Synthesis of copper nanowire decorated reduced graphene oxide for electro-oxidation of methanol

Periasamy, Arun Prakash; Liu, Jifeng; Lin, Hsiu‐Mei

doi:10.1039/c3ta10745k

Cited by 69 publications

(42 citation statements)

References 58 publications

(85 reference statements)

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“…12 After the reduction process, the f-FWNT/rGO electrode showed indistinct redox feature in the broad voltage range of 2.5 ~ 4 V vs. Li/Li + . 60 The values of R ct for the f-FWNT/r-CGO and f-FWNT/rGO are ~1000 and ~2350 Ω cm 2 , respectively, indicating much faster redox reactions of the f-FWNT/r-CGO than f-FWNT/rGO. 36,41,44,47,59 The difference of the gravimetric current density between f-FWNT/r-CGO and other electrodes became prominent at a high scan rate of 5 mV/s (Fig.…”

Section: Resultsmentioning

confidence: 96%

Hierarchical networks of redox-active reduced crumpled graphene oxide and functionalized few-walled carbon nanotubes for rapid electrochemical energy storage

Lee

Liu

et al. 2016

Nanoscale

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Crumpled graphene is known to have a strong aggregation-resistive property due to its unique 3D morphology, providing a promising solution to prevent the restacking issue of graphene based electrode materials. Here, we demonstrate the utilization of redox-active oxygen functional groups on the partially reduced crumpled graphene oxide (r-CGO) for electrochemical energy storage applications. To effectively utilize the surface redox reactions of the functional groups, hierarchical networks of electrodes including r-CGO and functionalized few-walled carbon nanotubes (f-FWNTs) are assembled via a vacuum-filtration process, resulting in a 3D porous structure. These composite electrodes are employed as positive electrodes in Li-cells, delivering high gravimetric capacities of up to ∼170 mA h g(-1) with significantly enhanced rate-capability compared to the electrodes consisting of conventional 2D reduced graphene oxide and f-FWNTs. These results highlight the importance of microstructure design coupled with oxygen chemistry control, to maximize the surface redox reactions on functionalized graphene based electrodes.

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Section: Resultsmentioning

confidence: 96%

Hierarchical networks of redox-active reduced crumpled graphene oxide and functionalized few-walled carbon nanotubes for rapid electrochemical energy storage

Lee

Liu

et al. 2016

Nanoscale

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“…S7 † displays the Raman spectra of GO, CG, and ACG; revealing two distinct peaks, corresponding to the D-band (due to the doubly degenerate E 2g mode at the Brillouin zone center) and the G-band (arising from the defect-mediated zone-edge phonons). 39,[57][58][59] The D-and G-bands are at 1347 cm −1 and 1599 cm −1 , respectively, for the samples. The D-band and G-band intensity ratio (I D /I G ) at 0.91 corresponds to GO, whereas after GO reduction (i.e., RGO) the ratio increases to 1.06.…”

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confidence: 99%

“…[37][38][39][40] The sheet resistance of the GR network is reduced by opening up new conduction channels by bridging the high resistance grain-boundaries † Electronic supplementary information (ESI) available: Experimental details, photographs of the experimental setups for photocatalytic activity testing, SEM images of Ag NWs and CdS NWs, Zeta potential, Raman spectra, DRS spectra, PL spectra and PL decay time evolution, and photocatalytic performances of samples for reduction of 4-NA and recycling test. See…”

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confidence: 99%

Constructing one-dimensional silver nanowire-doped reduced graphene oxide integrated with CdS nanowire network hybrid structures toward artificial photosynthesis

et al. 2015

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A ternary hybrid structure of one-dimensional (1D) silver nanowire-doped reduced graphene oxide (RGO) integrated with a CdS nanowire (NW) network has been fabricated via a simple electrostatic self-assembly method followed by a hydrothermal reduction process. The electrical conductivity of RGO can be significantly enhanced by opening up new conduction channels by bridging the high resistance grain-boundaries (HGBs) with 1D Ag nanowires, which results in a prolonged lifetime of photo-generated charge carriers excited from the CdS NW network, thus making Ag NW-RGO an efficient co-catalyst with the CdS NW network toward artificial photosynthesis.

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“…Both samples exhibit similar CV curves in the NaOH solution without and with methanol. Meanwhile, the anodic peaks at 0.82 V are observed after the methanol was added, as shown in Figure b, indicating a typical methanol electrocatalytic oxidation process associated with the formation of Cu(III) species, which has been generally reported to be a redox mediator for the oxidation of methanol on Cu‐loaded electrodes . It is noted that the oxidation current density of the 3Dp‐hnp‐Cu electrode toward the oxidation of methanol is larger than that of np‐Cu and the onset oxidation potential of the 3Dp‐hnp‐Cu electrode has a negative shift compared to that of the np‐Cu electrode, suggesting that the 3Dp‐hnp‐Cu electrode possesses better electrocatalytic activity in methanol oxidation than the np‐Cu electrode.…”

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confidence: 85%

Hierarchical Nanoporous Copper Architectures via 3D Printing Technique for Highly Efficient Catalysts

Zhang

Sun

Nomura

et al. 2019

Small

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Nanoporous metals represent a class of functional materials with unique bicontinuous open porous structural properties, making them ideal candidates for various catalyst applications. However, the pursuit of nanoporous properties, extremely small pores, and high surface area, results in the restriction of mass transport. Herein, a free‐standing hierarchical nanoporous Cu material, prepared by a selective laser melting 3D printing technique and a one‐step dealloying process, is presented as a highly efficient electrocatalyst for methanol oxidation. It is demonstrated that the digitally controlled hierarchical structure with macro‐ and nano‐scaled pores can be utilized for promoting and directing mass transport as well as for the enhancement of catalytic properties. This work highlights a facile, low‐cost, and alternative strategy for hierarchical nanoporous structure design that can be applied to binary, ternary, and quaternary metal alloys for various functional applications.

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Synthesis of copper nanowire decorated reduced graphene oxide for electro-oxidation of methanol

Cited by 69 publications

References 58 publications

Hierarchical networks of redox-active reduced crumpled graphene oxide and functionalized few-walled carbon nanotubes for rapid electrochemical energy storage

Hierarchical networks of redox-active reduced crumpled graphene oxide and functionalized few-walled carbon nanotubes for rapid electrochemical energy storage

Constructing one-dimensional silver nanowire-doped reduced graphene oxide integrated with CdS nanowire network hybrid structures toward artificial photosynthesis

Hierarchical Nanoporous Copper Architectures via 3D Printing Technique for Highly Efficient Catalysts

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