Enhanced Electrocatalytic Activity and Durability of Pt Particles Supported on Ordered Mesoporous Carbon Spheres

Zhang, Cheng-Wei; Xu, Lianbin; Shan, Nannan; Sun, Tingting; Chen, Jianfeng; Yan, Yushan

doi:10.1021/cs500107t

Cited by 104 publications

(74 citation statements)

References 52 publications

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“…To improve Pt dispersion, many efforts have been made during the past decades. The support properties prove important for the dispersion of Pt sites, such as the surface properties, porous structures, or surface defect types . Pt loading is also a critical factor, including Pt precursor,, loaded amount, and loading method ,.…”

Section: Figurementioning

confidence: 99%

Pseudo‐single‐atom Platinum Induced by the Promoter Confined in Brucite‐like Lattice for Catalytic Reforming

Zhu

et al. 2016

ChemCatChem

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Pseudo-single atom Pt catalysts have achieved an excellent selectivity to branched paraffins and cycloalkanesi nn-hexaner eforming here. Highly dispersed platinum in single-atom and small clusters made up of severals eparated atoms wasp roduced under the inducemento fSno rZ ra sp romoting components. The Sn or Zr oxides were topologically transformed from layered double hydroxides as precursors, and thus homogeneouslyd ispersed owing to the confinemento ft he brucitelike lattices. The lattice confinementa lso caused the promoter sites charge-transferred, affording electron-rich (Sn) or electron-defected (Zr) sites on the surface, therebyf acilitating the inducement to Pt sites. This strategy provides an effective and feasible alternative for the facile preparation of highly dispersed metal catalysts. In n-hexane reforming, as electivity of up to 95 %t ob ranched paraffins and cycloalkanesw as obtained with the pseudo-single-atomPtcatalysts.The catalytic reforming of straight-chain paraffin to branched paraffin and/orc ycloalkanesi samajor petroleum refining process for the production of high-octaneg asoline. The hydrogenolysis byproducts, however,n eed to be avoided for the atomeconomy.[1] The aromatic compounds are also undesired, as environmental regulations limit the carcinogenic components in gasoline.[2] The reformingp rocess is industrially accomplished by use of supported platinum catalysts.[3] It is critical to enhance the dispersiono fP ta toms for sake of product selectivity.[1b, 4] Large Pt ensemblesh ave been found to be active for the hydrogenolysis to form C1-C5 [5] by the factor of a3Dstruc-ture, the so-called B5 sites.[5b] The 6-fold coordinated step-like sites favor the dehydrocyclization to produce aromatic compounds.[6] To improve Pt dispersion, many efforts have been made during the past decades. The support properties [7] prove important for the dispersiono fP ts ites, such as the surface properties, [7a] porouss tructures, [7b] or surfaced efectt ypes.[7c] Pt loading is also ac ritical factor, [8] including Pt precursor, [8a,b] loaded amount, [8b] and loading method. [8b,c] Strengthening the Pt-support interactions helps improving Pt dispersion as well. [9] The formation of an ew interaction (e.g. Pt-(ONa) x -SiO 2 )b ya ddition of sodium ion [9a] or an enhanced Pt-support interaction by addition of rare earth ions (e.g. Tm)[9b] has improved the dispersion of Pt to cluster size. Addition of Re, Sn, or Ge as promoter is especially efficacious because, in addition to altering the electron density of Pt, [10] the promoter component separates Pt atomsf rom large aggregates by forming Pt x Ma lloys [11] or Pt-promoter oxidesislands. [12] Recently,( pseudo)-single-atom noblem etal catalysts have attracted significant attention owing to their remarkable catalytic properties. [13][14][15][16][17][18] Ac atalystw ith Pt atoms completely exposed to MgO surface has been obtained through am ass-selected soft-landing technique, in which each Pt atom counts for CO oxidation.[13] Isolated A...

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Section: Figurementioning

confidence: 99%

Pseudo‐single‐atom Platinum Induced by the Promoter Confined in Brucite‐like Lattice for Catalytic Reforming

Zhu

et al. 2016

ChemCatChem

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“…Although Vulcan XC-72 carbon black is still a popular support material for ORR catalysts owing to its good dispensability and conductivity, excellent chemical stability in a fuel cell environment and low cost, new types of support are being developed. In this context, Zhang et al [42 ] synthesized the 3D ordered mesoporous carbon sphere arrays (OMCS) by a two-step replication approach, and fabricated OMCS-supported Pt nanoparticles (Pt/ OMCS) through the impregnation-hydrogen reduction method. The durability of Pt/OMCS catalyst is better than Pt/XC-72R and commercial Pt/C catalysts for electrocatalytic reactions.…”

Section: Physical Technologymentioning

confidence: 99%

Recent development in the preparation of nanoparticles as fuel cell catalysts

Zhu

Kim

Tsao

et al. 2015

Current Opinion in Chemical Engineering

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“…They show higher catalytic performance towards ORR compared with the standard Vulcan XC-72 carbon black in many studies [73][74][75]. However, there are still some challenges for their widespread commercial application as PEM fuel cell electrocatalyst supports, mainly because of their higher production cost compared with carbon black.…”

Section: Support Materialsmentioning

confidence: 99%

Recent Progress on the Key Materials and Components for Proton Exchange Membrane Fuel Cells in Vehicle Applications

Wang

Peng

et al. 2016

Energies

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Fuel cells are the most clean and efficient power source for vehicles. In particular, proton exchange membrane fuel cells (PEMFCs) are the most promising candidate for automobile applications due to their rapid start-up and low-temperature operation. Through extensive global research efforts in the latest decade, the performance of PEMFCs, including energy efficiency, volumetric and mass power density, and low temperature startup ability, have achieved significant breakthroughs. In 2014, fuel cell powered vehicles were introduced into the market by several prominent vehicle companies. However, the low durability and high cost of PEMFC systems are still the main obstacles for large-scale industrialization of this technology. The key materials and components used in PEMFCs greatly affect their durability and cost. In this review, the technical progress of key materials and components for PEMFCs has been summarized and critically discussed, including topics such as the membrane, catalyst layer, gas diffusion layer, and bipolar plate. The development of high-durability processing technologies is also introduced. Finally, this review is concluded with personal perspectives on the future research directions of this area.

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Enhanced Electrocatalytic Activity and Durability of Pt Particles Supported on Ordered Mesoporous Carbon Spheres

Cited by 104 publications

References 52 publications

Pseudo‐single‐atom Platinum Induced by the Promoter Confined in Brucite‐like Lattice for Catalytic Reforming

Pseudo‐single‐atom Platinum Induced by the Promoter Confined in Brucite‐like Lattice for Catalytic Reforming

Recent development in the preparation of nanoparticles as fuel cell catalysts

Recent Progress on the Key Materials and Components for Proton Exchange Membrane Fuel Cells in Vehicle Applications

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