Molecular and heterogeneous water oxidation catalysts improve the performance of hematite as a photoanode <italic>via</italic> fundamentally different mechanisms.

Solar water splitting in acidic solutions has important technological implications, but not been demonstrated to date a dual absorber photoelectrochemical cell. The lack of functionally stable water-oxidation catalysts (WOCs) acids is key reason for this slow development. only WOCs that are at low pH Ir-based systems, which typically too expensive be implemented broadly. It now shown deficiency may corrected by applying an ultra-thin monolayer molecular Ir WOC hematite solar solutions....

The inertness of the C-H bond in CH4 poses significant challenges to selective oxidation, which often proceeds all way CO2 once activated. Selective oxidation high-value industrial chemicals such as CO or CH3OH remains a challenge. Presently, main methods activate include thermochemical, electrochemical, and photocatalytic reactions. Of them, reactions hold great promise for practical applications but have been poorly studied. Existing demonstrations exhibit limited control over product...

CO2 electrochemical reduction is of great interest not only for its technological implications but also the scientific challenges it represents. How to suppress kinetically favored hydrogen evolution in presence H2O, instance, has attracted significant attention. Here we report a new way achieving such goal. Our strategy involves unique water-in-salt electrolyte system, where H2O concentration can be greatly suppressed due strong solvation high-concentration salt. More importantly, offers an...

Producing syngas from electrochemical reduction of CO2 by renewable energy offers an opportunity to reduce emissions and provide chemicals fuels. Herein, we report the careful manipulation treatment synthesize copper nanowire arrays (Cu NAs). By thermal oxidation, oxide nanowires were grown on a Cu mesh. Then, used with morphologic features largely preserved. The derived NAs are cost-effective electrocatalysts capable reducing H2O for tunable production. It is demonstrated that syngas,...

IMPS shows that reducing recombination at low applied potentials is crucial in maximizing the onset potential for HER.

The CO2-reduction activity of two Re(i)-NHC complexes is investigated employing a silicon nanowire photoelectrode to drive catalysis. Photovoltages greater than 440 mV are observed along with excellent selectivity towards CO over H2 formation. production correlates strong adsorption the catalysts on surface.

In the presence of a molecular Co(II) catalyst, CO2 reduction occurred at much less negative potentials on Si photoelectrodes than an Au electrode. The addition 1 % H2 O significantly improved performance catalyst. Photovoltages 580 and 320 mV were obtained nanowires planar photoelectrode, respectively. This difference likely originated from fact that multifaceted are better in light harvesting charge transfer surface.

One-step synthesis of β-carboxyl ketones from α,β-unsaturated using CO2 as a feedstock by photoelectro-synergetic catalysis is reported herein. In this ambient system, silica nanowires (SiNWs) electrode not only acts the working but also harvests extra light energy to promote reaction. Following possible two-step single-electron-transfer process, various substrates exhibit good efficiency with up 98% product yield, and method shows wide functional group tolerance.

Abstract Solar water splitting in acidic solutions has important technological implications, but not been demonstrated to date a dual absorber photoelectrochemical cell. The lack of functionally stable water‐oxidation catalysts (WOCs) acids is key reason for this slow development. only WOCs that are at low pH Ir‐based systems, which typically too expensive be implemented broadly. It now shown deficiency may corrected by applying an ultra‐thin monolayer molecular Ir WOC hematite solar...

(Photo)electrochemistry enables the synthesis of high-value fine chemicals and highly selective activation molecules that are difficult to prepare using conventional chemical methods. In this work, light-driven NADH (reduced nicotinamide adenine dinucleotide) regeneration is achieved a molecular Rh(III) mediator on Si photoelectrodes. This process observed be sensitive surface nature photoelectrodes, exhibiting an overpotential reduction up 600 mV nanowires (SiNWs) as compared planar Si. The...

We report an electrochemical method for coupling biomass-derived C5/C6 compounds to value-added fuel precursors. Using only 2 % of equivalent charges, 2-methylfuran (2-MF) was oxidized yield a cation radical, which readily reacted with 3-hexene-2,5-dione, derivate 2,5-dimethylfuran, produce 3-(5-methylfuran-2-yl)hexane-2,5-dione. The product converted 4-ethylnonane (a component biodiesel/jet fuel) in single step excellent yield. Importantly, the reaction not sensitive oxygen, and trace...

