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A low-cost and binder-free cobalt electrode is prepared by the electrodeposition of Co nanoplates onto a flexible conductive substrate, which is prepared simply by scratching a piece of A4 paper with a common 8B pencil. The morphology and phase structure of the cobalt–graphite–paper (CGP) electrode are characterized by scanning electron microscopy, transmission electron microscopy and an X-ray diffractometer. The catalytic activity of the CGP electrode for NaBH4 electro-oxidation is investigated by cyclic voltammetry and chronoamperometry. The catalyst combines tightly with the paper and exhibits a good stability. The oxidation current density reaches up to 180 mA cm−2 in 1 mol dm−3 NaOH and 0.10 mol dm−3 NaBH4 at −0.4 V. [ABSTRACT FROM AUTHOR]

In this report, graphene nanosheets (GNS)/nickel sulfide (NiS) based material for high-performance supercapacitor is prepared by “dip and dry” and electrodeposition methods. Commercial flexible make-up cottons (MCs) are chose as skeletons to construct homogeneous three-dimensional (3D) interconnected graphene-wrapped macro-networks, which can support structures for high loading of active electrode materials and facilitate the access of electrolytes to active electrode materials. The hybrid GNS/NiS based MCs (denoted as MCs@GNS@NiS) electrode yields relatively high specific capacitance of 775 F g −1 at a charge/discharge specific current of 0.5 A g −1 and good capacitance retention of 88.1% after 1000 cycles at 2 A g −1 . Furthermore, the MCs@GNS@NiS electrode delivers a high energy density of 11.2 Wh kg −1 at even a high power density of 1008 W kg −1 . Therefore, such low-cost and high-performance energy MCs based on GNS/NiS hierarchical nanostructures offer great promise in large-scale energy storage device applications. [ABSTRACT FROM AUTHOR]

A novel and binder free Co@graphite/paper electrode is prepared by electrodeposition Co nano-sheet on the surface of a graphite layer modified paper substrate. The morphology and phase structure of the Co@graphite/paper electrode are characterized by scanning electron microscopy equipped with energy dispersive X-ray spectrometer, transmission electron microscope and X-ray diffractometer. The catalytic activity of the Co@graphite/paper electrode for H 2 O 2 electrooxidation is investigated by means of cyclic voltammetry and chronoamperometry. The catalyst combines tightly with the paper and exhibits a good stability. The oxidation current density reaches to 580 mA cm −2 in 2 mol dm −3 NaOH and 0.5 mol dm −3 H 2 O 2 at 0.5 V. Besides, we illustrate the reaction mechanization of the H 2 O 2 electrooxidation on the Co film. [ABSTRACT FROM AUTHOR]

Abstract: Flexible and wearable cobalt electrode with a unique three-dimensional hierarchical-network structure is prepared by electrodeposition of spherical Co particles onto multiwalled carbon nanotubes (MWNTs) which are assembled on the skeleton of cosmetic cotton (CC). The morphology and phase structure of the cobalt–multiwalled carbon nanotubes–cosmetic cotton (Co–MWNTs–CC) electrode are characterized by scanning electron microscope, transmission electron microscope and X-ray diffraction spectrometer. The NaBH4 electrooxidation performance on the Co–MWNTs–CC electrode is investigated by means of cyclic voltammetry and chronoamperometry. Results show that the Co–MWNTs–CC electrode exhibits remarkably high catalytic activity and good stability for NaBH4 electrooxidation. The oxidation current density reaches as high as 170 mA cm−2 at −0.7 V in 1.0 mol dm−3 NaOH and 0.1 mol dm−3 NaBH4, which is higher than the most-related previous results. [Copyright &y& Elsevier]

Highlights: [•] A 3D porous Ni film is electrodeposited on Ni foam via electrodeposition. [•] Ni/Ni-foam electrode shows high catalytic activity for H2O2 electrooxidation. [•] DPPFC with Ni/Ni foam anode and Pd/CFC cathode has been demonstrated. [ABSTRACT FROM AUTHOR]

Highlights: [•] Dendritic Pd supported on CFC is decorated with Au via potential pulse technique. [•] Au@Pd/CFC electrode shows high catalytic activity for H2O2 reduction and oxidation. [•] DPPFC obtains a much higher performance based on the Au@Pd/CFC electrodes. [ABSTRACT FROM AUTHOR]

Abstract: Carbon fiber cloth supported micro- and nano-structured Co electrode is prepared by a facile and fast square-wave electrodeposition method. The electrode is characterized by scanning electron microscope and X-ray diffractometer. Its electrocatalytic performance for hydrazine oxidation in alkaline media is investigated by means of cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy. Co is uniformly deposited on the carbon fiber surface and presents as nano-sheets and micro-particles intersected mutually. The nano-sheets have a thickness of around 250nm and the size of the micro-particles is up to around 10μm. Hydrazine electrooxidation on the electrode occurs via both direct and indirect pathways. The activation energy of the direct electrooxidation of hydrazine is 16.6kJmol−1 which is higher than that of the electrooxidation of hydrogen in the indirect pathway (9.9kJmol−1). [Copyright &y& Elsevier]