Highly dispersed nanocrystallines WC supported on microwave exfoliated RGO by ionic liquid and its catalytic performance in electroreduction of nitrobenzene

Liu, Weiming; Shi, Meiqin; Lang, Xiaoling; Zhao, Di; Chu, Youqun; Ma, Chao

doi:10.1016/j.cattod.2012.08.017

Cited by 13 publications

(7 citation statements)

References 34 publications

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“…2.1. Preparation of the PtRu/RGO: First, GO was derived from graphite powders (SP, from Sinopharm Chemical Reagent Co. Ltd) with a modified Hummers method according to our previous paper [33]. The obtained GO powders were dispersed in 20 ml of EG and sonicated for 1 h to form a homogeneous GO suspension.…”

Section: Methodsmentioning

confidence: 99%

Special microwave‐assisted one‐pot synthesis of low loading Pt–Ru alloy nanoparticles on reduced graphene oxide for methanol oxidation

Zhao

Shi

Liu

et al. 2014

Micro & Nano Letters

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In this reported work, low loading Pt-Ru alloy nanoparticles (PtRu NPs) have been highly dispersed on reduced graphene oxide (PtRu/RGO) via an auto-power adjusting microwave-assisted one-pot reaction process. The transmission electron microscopy result shows that PtRu NPs with a mean size of ∼ 2.99 nm decorated uniformly on RGO. The prepared PtRu/RGO is used as an electrocatalyst for the methanol oxidation reaction (MOR). Compared with the commercial carbon-supported Pt-Ru alloy electrocatalyst, the PtRu/RGO composites demonstrate higher electrochemical active surface area and excellent electrocatalytic activity towards the MOR, such as higher peak current density, lower onset potential and long-term stability. It is deduced that the good performance of the PtRu/RGO towards methanol oxidation could be attributed to the characterised RGO support which provides more effective support and enhances the utilisation of the PtRu clusters, and to the highly dispersed small Pt-Ru alloy NPs resulting from the special microwave heating mode and lower synthesis temperature, which subsequently leads to a valid bifunctional mechanism between Pt and Ru. The present study proves that the PtRu/RGO composites could be a promising alternative catalyst for direct methanol fuel cells and this effective preparation method can be widely applied to other metal/ bimetal NPs.

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Section: Methodsmentioning

confidence: 99%

Special microwave‐assisted one‐pot synthesis of low loading Pt–Ru alloy nanoparticles on reduced graphene oxide for methanol oxidation

Zhao

Shi

Liu

et al. 2014

Micro & Nano Letters

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“…Graphite oxide (GO) was synthesized from natural graphite powder (SP, from Sinopharm Chemical Reagent Co., Ltd.) by a modified Hummers method, [16] which is originally presented by Kovtyukhova et al [17,18] First, 2 g graphite powder was added to 46 mL concentrated H 2 SO 4 , and then 6 g KMnO 4 was added gradually under stirring at 0 ℃. After stirring at 0 ℃ for 2 h, the mixture was then ultrasonically dispersed at 40 ℃ for 40 min.…”

Section: Preparation Of Wc/rgomentioning

confidence: 99%

Investigation of Platinum Dispersed on Reduced Graphene Oxide‐supported Tungsten Carbide via Sacrificial Cu Adlayers for Methanol Oxidation

et al. 2014

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Reduced graphene oxide-supported tungsten carbide composite (WC/RGO) was prepared by program-controlled reduction-carburization technique. Scanning electron microscope (SEM) and transmission electron microscope (TEM) show that WC nanoparticles with a narrow distribution (10-20 nm) are highly dispersed both on the edge and between the layers of RGO. And then it was used as a support to load different low contents (no more than 0.4 wt%) of Pt via sacrificial Cu adlayers. The morphology and the electrocatalytic activity of the prepared catalysts were characterized by TEM and cyclic voltammograms (CV), respectively. The results indicate that a small amount of isolated Pt atoms show low or even no activity for methanol oxidation. With the increasing deposition cycles, the content of Pt and the ensembles of neighboring Pt atoms are increased, which makes the onset potential shift negatively and mass current density increase. The results demonstrate that controllable amount of Pt can be deposited on WC/RGO by galvanic displacement with Cu, and the extent and domain of Pt loading affect the electrochemical performance. Meanwhile, this research also provides another route to prepare a catalyst with ultra low noble metal on WC/RGO for solving the problem of high cost of the catalyst.

