order to achieve the best activity and durability for a certain electrocatalyst.A special effort was also done to achieve Pt-free electrocatalysts with high activity for the oxygen reduction reaction (ORR) by introducing nitrogen heteroatoms in carbon nanomaterials, namely FWCNTs and graphite nanoplatelets (GNPs). N-FWCNTs exhibited remarkable electrocatalytic activity for ORR in alkaline media, despite their very low nitrogen content (~0.5 at.%). N-FWCNTs performed on par or better than a commercial Pt-C at the cathode of an alkaline DMFC. The N-GNPs exhibited enhanced electrocatalytic activity for ORR compared to pristine GNPs in alkaline media. The results indicated that N-doped carbon nanomaterials could be promising alternatives to their Pt counterparts to reduce fuel cell costs. However, further investigations are necessary to ascertain the real active sites in order to design more efficient and durable ORR electrocatalysts.Keywords Carbon nanomaterials, PtRu catalysts, nitrogen-doping, direct methanol fuel cell ISBN (printed) 978-952-60-6140-5 ISBN (pdf) 978-952-60-6141-2

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“…For instance, we prepared Na¯on decorated Pt NPs on various supports (e.g., carbon black, carbon nanotube, graphene, nanoceramics, etc. ), [13][14][15][16] which showed much improvement in the ORR mass activity compared to that without Na¯on decoration. However, hitherto, the e®ect of Na¯on on ORR speci¯c is not unknown, and the mechanism of the ÀSO 3 H containing polymer in facilitating the ORR activity remains unclear.…”

Section: Introductionmentioning

confidence: 97%

“…8,9 Normally, approaches to improving the ORR activity include integrating Pt with other transition metals (e.g., Pt-Co, Pt-Pd, Pt-Au), 5,10,11 controlling the size of the Pt nanoparticles (NPs) to increase their speci¯c surface areas (e.g., ultrasmall Pt clusters 5 ) and engineering crystal facets to improve catalytic performance (generally the ORR activity obeys a sequence: Pt ð100Þ >Pt ð111Þ >Pt (110) 12 ). In addition, the strategy of decorating the Pt NPs surface with ÀSO 3 À containing polymers [13][14][15][16] (e.g., per°uorosulfonic acid (PFSA), namely Na¯on r Þ or adopting ÀSO 3 À functionalized supports, 17,18 leads to a much enhanced mass activity of ORR as well as an outstanding stability. For instance, we prepared Na¯on decorated Pt NPs on various supports (e.g., carbon black, carbon nanotube, graphene, nanoceramics, etc.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Specific Activity of Metal Catalysts Toward Oxygen Reduction by Introducing Proton Conductor

Cheng

Liu

et al. 2016

NANO

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Enhancing oxygen reduction reaction (ORR) activity and simultaneously reducing usage of noble metal catalysts are signi¯cantly important both in fundamental and applied science communities for polymer electrolyte fuel cells (PEFCs). In this work, we con¯rm the proton conductor (per-°u orosulfonic acid, containing ÀSO 3 H) can promote the speci¯c activity ðI s Þ of metal catalysts toward ORR. Herein, Pt nanoparticles (NPs) with a small and narrow size distribution are encapsulated with per°uorosulfonic acid through a simple colloidal route. The resulting catalyst obtains about two times ðI s Þ towards ORR than that of the pristine Pt/C. Signi¯cantly, the amount of ÀSO 3 H groups is controlled by a heat-treatment method to investigate the in°uence of ÀSO 3 H groups on ðI s Þ. The results evidence the contribution of ÀSO 3 H groups to elevating the ORR speci¯c activity. The mechanism can be ascribed to the ÀSO 3 H groups which e®ectively promote the transfer process of reaction species (e.g., H þ , H 2 O), improving the triple-phase boundary (TPB).

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Highly Active Platinum Nanoparticles on Graphene Nanosheets with a Significant Improvement in Stability and CO Tolerance

Cited by 96 publications

References 43 publications

Graphene based metal and metal oxide nanocomposites: synthesis, properties and their applications

Graphene based metal and metal oxide nanocomposites: synthesis, properties and their applications

Nitrogen-doped graphene with enhanced oxygen reduction activity produced by pyrolysis of graphene functionalized with imidazole derivatives

Enhancing the Specific Activity of Metal Catalysts Toward Oxygen Reduction by Introducing Proton Conductor

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