The electrochemistry of horse heart cytochrome c was studied by cyclic voltammetry at a glassy carbon electrode modified with single-wall nanotubes (SWNTs). A pair well-defined redox waves obtained in aqueous solution an activated SWNT film-modified electrode. optimal conditions for activating the has been determined. reaction is diffusion-controlled process. peak current increases linearly concentration range from 3.0 × 10-5−7.0 10-4 M. detection limit 1.0 10-5 film characterized scanning...

Monodispersed surfactant-free MoS2 nanoparticles with sizes of less than 2 nm were prepared from bulk by simple ultrasonication and gradient centrifugation. The ultrasmall expose a large fraction edge sites, along their high surface area, which lead to attractive electrocatalytic activity for reduction H2O2. An extremely sensitive H2O2 biosensor based on real determination limit as low 2.5 nM wide linear range 5 orders magnitude was constructed. On the basis this biosensor, trace amount...

Reduced graphene oxide/platinum supported electrocatalysts (Pt/RGO) were synthesized by employing a fast and eco-friendly microwave-assisted polyol process, which facilitated the simultaneous reduction of oxide formation Pt nanocrystals. This system was tested for potential use as an anode material through electrooxidation methanol. Compared to commercial carbon-supported electrocatalysts, Pt/RGO showed unprecedented CO poisoning tolerance, high electrochemical active surface area, catalytic...

Ultrasmall molybdenum sulfide nanoparticles with diameters of 1.47 ± 0.16 nm were fabricated from bulk MoS2 by a combination ultrasonication and centrifugation. The then assembled on an Au surface to form film high electrocatalytic activity for hydrogen evolution reaction (HER). A Tafel slope 69 mV per decade was measured this the onset potential estimated be −0.09 V. small loading (1.03 μg cm−2) current density (0.92 mA cm−2 at η = 0.15 V) demonstrated extremely catalytic efficiency. X-ray...

The design and development of inexpensive highly efficient electrocatalysts for hydrogen production underpins several emerging clean-energy technologies. In this work, the first time, molybdenum disulfide (MoS2) nanodots have been synthesized by ionic liquid assisted grinding exfoliation bulk platelets isolated sequential centrifugation. a thickness up to 7 layers (∼4 nm) an average lateral size smaller than 20 nm. Detailed structural characterization established that retained crystalline...

The study of efficient, robust, and earth-abundant electrocatalysts for the hydrogen evolution reaction (HER) is essential hydrogen-based energy technologies. Previous works have demonstrated that pyrite-structure materials (e.g., CoS2, NiSe2) are efficient HER catalysts. Here, we first systematically investigate nanostructure synthesis a series pyrite-phase nickel phosphoselenide materials—NiP2, Se-doped NiP2 (NiP1.93Se0.07), P-doped NiSe2 (NiP0.09Se1.91), NiSe2—through facile thermal...

MoS2 particles with different size distributions were prepared by simple ultrasonication of bulk followed gradient centrifugation. Relative to the inert microscale MoS2, nanoscale showed significantly improved catalytic activity toward oxygen-reduction reaction (ORR) and hydrogen-evolution (HER). The decrease in particle was accompanied an increase activity. Particles a around 2 nm exhibited best dual ORR HER performance four-electron process onset potential -0.16 V versus standard hydrogen...

Copolymer hybrid films consisting of polypyrrole/MoSx (x ≈ 5) with significantly enhanced electrocatalytic activity for the hydrogen evolution reaction (HER) are fabricated by a one-step electrochemical copolymerization pyrrole and (NH4)2MoS4. The show Tafel slope 29 mV dec−1 an onset potential 0 V vs. RHE, which is comparable to those commercial Pt/C catalysts. As service our authors readers, this journal provides supporting information supplied authors. Such materials peer reviewed may be...

The voltammetric behavior of norepinephrine (NE) was studied at a glassy carbon (GC) electrode modified with single wall nanotubes (SWNTs). In pH 5.72 B-R buffer solution, the SWNT-modified shows high electrocatalytic activity toward NE oxidation. One well-defined reversible redox couple is obtained scan rates lower than 0.15 V s−1. peak current increases linearly concentration in range 1.0×10−5 - 1.1×10−3 mol dm−3. detection limit 6.0×10−6 dm−3 and diffusion coefficient (D) 8.53×10−6 cm2...

