Single-step pyrolytic preparation of Mo2C/graphitic carbon nanocomposite as catalyst carrier for the direct liquid-feed fuel cells

Wang, Ruihong; Yang, Jun; Shi, Keying; Wang, Bo; Wang, Lei; Tian, Guohui; Bateer, Buhe; Tian, Chungui; Shen, Pei Kang; Fu, Honggang

doi:10.1039/c3ra23391j

Cited by 29 publications

(33 citation statements)

References 43 publications

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“…The EOR can be observed on the anodic peak which was located between À0.2 and 0.1 V. It can be seen that the onset potentials were relatively similar for all samples. 9 The results also conrmed that the 20%Pd10%Ni10%Sn deposited on functionalised supports generated higher current density than those on non-functionalised supports. The 20%Pd10%Ni10%Sn/MWCNT sn exhibited the maximum current density or activity (291 mA cm À2 ) and mass activity (4288 mA mg Pd À1 ).…”

Section: Functionalisation Of Carbon-based Supportsmentioning

confidence: 81%

“…1 There are various types of fuels being used in PEMFCs, such as hydrogen gas, formic acid, methanol, ethanol, etc. [7][8][9] High selectivity of the anode catalyst is also important as complete oxidation of ethanol to CO 2 is desired to produce the most electrons from one molecule of ethanol. The conventional hydrogen fuel cell is usually used to deliver high power density, whereas the direct methanol fuel cell (DMFC) is more suitable for low power applications.…”

Section: Introductionmentioning

confidence: 99%

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Effect of acid functionalised carbon supports for Pd–Ni–Sn catalyst on ethanol oxidation reaction

2015

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The sodium borohydride reduction method was employed to prepare a ternary catalyst with an atomic ratio of 20%Pd10%Ni10%Sn impregnated on four carbon supports, Vulcan XC-72R carbon black (CB), functionalised carbon black (CB sn ), multi-walled carbon nanotubes (MWCNTs) and functionalised MWCNTs (MWCNT sn ), to improve the catalytic activity for direct ethanol fuel cells (DEFCs). The acid functionalisation was performed using H 2 SO 4 and HNO 3 . The addition of Ni and Sn metals helped to increase catalytic activity as well as catalyst stability in the ethanol oxidation reaction (EOR). The XRD and XPS results confirmed the presence of Ni(OH) 2 and SnO 2 compounds. The crystalline size was in the range of 6.4 to 7.4 nm for all samples. TEM images of the catalyst on MWCNT sn confirmed that the catalyst particles were uniformly distributed and dispersed with a particle size in the range of 6 nm. This result was consistent with the highest number of active sites investigated by CO chemisorption. This was due to the highly crystalline structure of MWCNT sn . Moreover, the catalyst on MWCNTs exhibited the highest current density (291 mA cm À2 ) for EOR, great catalyst stability, the highest electrochemical surface area (77.155 m 2 g À1 Pd) and excellent CO tolerance.

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Section: Functionalisation Of Carbon-based Supportsmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Effect of acid functionalised carbon supports for Pd–Ni–Sn catalyst on ethanol oxidation reaction

2015

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“…[20,21] This adsorption mode could assist in the preferential formation of alcohols.In recent years, thanks to their unique structures and properties, advanced carbon materials such as carbon nanofibers (CNF), carbon nanotubes (CNT), and graphene have attracted a great deal of attention as possible materials for metal-free heterogeneous catalysts, [22,23] electrochemical energy storage devices, [24] and fuel cells. [25,26] In particular, graphene, a two-dimensional planar carbon material first obtained from graphite in 2004, is regarded as a promising electrocatalytic material. [27,28] Graphene can interact strongly with both transition metals and aromatic compounds: theoretical calculations and experimental results have indicated that some electron transfer may occur between the supported Pt NPs and the graphene support, [29,30] and thanks to the large p system of graphene, guest molecules with p orbitals can be adsorbed readily on its surface by p-p interactions.…”

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confidence: 99%

Selective Hydrogenation of Cinnamaldehyde to Cinnamal Alcohol over Platinum/Graphene Catalysts

