The visible-light photocatalytic performance of the heterostructured g-C3N4/Ag/TiO2 microspheres was investigated. As an electron-conduction bridge, Ag nanoparticles were photodeposited as interlayer between g-C3N4 and surface TiO2 to increase absorption via plasmon resonance. interface Ag/TiO2 facilitates direct migration photoinduced electrons from Ag/TiO2, which is conductive retarding recombination electron-holes. (4%)/Ag/TiO2 microsphere sample shows significant activity, higher than...

The ability to efficiently utilize solar thermal energy enable liquid-to-vapor phase transition has great technological implications for a wide variety of applications, such as water treatment and chemical fractionation. Here, we demonstrate that functionalizing graphene using hydrophilic groups can greatly enhance the steam generation efficiency. Our results show specially functionalized improve overall solar-to-vapor efficiency from 38% 48% at one sun conditions compared chemically reduced...

It is crucial to develop a catalyst made of earth-abundant elements highly active for complete oxidation methane at relatively low temperature. NiCo2O4 consisting which can completely oxidize in the temperature range 350–550 °C. Being cost-effective catalyst, exhibits activity higher than precious-metal-based catalysts. Here we report that catalytic results from integration nickel cations, cobalt cations and surface lattice oxygen atoms/oxygen vacancies atomic scale. In situ studies on...

A catalytic site typically consists of one or more atoms a catalyst surface that arrange into configuration offering specific electronic structure for adsorbing dissociating reactant molecules. The activity adjacent bimetallic sites metallic nanoparticles has been studied previously. An isolated supported on non-metallic could exhibit distinctly different performance owing to the cationic state singly dispersed and minimized choices binding configurations molecule compared with continuously...

Abstract Catalytic transformation of CH 4 under a mild condition is significant for efficient utilization shale gas the circumstance switching raw materials chemical industries to gas. Here, we report acetic acid and methanol through coupling , CO O 2 on single-site Rh 1 5 anchored in microporous aluminosilicates solution at ≤150 °C. The activity these singly dispersed precious metal sites production organic oxygenates can reach about 0.10 molecules site per second 150 °C with selectivity...

Abstract Direct conversion of methane to chemical feedstocks such as methanol under mild conditions is a challenging but ideal solution for utilization methane. Pd 1 O 4 single‐sites anchored on the internal surface micropores microporous silicate exhibit high selectivity and activity in transforming CH 3 OH at 50–95 °C aqueous phase through partial oxidation with H 2 . The production remains 86.4 %, while 95 about 2.78 molecules per site second when 2.0 wt % CuO used co‐catalyst @ZSM‐5....

The surface composition and morphology of CH3NH3PbI3 perovskite films stored for several days under ambient conditions were investigated by X-ray photoelectron spectroscopy, scanning electron microscopy, diffraction techniques. Chemical analysis revealed the loss CH3NH3+ I– species from its subsequent decomposition into lead carbonate, hydroxide, oxide. After long-term storage conditions, morphological transformation randomly distributed defects cracks, initially present in densely packed...

Going with the grain Changes in surface structure can make metal nanoparticles supported on oxides more active for certain catalytic reactions. Huang et al . show that steam pretreatment of palladium alumina led to a high density twin boundaries, unlike other oxidation and reduction pretreatments. The these stable boundaries at correlated higher methane rates lower temperatures initiation reaction. introduction additional defect sites through laser ablation created even catalysts. —PDS

Single atoms of platinum group metals on CeO2 represent a potential approach to lower precious metal requirements for automobile exhaust treatment catalysts. Here we show the dynamic evolution two types single-atom Pt (Pt1) CeO2, i.e., adsorbed Pt1 in Pt/CeO2 and square planar PtATCeO2, fabricated at 500 °C by atom-trapping method 800 °C, respectively. Adsorbed is mobile with situ formation few-atom clusters during CO oxidation, contributing high reactivity near-zero reaction order CO. In...

Stability and scalability are essential urgent requirements for the commercialization of perovskite solar cells (PSCs), which retarded by non-ideal interface leading to non-radiative recombination degradation. Extensive efforts devoted reducing defects at surface. However, effects buried on degradation need be further investigated. Herein, an omnibearing strategy modify top surfaces film reduce interfacial defects, incorporating aluminum oxide (Al2 O3 ) as a dielectric layer growth scaffolds...

