A facile hydrazine hydrate reduction of graphene oxide (GO) with surface-passivated by a polyethylene glycol (PEG) method for the fabrication quantum dots (GQDs) frequency upconverted emission is presented. And we speculate on upconversion luminescence due to anti-Stokes photoluminescence (ASPL), where δE between π and σ orbitals near 1.1 eV.

The photocatalytic activity of TiO2 is limited by the aggregation nanoparticles and fast electron–hole pair recombination. Graphene sheets, with high specific surface area unique electronic properties, can be used as a good support for to enhance activity. Herein, we prepared graphene–TiO2 (G–TiO2) composites through one-pot solvothermal reaction using graphite oxide (GO) tetrabutyl titanate starting materials. particles anatase phase narrow size distribution were dispersed on graphene...

A hybrid composite of Co NPs embedded in N-doped carbon was prepared. With the synergistic interactions, catalyst exhibits efficient bifunctional catalytic activity and stability toward both ORR OER.

A novel and simple approach for preparing graphene quantum dots surface-passivated by polyethylene glycol (GQDs-PEG) has been developed a one-pot hydrothermal reaction, using small oxide (GO) sheets (PEG) as starting materials. The prepared GQDs-PEG show excellent luminescence properties, the PL yield of with 360 nm emission was about 28.0%, which two times higher than pure GQDs. Interestingly, possess upconversion photoluminescence (UCPL) properties. Blue clearly shown both under...

Transition metal nanoparticles (Fe, Co, and Ni) encapsulated in N-doped carbon nanotube hybrids were prepared, the catalytic activities of three catalysts are compared discussed. The optimized Co/N-CNT catalyst exhibits superb bifunctional activity with a Δ<italic>E</italic>value 0.78 V.

A novel and facile approach for preparing hydrophilic carbogenic dots (CDs) has been developed with mesoporous silica spheres as nanoreactors by using an impregnation method. The resulting highly efficient photoluminescent CDs without any further treatment are monodisperse, photostable of low toxicity, show excellent luminescence properties.

It is highly crucial and challenging to develop bifunctional oxygen electrocatalysts for reduction reactions (ORRs) evolution (OERs) in rechargeable metal-air batteries unitized regenerative fuel cells (URFCs). Herein, a facile cost-effective strategy developed prepare mesoporous Fe-N-doped graphene-like carbon architectures with uniform Fe3C nanoparticles encapsulated graphitic layers (Fe3C@NG) via one-step solid-state thermal reaction. The optimized Fe3C@NG800-0.2 catalyst shows comparable...

Abstract Herein, a ternary nanocomposite with TiO 2 nanoparticles anchored on reduced graphene oxide (rGO)-encapsulated Fe 3 O 4 spheres (Fe @rGO@TiO ) is presented as high efficient heterogeneous catalyst for photo-Fenton degradation of recalcitrant pollutants under neutral pH. was synthesized by depositing the surface wrapped (GO) which obtained an electrostatic layer-by-layer method. This as-prepared reflected good ferromagnetism and superior stability makes it convenient to be separated...

Abstract Designing efficient catalysts and understanding the underlying mechanisms for anodic nucleophile electrooxidation are central to advancement of electrochemically-driven technologies. Here, a heterostructure nickel boride/nickel catalyst is developed enable methanol into formate with Faradaic efficiency nearly 100%. Operando electrochemical impedance spectroscopy in situ Raman applied understand influence concentration oxidation reaction. High concentrations inhibit phase transition...

<italic>Via</italic> a solvothermal carbonization process, an enriched graphitic N-doped carbon-supported Fe₃O₄ nanoparticles composite was prepared which exhibits similar high catalytic activity but superior stability to Pt/C for the oxygen reduction reaction.

Electrocatalytic reactions occur in the nanoscale space at electrified electrode-electrolyte interface. It is well known that interface, also called as interfacial microenvironment, difficult to investigate due interference of bulk electrolytes and its dynamic evolution response applied bias potential. Here, we employ electrochemical co-reduction CO2 H2O on commercial Ag electrodes a model system, conjunction with quaternary ammonium cationic surfactants electrolyte additives. We probe...

