Chanez Maouche

University of Turku | UTU

N-doped graphene has attracted a considerable interest in the development of a new promising metal-free catalyst for oxygen reduction reaction (ORR) to replace platinum-based catalysts. Herein we reported a facile fabrication of three-dimensional N-doped graphene (GC) using graphitic carbon nitride (g-C3N4) and graphene oxide (GO) as raw materials....

Three-dimensional (3D) graphene-based aerogels have attracted wide interest as a promising photocatalyst for dye degradation and hydrogen production. Herein we have developed a 3D nitrogen-doped graphene aerogel (3DNG) from graphitic carbon nitride combined with graphene oxide (GO). The nitrogen dopant in 3D aerogel was achieved by using a thermal...

Iron-nitrogen-carbon (Fe-N-C) catalysts derived from zeolitic-imidazolate frameworks (ZIFs) are worldwide accepted to be the most promising candidate for the oxygen reduction reaction (ORR), but the insufficient stability, the low FeNx exposure and poor density restrict their ORR activity. Here, we demonstrate a strategy to synthesize FeNx sites em...

Iron-nitrogen-carbon graphitic (Fe-N-C), a noble metal-free catalyst, holds a lot of promise as a substitute for platinum (Pt) as an efficient catalyst in the oxygen reduction reaction (ORR). However, the synthesis process and the stabilization of single atoms that tend to aggregate, without jeopardizing the catalytic activity, remain challenging....

In this contribution, we describe the kinetics associated with the rac-Me 2 Si[2-Me-4-Ph-Ind] 2 ZrCl 2 (Cat-1)/borate/TIBA cata-lyzed copolymerization of E/dienes (isoprene (IP), butadiene (BD), 5-ethylidene-2-norbornene (ENB), 4-vinylcyclohexene (VCH) and vinyl norbornene (VNB)), and E/diene/1-hexene (1H) terpolymerization by using thiophenecarbon...

In this contribution, we describe the kinetics associated with the rac -Me 2 Si[2-Me-4-Ph-Ind] 2 ZrCl 2 (Cat-1 ) /borate/TIBA catalyzed copolymerization of E/dienes (isoprene (IP), butadiene (BD), 5-ethylidene-2-norbornene (ENB), 4-vinylcyclohexene (VCH) and vinyl norbornene (VNB)), and E/diene/1-hexene (1H) terpolymerization by using thiophenecarb...

Single and dual atom catalysts (SACs and DACs) with high catalytic activity have emerged as a new frontier in many sectors owing to their exceptional atom utilization efficiency, excellent selectivity, and long durability. In addition of the synergistic effects of two adjacent metals active sites for DACs, and the tailoring of different single-meta...

How to efficiently convert solar energy into storable chemical energy has always been an urgent problem in the field of semiconductor-based photocatalysis. Broaden the light-absorption range of photocatalysts is an important strategy to improve the efficiency of solar energy conversion. This paper focused on the recent reported photocatalytic syste...

The objectives of this work were to address the fundamental characteristics of ansazirconocene catalyzed E/diene copolymerization and E/diene/1-hexene and E/diene/propylene terpolymerizations, and the quantitative relationship between diene structure and polymer chain propagation rate constant in term of quantifiable catalytic active sites. One of...

Structural formations of metal-organic frameworks (MOFs) are predominately composed of empty space pockets inside a honeycomb structure assembled of organic linkers and metal ions, with the exception of a few small pockets of filled spaces. However, these extraordinary filled pockets provide a valuable resource as its applications when it comes thr...

Water pollution, especially by microorganisms and bacteria, is a serious threat to human health. Traditional water disinfection methods are limited by safety and efficiency; therefore, developing simple and environmentally friendly technology with high activity, good stability and low energy consumption for water treatment is necessary. Solar photo...

A Zero‐dimensional/two‐dimensional (0D/2D) tungsten trioxide/graphitic carbon nitride (WO3/g‐C3N4) Z‐scheme hybrid was prepared by employing a simple calcination process. Then, the photocatalytic property of the WO3/g‐C3N4 hybrids was assessed through their efficiency in the degradation of toxic industrial dye pollutant, Rhodamine B (RhB) and pheno...

Replacing Pt-based catalysts with metal-organic frameworks (MOFs) derived single-atom catalysts (SACs) for oxygen reduction reaction (ORR) has largely been impeded by the hidden activity of SACs due to the challenges in exposing unactivated sites and regulating their electronic states. Here we demonstrate the synthesis of highly exposed iron single...

Employing a suitable cocatalyst is very important to improve photocatalytic H2 evolution activity. Herein, two plasmonic cocatalysts, Au nanoparticles and TiN nanoparticles were in-situ coupled over the g-C3N4 nanotube to form a ternary 0D/0D/1D Au/TiN/g-C3N4 composite via a successive thermal polycondensation and chemical reduction method. The g-C...

Correction for ‘Rapid kinetic evaluation of homogeneous single-site metallocene catalysts and cyclic diene: how do the catalytic activity, molecular weight, and diene incorporation rate of olefins affect each other?’ by Amjad Ali et al. , RSC Adv. , 2021, 11 , 31817–31826, DOI: 10.1039/D1RA06243C.

The kinetics and mechanism of ethylene and 5-ethylidene-2-norbornene copolymerization catalyzed by rac -Et(Ind) 2 ZrCl 2 were investigated using 2-thiophenecarbonyl chloride.

The composition of gas or air mixture in a particular gas sensing environment greatly influences the properties, such as surface conductivity of metallic oxide-based gas sensors. In the recent years many native metallic oxide gas sensors, for instance, CuO, ZnO, SnO2, WO3, and α-Fe3O4 have been extensively exploited for their selectivity and sensin...

Developing high-efficient and price-friendly novel cathode catalysts to substitute commercial Pt/C catalyst is extremely vital for the future of fuel cells system, because the oxygen reduction reaction (ORR) is the cornerstone of diverse sustainable energy-conversion technologies. Metal-free heteroatom-doped carbons as ORR catalysts have attracted...

Ab initio investigations of the Mg-based fluoroperovskite XMgF 3 (X = Ga, Al and In) compounds were calculated by using the full-potential linearized augmented plane wave method. The various physical properties were computed using the WIEN2k code. The structural parameters of these compounds agreed with previous predictions within acceptable limits...

Highly efficient and stable metal-free Oxygen Reduction Reaction (ORR) catalyst is derived from low-cost and green biomass, the plum blossom. After activating with KOH and doping with N via introduction of melamine followed by high-temperature treatment, the obtained porous carbon exhibits unique honeycomb like structure and ultra-high surface area...

The intrinsic instability and difficulty in controlling uniform size distributions of cobalt sulfides greatly restrict their application for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) as a bifunctional electrocatalyst in regenerative fuel cells and rechargeable metal-air batteries. Herein, we synthesize a stable electro...

The purpose of this study was to set up guidelines for the sustainability of community energy management (CEM). The process leads to the creation of renewable energy knowledge to be for use in community development under the Sufficiency Economy Philosophy (SEP): There are 9 lessons for building powerful community energy management: Energy learning...