Water-gas shift (WGS) reactions on Co3O4 nanorods and anchoring singly dispersed Pt atoms were explored through building correlation of catalytic performance to surface chemistry catalysts during catalysis using X-ray absorption spectroscopy, ambient pressure photoelectron spectroscopy (AP-XPS), environmental TEM. The active phase pure WGS is nonstoichiometric cobalt monoxide with about 20% oxygen vacancies, CoO0.80. apparent activation energy (Ea) in the temperature range 180-240 °C 91.0 ±...

Complete catalytic oxidation of methane in the presence steam at low temperatures (T < 400 °C) is a crucial reaction for emission control, yet it presents profound challenges. The activation strong C–H bond temperature difficult, and water present any realistic application poisons active surface promotes sintering Pd particles during reaction. Finding materials that can deliver high rates while being more resistant to imperative advancing several technological applications natural gas-based...

Developing syntheses of more sophisticated nanostructures comprising late transition metals broadens the tools to rationally design suitable heterogeneous catalysts for chemical transformations. Herein, we report a synthesis Pd-Rh nanoboxes by controlling migration in core-shell nanoparticle. The nanobox structure is grid-like arrangement two distinct metal phases, and surfaces these boxes are {100} dominant Pd Rh. catalytic behaviors particles were examined electrochemistry investigate...

Although palladium-based materials are efficient catalysts for methane combustion, H2O-poisoning remains a significant problem at low operating temperatures (<450 °C). It is research challenge to find that can withstand water while delivering rates comparable the dry PdO phase. Therefore, an in situ sorption strategy could be advantageous maintaining high reaction. Here, we investigate sorbents used remove produced by reaction, which significantly enhances activity of Pd/CeO2 catalyst...

The oxidation of methane to methanol is a pathway utilizing this relatively abundant, inexpensive energy resource. Here we report new catalyst, bent mono(μ-oxo)dinickel anchored on an internal surface micropores,which active for direct oxidation. It synthesized from the loading nickel precursor micropores ZSM5 following activation in O2. Ni 2p3/2 species formed exhibits unique photoemission feature, which distinguishes NiO nanoparticles. formation was confirmed with X-ray absorption...

Transition metal oxide is one of the main categories heterogeneous catalysts. They exhibit multiple phases and oxidation states. Typically, they are prepared and/or synthesized in solution or by vapor deposition. Here we report that a controlled reaction, gaseous environment, after synthesis can restructure as-synthesized transition nanorods into new catalytic phase. Co3O4 with preferentially exposed (110) surface be restructured nonstoichiometric CoO1-x nanorods. Structure chemistry during...

Despite its competitive photovoltaic efficiency, the structural transformations of prototypical hybrid perovskite, methylammonium lead iodide, are facilitated by interactions with polar molecules. Changes in optical and electronic properties upon exposure to ammonia potentially can enable use perovskites gas-sensing applications. We investigated effects on CH3NH3PbI3 exposing perovskite films a wide range vapor pressures. Spectroscopic analyses indicated that ammonium cations replaced...

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,...

Following the remarkable success of application CH3NH3PbI3 perovskites in photovoltaics, a great focus has been placed on their stability to improve optoelectronic properties and seek commercial production. To gain better understanding thermal stability, we investigated chemical, morphological, photovoltaic transformations under elevated temperatures various controlled atmospheric conditions (vacuum, 1 mbar O2, H2O). A temperature-dependent study showed that decomposed PbI2 with release...

Abstract Methylammonium lead iodide perovskite (MAPbI 3 ), a prototype material for potentially high‐efficient and low‐cost organic–inorganic hybrid solar cells, has been investigated intensively in recent years. A study of low‐energy electron‐induced transformations MAPbI is presented, performed by combining controlled electron‐impact irradiation with X‐ray photoelectron spectroscopy scanning electron microscopy. Changes were observed both the elemental composition morphology irradiated...

Abstract Direct conversion of methane to chemical feedstocks such as methanol under mild conditions is a challenging but ideal solution for utilization methane. Pd 1 O 4 single‐sites anchored on the internal surface micropores microporous silicate exhibit high selectivity and activity in transforming CH 3 OH at 50–95 °C aqueous phase through partial oxidation with H 2 . The production remains 86.4 %, while 95 about 2.78 molecules per site second when 2.0 wt % CuO used co‐catalyst @ZSM‐5....