To develop novel microwave absorbing materials, polyaniline (PANI) composites filled with graphene was prepared, and the morphology, crystallographic structures parameters of were investigated by SEM, XRD, FTIR HP8722ES network analyzer. The uniform dispersion significantly enhanced formation conductive pathways in PANI arrays interfacial affinity between increases number electron transfer. show great properties −17dB. This study reveals that PANI-Graphene composite is promising for...

Kinetic studies of photo- and photoelectro-catalysis fixation CO2 are rare. Herein, a typical reduction addition to trans-stilbene is studied. Through Tafel analyses, the reaction rate-determining step (RDS) identified as first an anion free radical generation from substrate, order 0.5.

We report the fabrication of a tin nanoparticles coated anode in graphene (SnO2 /graphene) for lithium-ion batteries. As an material Li ion batteries, it has 806mAhg-1 and 683mAhg-1 capacities first discharge charge, respectively, which is more than theoretical capacity oxide, good retention with 606mAhg-1 after 30 cycles.

A facile synthesis method of three dimensional reduced graphene oxide (RGO)/multiwalled carbon nanotubes (MWCNTs) hydrogel was introduced. Hydrogel samples which were characterized by scanning electron microscope (SEM), transmission microscopy (TEM) and examined X-ray diffraction (XRD) have been used as the electrode supercapacitor. Cyclic voltammetry (CV) galvanostatic charge-discharge (GCD) to investigate Supercapacitors we fabricated. Because MWCNTs inserting into layers RGO homogeneously...

Abstract We report an electrochemical method for coupling biomass‐derived C5/C6 compounds to value‐added fuel precursors. Using only 2 % of equivalent charges, 2‐methylfuran (2‐MF) was oxidized yield a cation radical, which readily reacted with 3‐hexene‐2,5‐dione, derivate 2,5‐dimethylfuran, produce 3‐(5‐methylfuran‐2‐yl)hexane‐2,5‐dione. The product converted 4‐ethylnonane (a component biodiesel/jet fuel) in single step excellent yield. Importantly, the reaction not sensitive oxygen, and...

Graphene as high capacity anode materials for rechargeable lithium ion batteries (LIBs) have been studied extensively with the aim of enhancing and electron transport, lowering stress caused by their volume changes during charge/discharge processes electrodes in LIBs. As we know, graphite is a practical material used LIBs, because its capability reversible intercalation layered crystals, structural similarities graphene to may provide another type compound. In this work, LIBs include...

The phosphors of MO-Re2O3-B2O3:Eu3+ (M = Mg, Sr; Re Y, Gd) were prepared by conventional solid-state reaction. Red-emitting (M=Mg, Re=Y, had the highest luminescence intensity under vacuum ultraviolet (VUV) excitation. They sharp emission peak lines at 591 and 613nm, which assigned to transitions 5D0→7F1 5D0→7F2. By introduction Sr into MgO-Re2O3-B2O3:Eu3+ Gd), absorption peaked 172nm enhanced.

Preparing nanoscale patterns with bright and high resolution structural colors for object decoration remains a challenge. Herein, the authors propose strategy fabricating surface‐universal large‐area photonic crystal monolayer membrane stable plasmonic coloration based on polydopamine (PDA) modification, self‐assembly, transfer printing, e‐beam evaporation. In practice, is achieved different diameters of silica polystyrene (PS) colloidal nanoparticles through layer‐by‐layer (LBL)...

The patterned ZnO rods were fabricated by the photoresist pattern covered sputtered film assisted hydrothermal deposition.The ordered nanorods prepared reaction in sodium citrate and Zinc nitrate solution. hole works together for crystallization vertically to c axis of ZnO. A UV emission at 395nm an intense green-blue peak 580nm observed from which reflect rods. influence different growth times micro-sized holes on photoluminescence property crystal quality nanowires arrays investigated.

A series of phosphor MBPO7:Tm3+, and Gd3+ (M= Mg, Sr, Ca) were prepared studied. The XRD data showed Tm3+, didn’t affects the lattice parameters. Excitation spectra exhibited high absorption in vacuum ultraviolet (VUV) region. There existed strong emission peaking at 453nm 363nm correspond to 1D2 →3HJ (J=4, 6) transition Tm 3+ when excited under VUV. With changes cation samples, excitation changed greatly, lead a great change its spectra. crystal parameters affect ratio intensity peak 454nm 312nm.