Due to their high specific surface area and good electric conductivity, nitrogen-doped porous carbons (NPCs) carbon nanotubes (CNTs) have attracted much attention for electrochemical energy storage applications. In the present work, we firstly prepared MWCNT/ZIF-8 composites by decoration of zeolitic imidazolate frameworks (ZIF-8) onto multi-walled CNTs (MWCNTs), then obtained MWCNT/NPCs direct carbonization MWCNT/ZIF-8. By controlling reaction conditions, with three different particle sizes...

Electrochemical nitrate reduction reaction (NO3RR) offers a new pathway for low-temperature green ammonia synthesis. It is widely known that copper and its oxide catalysts are selective NO3RRs, although the role played by their oxidation state in catalysis not fully understood. Here, we found situ electrochemical modulates of facilitating loading Cu2O active sites on island-like copper, investigated effect cuprous reduction. We improvement yield (Faraday efficiency: 98.28%, selectivity:...

Electrochemical production of hydrogen peroxide (H2 O2 ) from on single-atom catalysts has attracted great attention, yet the quest for robust is driven by achieving >90 % Faradaic efficiency (FE) under industrial-relevant current densities (>100 mA cm-2 ). Herein we synthesize a catalyst that contains single nickel site coordinated four nitrogen and two oxygen atoms (i.e., N4 Ni1 via involving carboxyl functionalized multiwall carbon nanotubes as substrate to provide extra O coordination...

Abstract Designing highly efficient and stable electrode‐electrolyte interface for hydrogen peroxide (H 2 O ) electrosynthesis remains challenging. Inhibiting the competitive side reaction, 4 e − oxygen reduction to H O, is essential selective electrosynthesis. Instead of hindering excessive hydrogenation via catalyst modification, we discover that adding a hydrogen‐bond acceptor, dimethyl sulfoxide (DMSO), KOH electrolyte enables simultaneous improvement selectivity activity Spectral...

Abstract The electrochemical reduction of nitrates (NO 3 RR) for ammonia synthesis at room temperature holds immense potential. One key challenge is the adsorption and activation NO − , along with provision sufficient active hydrogen to accelerate hydrogenation process. Here, study prepares N‐doped TiO 2‐x supported by Zr single atoms (Zr‐TiON) rich oxygen vacancies (O v ), in which unsaturated (Lewis acidic, LA) sites together around O base, LB) form frustrated Lewis acid‐base pairs (FLPs)....

Despite tremendous progress in developing doped carbocatalysts for the oxygen reduction reaction (ORR), ORR activity of current metal-free is still inferior to that conventional Pt/C catalysts, especially acidic media and neutral solution. Moreover, it also remains a challenge develop an effective scalable method synthesis carbocatalysts. Herein, we have developed nitrogen phosphorus dual-doped hierarchical porous carbon foams (HP-NPCs) as efficient electrocatalysts ORR. The HP-NPCs were...

Non-noble metal copper (Cu) nanoparticles (NPs) with controlled size and surface coverage are decorated on silicon nanowire arrays (SiNWAs) by a simple galvanic displacement reaction. Using the combined efforts of all these approaches, SiNWAs-supported Cu NPs (SiNWAs–Cu) exhibit excellent stable activity for catalytic reduction 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) sodium borohydride (NaBH4) in an aqueous solution, which can be recycled five successive cycles reaction conversion...

The NiCo₂O₄ nanocage with a hollow cavity, large roughness and high porosity exhibits an excellent stable activity for the oxygen evolution reaction (OER) catalysis.

A one-pot solvothermal reaction was used to prepare graphene/Fe3O4 composites using graphite oxide and FeCl3·6H2O as starting materials. Graphene reduced graphene the Fe3O4 microspheres were simultaneously grown on carbon basal planes under conditions generated in system. The product showed a high crystallinity of magnetite considerable saturation magnetization. size density distributed can be easily controlled by altering Fe3+ concentration. Doxorubicin hydrochloride loaded simple mixing,...

Here we report the room-temperature, atmospheric synthesis of Mn-doped cesium lead halide (CsPbX3) perovskite quantum dots (QDs). The is performed without any sort protection, and dual-color emission mechanism revealed by density functional theory. Mn concentration reaches a maximum atomic percentage 37.73 at%, which significantly higher in comparison to those achieved earlier reports via high temperature hot injection method. optical properties as-prepared nanocrystals (NCs) remain...