Abstract Hierarchical, two‐dimensional (2D), disc‐like networks consisting of crossed single‐crystalline Bi 2 S 3 nanorods have been synthesized via a novel 2D‐template‐engaged topotactic transformation process, which involves the formation intermediate BiOCl discs and their subsequent chemical into nanofabrics. The process from (001)‐oriented to nanorod has followed by using scanning electron microscopy (SEM), transmission (TEM), diffraction (ED) X‐ray (XRD), revealed that close matching...

Hierarchical, three-fold symmetrical, single-crystalline gold dendrites were synthesized by the reaction between a zinc plate and solution of HAuCl4 in ionic liquid [BMIM][PF6]. The unique dendritic nanostructures show three-order hierarchy (i.e., symmetrical <111>-oriented trunk, three groups trident-like branches grown on many nanorod leaves symmetrically), indicating an interesting fractal growth. According to investigation growth process dendrites, it was proposed that nuclei...

A layered MoS2–thionin composite was prepared by sonicating their mixture in an ionic liquid and gradient centrifugation. Because DNA is rarely present single-stranded form, either naturally or after PCR amplification, the used for fabrication of a double-stranded (dsDNA) electrochemical biosensor due to stable response, intercalation, electrostatic interaction thionin with DNA. The linear range over dsDNA concentration from 0.09 ng mL–1 1.9 obtained, moreover, it suitable detection (ssDNA)....

Well-defined gold nanobelts as well unique nanocombs made of were readily synthesized by the reduction HAuCl4 with ascorbic acid in aqueous mixed solutions cationic surfactant cetyltrimethylammonium bromide (CTAB) and anionic sodium dodecylsulfonate (SDSn). Single-crystalline grown along <110> <211> directions prepared CTAB-SDSn at 4 27 degrees C, respectively. Furthermore, single-crystalline consisting a <110>-oriented stem nanobelt numerous <211>-oriented perpendicularly on one side...

Bulk quantities of graphene nanosheets and nanodots have been selectively fabricated by mechanical grinding exfoliation natural graphite in a small quantity ionic liquids. The resulting sheets dots are solvent free with low levels naturally absorbed oxygen, inherited from the starting graphite. only two to five layers thick. diameters range 9–29 nm heights 1–16 nm, which can be controlled changing processing time.

Ionizing radiation (gamma and x-ray) is widely used in industry medicine, but it can also pose a significant hazardous effect on health induce cancer, physical deformity even death, due to DNA damages invasion of free radicals. There therefore an urgent unmet demand designing highly efficient radioprotectants with synergetic integration effective renal clearance low toxicity. In this study, we designed ultrasmall (sub-5 nm) catalytically active cysteine-protected MoS2 dots as investigated...

Full(erene) of surprises: The first isomerically pure multi-hydroxylated fullerene, C60(OH)8, shows a reduction peak and reoxidation in aqueous solution. With surprising catalytic performance the hydrogen evolution reaction (HER), when electrodeposited on glassy carbon electrode (GCE), salts C60(OH)8 may prove to be effective molecular catalysts for conducting HER without transition metals.

The electrocatalytic activity of commercial MoP microparticles for hydrogen evolution reaction was enhanced by grinding and potentiostaticly electrochemical activation.

A simple strategy for one-step fabrication of tris(bipyridine)ruthenium(II) (Ru(bpy)32+)-functionalized metal–organic framework (Ru-MOF) thin films using a self-assembly approach assisted by an electrochemical way was introduced. In this protocol, the electrochemically driven cooperative reaction Ru(bpy)32+ as electrochemiluminescent (ECL) probe and structure-directing agent, trimesic acid (H3btc) ligand, Zn(NO3)2 Zn2+ source leads to simultaneous synthesis deposition MOF onto electrode...

Molecular catalysis of water oxidation has been intensively investigated, but its mechanism is still not yet fully understood. This study aims at capturing and identifying key short-lived intermediates directly during the catalyzed by a cobalt-tetraamido macrocyclic ligand complex using newly developed an in situ electrochemical mass spectrometry (EC-MS) method. Two ligand-centered-oxidation intermediates, [(L2–)CoIIIOH] [(L2–)CoIIIOOH], were observed for first time, further confirmed...

ABSTRACT This study aimed to enhance the antibacterial and biocompatible properties of PLA nonwoven materials by plasma‐assisted surface decoration with selenium nanoparticles. were pretreated plasma modification technology for varying durations. Subsequently, Se nanoparticles obtained from redox reaction sodium selenite loaded onto surfaces through impregnation. SEM images demonstrated that pretreatment enhances uniformity as well contents materials. Based on EDS analysis, relative...