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“…The synthesis method has several advantages: (i) GO was firstly pretreated by muffle furnace within 3 min to remove most of the oxygen‐containing groups, which could immensely increase its specific surface area and electrical conductivity [9, 10]; (ii) hydrogen atmosphere could remove the stubborn residues of oxygen‐containing groups in (i) for final formation of RGO; and (iii) RGO can be produced in large scale in short time without any solvent. According to the report and our previous research [11, 12], RGO can be used as an efficient and effective catalyst for hydrogenation of nitrobenzene (NB). Therefore, our RGO was used to evaluate the catalytic activity for the electroreduction of NB to P‐aminophenol (PAP).…”

Section: Introductionmentioning

confidence: 99%

“…However, in addition to the complex electrode preparation process, the potential of NB reduction is often negative than that of molecular hydrogen evolving at most electrodes, and thus electrolysis at the potential of NB reduction often caused parallel electrolysis of water, resulting in lowering current efﬁciency as well [14]. Fortunately, compared with other common electrodes, such as copper [13], nickel [15], copper alloy [16], titanium [17] or platinum‐based composite electrode [18], even our reported WC/RGO electrode [12], the RGO electrode exhibits more positive reductive peak potential and higher cathodic peak current through the electrochemical experiments, suggesting its better electrocatalytic ability toward the reduction of NB to PAP, which may result from the effective preparation process of RGO.…”

Section: Introductionmentioning

confidence: 99%

“…Experimental section 2.1. Synthesis of samples: First, graphite oxide (GO) was derived from graphite powders (SP, from Sinopharm Chemical Reagent Co., Ltd.) with a modified Hummers method according to our previous work [12], which was originally presented by Kovtyukhova et al [19] and Hummers and Offeman [20]. The typical preparation process was shown as follows.…”

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confidence: 99%

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Green and large‐scale preparation of reduced graphene oxide for electroreduction of nitrobenzene to p‐aminophenol

Liu

Wang

et al. 2016

Micro & Nano Letters

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A facile and green route to prepare reduced graphene oxide (RGO) is reported. The graphite oxide is firstly pretreated by detonating exfoliation in muffle furnace at low temperature and then is completely reduced to RGO in hydrogen atmosphere at high temperature, namely two-step method. Extensive characterisations show that the as-prepared RGO with high ratio of C/O and surface area consists of crumpled and few-layer thick graphitic sheets. The RGO is used to electrocatalyse nitrobenzene (NB) to P-aminophenol (PAP). High catalytic activity and stability obtained in the electrochemical measurement indicate that the RGO could be a promising alternative catalyst toward the electroreduction of NB to PAP.

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Highly dispersed nanocrystallines WC supported on microwave exfoliated RGO by ionic liquid and its catalytic performance in electroreduction of nitrobenzene

Cited by 13 publications

References 34 publications

Special microwave‐assisted one‐pot synthesis of low loading Pt–Ru alloy nanoparticles on reduced graphene oxide for methanol oxidation

Special microwave‐assisted one‐pot synthesis of low loading Pt–Ru alloy nanoparticles on reduced graphene oxide for methanol oxidation

Investigation of Platinum Dispersed on Reduced Graphene Oxide‐supported Tungsten Carbide via Sacrificial Cu Adlayers for Methanol Oxidation

Green and large‐scale preparation of reduced graphene oxide for electroreduction of nitrobenzene to p‐aminophenol

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