One-Pot Synthesis of Intermetallic Electrocatalysts in Ordered, Large-Pore Mesoporous Carbon/Silica toward Formic Acid Oxidation

Shim, Joongpyo; Lee, Jae-Hyuk; Ye, Youngjin; Hwang, Jongkook; Kim, Soo-Kil; Lim, Tae‐Hoon; Wiesner, Ulrich; Lee, Jun Young

doi:10.1021/nn301692y

Cited by 104 publications

(67 citation statements)

References 64 publications

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“…Although there has been significant progress in the area of catalysts for the ORR, a deeper understanding of the ORR reaction mechanism and the role of the active sites are required for the rational design of mesoporous non-precious-metal and metal-free catalysts with activity, selectivity and stability surpassing those of platinum-based catalysts for commercial fuel cell applications. In addition, mesoporous materials have been developed as anode catalysts for formic acid or methanol oxidation fuel cells 208,209 . For example, noble metal or bimetallic nanocrystallites embedded in ordered mesoporous carbon exhibit high mass activity towards formic acid oxidation 210 .…”

Section: Fuel Cellsmentioning

confidence: 99%

Mesoporous materials for energy conversion and storage devices

2016

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At present, more than 80% of the energy consumed globally is derived from non-renewable fossil fuels such as coal, oil and natural gas. The combustion of these fuels inevitably leads to the emission of CO 2 -a main driver of climate change and other serious environmental effects, including the emission of other dangerous gases. Although mitigating climate change is a multifaceted challenge, one of the pillars of any future low-carbon economy will be a substantially increased dependence on renewable and environmentally friendly energy sources and storage systems. Tremendous progress is being made in developing advanced technologies to meet these challenges. However, to enable the cost-effective, large-scale production of these technologies, further improvement of performance and efficiency is needed. Although unique challenges exist for each technology, the development of functional materials is crucial.Porous solids -in particular, mesoporous solids -are appealing materials in many energy applications owing to their ability to absorb and interact with guest species (including, but not limited to, lithium ions, hydrogen atoms and sulfur molecules) on their outer and inner surfaces, and in the pore spaces 1,2 . According to the International Union of Pure and Applied Chemistry (IUPAC) definition, porous materials are classified into three categories according to their pore sizes: micro porous (<2 nm), mesoporous (2-50 nm) or macro porous (>50 nm). Since the first report of mesoporous silica in the 1990s 3,4 , the variety of mesoporous materials available has rapidly expanded, encompassing a very broad range of compositions.Mesoporous materials have exceptional properties, including ultrahigh surface areas, large pore volumes, tunable pore sizes and shapes, and also exhibit nanoscale effects in their mesochannels and on their pore walls. These features are particularly advantageous for applications in energy conversion and storage [5][6][7][8][9][10] . In principle, high surface areas should provide a large number of reaction or interaction sites for surface or interface-related processes such as adsorption, separation, catalysis and energy storage; however, a high surface area does not necessarily translate to an improved performance in applications. Large pore volumes have shown promise in the loading of guest species and in the accommodation of the expansion and strain relaxation during repeated electrochemical energy storage processes. Uniform and tunable mesopore channels facilitate the transport of atoms, ions and large molecules through the bulk of the material, thereby increasing the number of active sites with high accessibility and overcoming the size restriction encountered with microporous materials. In addition, there are fascinating nanoconfinement effects in the voids of uniform mesochannels, which are advantageous in catalysis and energy storage. 3D nanometre-sized frameworks can produce extraordinary nanoscale effects (that is, surface and quantum effects) that result in mesoporous materials with u...

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Section: Fuel Cellsmentioning

confidence: 99%

Mesoporous materials for energy conversion and storage devices

2016

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“…[1][2][3] In order to develop high performance DFAFCs, there is a great need to fabricate highly efficient electrocatalysts towards formic acid oxidation. Among the metal-based catalysts studied to date, both Pt and Pd-based materials have been widely expected to be the most efficient catalysts for electrochemical oxidation of formic acid.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of PdNi nanowire networks supported on reduced graphene oxide with enhanced catalytic performance for formic acid oxidation

et al. 2015

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This paper reports a simple method, in which Ni nanoparticles act as seeds for the formation of reduced graphene oxide (RGO) supported PdNi nanowire networks. The as-prepared catalysts were characterized by transmission electron microscopy (TEM), high-resolution TEM (HRTEM), X-ray diffraction (XRD) and Xray photoelectron spectroscopy (XPS). Electrochemical measurements proved that the PdNi-NNs/RGO catalyst has superior electrocatalytic activity towards the formic acid oxidation reaction with much larger electrochemically active surface area and mass activity as well as higher long term-stability in comparison with the Pd/RGO and commercial Pd/C catalysts. The optimized ratio of Pd and Ni is 1 : 1, tuned by simply adjusting the feed ratio of the precursors as well. It is proposed that the improvement of the catalytic performance is attributed to the special nanostructure and the synergistic effect between Pd and Ni. These findings highlight the facile synthesis of the PdNi nanowire networks on RGO sheets and their promising application as electrocatalysts for fuel cells.

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Platinum nanoparticles with continuously tunable mesoporous structures were prepared by as imple,o ne-step polymeric approach. [4] Although the synthesis of these large-pore materials have been demonstrated, their compositions are still limited to carbon, [5] silica, [4,6] metal oxides, [7] and organosilicates. In the synthetic method, variation of the solvent composition playsanessential role in the systematic control of pore sizeand particle shape.T he mesoporous Pt catalyst exhibited superior electrocatalytic activity for the methanol oxidation reaction compared to commercially available Pt catalysts.T his polymeric-micelle approach provides an additional design concept for the creation of next generation of metallic catalysts.

Micelle architectures provide as imple and versatile platform for the synthesis of mesoporous structures in aw ide variety of materials.

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mentioning

confidence: 99%

“…[2] Mesoporous materials with large pore sizes have inspired aw ide variety of applications because large pores facilitate fast and efficient transport of reactants. [4] Although the synthesis of these large-pore materials have been demonstrated, their compositions are still limited to carbon, [5] silica, [4,6] metal oxides, [7] and organosilicates. [4] Although the synthesis of these large-pore materials have been demonstrated, their compositions are still limited to carbon, [5] silica, [4,6] metal oxides, [7] and organosilicates.…”

mentioning

confidence: 99%

Tunable‐Sized Polymeric Micelles and Their Assembly for the Preparation of Large Mesoporous Platinum Nanoparticles

et al. 2016

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Platinum nanoparticles with continuously tunable mesoporous structures were prepared by a simple, one-step polymeric approach. By virtue of their large pore size, these structures have a high surface area that is accessible to reagents. In the synthetic method, variation of the solvent composition plays an essential role in the systematic control of pore size and particle shape. The mesoporous Pt catalyst exhibited superior electrocatalytic activity for the methanol oxidation reaction compared to commercially available Pt catalysts. This polymeric-micelle approach provides an additional design concept for the creation of next generation of metallic catalysts.

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One-Pot Synthesis of Intermetallic Electrocatalysts in Ordered, Large-Pore Mesoporous Carbon/Silica toward Formic Acid Oxidation

Cited by 104 publications

References 64 publications

Mesoporous materials for energy conversion and storage devices

Mesoporous materials for energy conversion and storage devices

Facile synthesis of PdNi nanowire networks supported on reduced graphene oxide with enhanced catalytic performance for formic acid oxidation

Tunable‐Sized Polymeric Micelles and Their Assembly for the Preparation of Large Mesoporous Platinum Nanoparticles

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