Niu

et al. 2014

ChemCatChem

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IntroductionThe selective hydrogenation of a,b-unsaturated carbonyl compounds is of theoretical and practical significance. [1][2][3] For instance, the hydrogenation of cinnamaldehyde (CAL) can produce cinnamal alcohol (COL), hydrocinnamaldehyde (HALD), and/or hydrocinnamal alcohol (HALC; Scheme 1), but the selective production of COL is difficult because the hydrogenation of the C=C bond is thermodynamically favored over that of the C=O moiety. [1,4] Moreover, acetals and other unidentified high-molecular-weight compounds can also be produced in large quantities in these reactions. [4,5] Although much research has already been focused on this issue, the selective hydrogenation of a,b-unsaturated aldehydes remains a challenge.The selective hydrogenation of a,b-unsaturated aldehydes toward the unsaturated alcohol can be achieved with homogeneous catalysts such as metal hydrides, aluminium isopropoxide, and others. [6,7] However, it is desirable to develop an equal-ly selective heterogeneous catalyst as these are easier to handle and separate from the products. To this end, a large number of studies on supported catalysts based on Pt, Rh, Au, Ru, and Pd active phases have been reported. [8][9][10][11][12] Cordier et al. reported that the selectivity for COL production from CAL hydrogenation follows the sequence Os > Ir > Pt > Ru > Rh > Pd, [13,14] a trend that was correlated with the width of the dband of the metal (Pd < Pt < Ir, Os). Many other studies have targeted supported Pt catalysts because of their high activity and moderate selectivity.In addition to the different metals that can be used to control selectivity in CAL hydrogenation processes, the supports may play an important role to define the selectivity. Indeed, differences in activity and selectivity may be obtained by varying the nature of the interaction between the support and nanoparticles (NPs). For instance, the selectivity toward COL production may be enhanced by using reducible oxides such as CeO 2 , [15] MnO 2 , [16] SnO 2 , [17] TiO 2 , [18] and ZnO [19] because of the electron transfer that takes place between these supports and Catalysts made of Pt nanoparticles dispersed on graphene (X wt %Pt/G, X = 2.0, 3.5, and 5.0) were prepared and characterized by XRD, Raman spectroscopy, BET surface area measurements, TEM, and X-ray photoelectron spectroscopy (XPS), and a 3.5 wt % Pt supported on Vulcan Carbon catalyst (3.5 wt %Pt/ VC) was included as a reference. Although the mean Pt nanoparticle size is approximately 4.4 nm for all X wt %Pt/G and 3.5 wt %Pt/VC catalysts, cinnamal alcohol was produced with high selectivity only with the graphene-supported catalysts:92 % conversion and 88 % selectivity toward cinnamal alcohol were obtained with 3.5 wt %Pt/G. This catalyst also showed good stability in recycling tests. The good selectivity observed with the graphene-based catalysts is attributed to the higher fraction of reduced surface Pt 0 atoms seen on the surface of the Pt nanoparticles (determined by XPS). This interpretation is consistent with D...

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“…In fact, it is quite often to observe them display inspiring performances in a variety of lab-scale reactions ranging from hydrogenation to isomerization [6][7][8][9][10]. However, in industrial scale, deactivation is one big issue due to which molybdenum carbides are not yet widely applied.…”

Section: Introductionmentioning

confidence: 98%

MoC x species embedded in ordered mesoporous silica framework with hierarchical structure for hydrogenation of naphthalene

Pang

Chen

et al. 2015

Applied Catalysis A: General

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Single-step pyrolytic preparation of Mo2C/graphitic carbon nanocomposite as catalyst carrier for the direct liquid-feed fuel cells

Cited by 29 publications

References 43 publications

Effect of acid functionalised carbon supports for Pd–Ni–Sn catalyst on ethanol oxidation reaction

Effect of acid functionalised carbon supports for Pd–Ni–Sn catalyst on ethanol oxidation reaction

Selective Hydrogenation of Cinnamaldehyde to Cinnamal Alcohol over Platinum/Graphene Catalysts

MoC x species embedded in ordered mesoporous silica framework with hierarchical structure for hydrogenation of naphthalene

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