Electrolysis at Nickel One drawback of solar and wind power is the need for an efficient storage system to release accumulated energy when neither source readily available (during still nights, example). Hydrogen derived from electrolysis water potentially a useful medium this purpose, but catalyzing interconversion efficiently large scale would currently require substantial amount scarce precious metal platinum. An alternative approach be mimic natural enzymatic reactions, which accomplish...

Fuel cell reactions invariably involve an oxygen reduction reaction (ORR) at the cathode, which is one of main rate-decreasing steps on platinum (Pt)-catalysts in water formation and energy conversion efficiency polymer electrolyte membrane fuel cells (PEMFCs). The Pt scarcity cost have led to development alternative catalyst materials for applications. This paper reviews ORR catalysts with regard their classification, mechanism, activity performances. From conventional Pt-based non-noble...

Molecules of bisthiolterthiophene have been adsorbed on the two facing gold electrodes a mechanically controllable break junction in order to form metal-molecule(s)-metal junctions. Current-voltage $(I\ensuremath{-}V)$ characteristics recorded at room temperature. Zero bias conductances were measured 10--100 nS range and different kinds nonlinear $I\ensuremath{-}V$ curves with steplike features reproducibly obtained. Switching between could be induced by varying distance metallic electrodes....

Go with the CO: The functionalization of multiwalled carbon nanotubes molecular complexes through π–π stacking produces robust, noble-metal-free electrocatalytic nanomaterials for H2 evolution and uptake. catalysts are compatible conditions encountered in classical proton-exchange membrane devices tolerant common pollutant CO, thus offering significant advantages over traditional Pt-based catalysts. Detailed facts importance to specialist readers published as "Supporting Information". Such...

Covalent surface modification of conductive, semiconductive, and insulating substrates with thin organic polymers films induced by redox activation aryl diazonium salts in the presence vinyl monomers has been investigated acidic aqueous media. This new process, called diazonium-induced anchoring process (DIAP), is an efficient technique to impart covalent adhesion polyvinyl coatings onto raw inorganic or surfaces without any conductivity requirement. Typically, are reduced iron powder give...

One of the major limitations yet to global implementation polymer electrolyte membrane fuel cells (PEMFCs) is cathode catalyst. The development efficient platinum-free catalysts key issue solve problem slow kinetics oxygen reduction reaction (ORR) and high cost. We report a promising catalyst for ORR prepared through annealing treatment under inert conditions cobalt-benzotriazole (Co-BTA) complex supported on carbon nanotubes (CNTs). N-rich benzotriazole precursor was chosen based its...

The attempt to decorate carbon nanotubes with organic molecules as a powerful means form new functional materials has attracted broad attention in the scientific community. Here, we report functionalization of single-walled (SWNTs) zinc porphyrins (ZnP) using very mild conditions afford series SWNTs−ZnP (1 and 2) electron donor−acceptor conjugates. Owing presence either one or two ZnP, introduced via "click chemistry", different absorption cross sections were realized. Important this context...

The spontaneous reaction of diazonium salts on various substrates has been widely employed since it consists a simple immersion the substrate in salt solution. As electrochemical processes involving same salts, grafting is assumed to give covalently poly(phenylene)-like bonded films. Resistance solvents and ultrasonication commonly accepted as indirect proof existence covalent bond. However, most relevant attempts demonstrate metal-C interface bond have obtained by an XPS investigation...

We report experimental and theoretical evidence of surface effects in the Ni $2p$ x-ray photoemission spectra (XPS) NiO. The $2{p}_{3∕2}$ surface-enhanced XPS a NiO sample show relative enhancement intensity known satellite at $1.5\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ higher binding energy from main line, indicating considerable contribution this satellite. results are discussed terms bulk-octahedral surface-pyramidal symmetries. Other contributions, like nonlocal screening effects, cannot...

Abstract Using asymmetric catalysis to simultaneously form carbon–carbon bonds and generate single isomer products is strategically important. Suzuki-Miyaura cross-coupling widely used in the academic industrial sectors synthesize drugs, agrochemicals biologically active advanced materials. However, applicable enantioselective variations provide 3D molecules remain elusive. Here we report a rhodium-catalysed reaction with important partners including aryls, vinyls, heteroaromatics...

Abstract Electrografting is a powerful and versatile technique for modifying decorating conducting surfaces with organic matter. Mainly based on the electro‐induced polymerization of dissolved electro‐active monomers metallic or semiconducting surfaces, it finds applications in various fields including biocompatibility, protection against corrosion, lubrication, soldering, functionalization, adhesion, template chemistry. Starting from experimental observations, this Review highlights...

A new, efficient, palladium- and chromium-free process for the electroless plating of acrylonitrile-butadiene-styrene (ABS) polymers has been developed. The is based on ion-exchange properties poly(acrylic acid) (PAA) chemically grafted onto ABS via a simple one-step method that prevents using classical surface conditioning. Hence, can be obtained in three steps, namely: (i) grafting PAA ABS, (ii) copper Cu0 seeding surface, (iii) nickel or metallization commercial-like bath. IR, XPS, SEM...

An organic solar cell based on a poly-3-hexylthiophene (P3HT):phenyl-C61-butyric acid (PCBM) bulk hetero-junction was directly coupled to molybdenum sulfide resulting in the design of new type photocathode for production hydrogen. Both light-harvesting system and catalyst were deposited by low-cost solution-processed methods, i.e. spin coating spray respectively. Spray-coated MoS3 films are catalytically active strongly acidic aqueous solutions with best efficiencies thicknesses 40 90 nm....

Abstract The “ligand induced electroless plating (LIEP) process” is a simple process to obtain localized metal onto flexible polymers such as poly(ethylene terephtalate) and polyvinylidene fluoride sheets. This generic cost‐effective process, efficient on any common polymer surface, based the covalent grafting by GraftFast of thin chelating film, poly(acrylic acid), which can complex copper ions. entrapped ions are then chemically reduced in situ resulting Cu 0 species act seed layer for...

The relationship between the morphology of polypyrrole and their electrocatalytic performances towards oxygen reduction reaction (ORR) in alkaline media is described; annealed with granular- tubules-like exhibited different catalytic efficiencies.

Robuste Elektrokatalysatoren für die H2-Freisetzung und -Aufnahme entstehen durch Funktionalisierung mehrwandiger Kohlenstoffnanoröhren mit molekularen Komplexen über π-Stapelung. Die edelmetallfreien Nanomaterialien haben Vorteile gegenüber herkömmlichen Platinkatalysatoren, weil sie kompatibel den Arbeitsbedingungen in Protonenaustauschmembran-Systemen unempfindlich gegen CO sind.

A series of eight symmetrically substituted diketopiperazines (DKPs) derived from 1-amino-1-carboxycycloalkanes (n = 3−7; 3,3,5,5-tetramethylcyclohexane; 4,4-dimethylcyclohexane; 2-indan) were synthesized and their crystal structures determined. In the solid state, all compounds form two pairs hydrogen bonds with adjacent molecules to a one-dimensional structure that we refer as "tapes". These represent range volumes shapes contain common molecular fragment (DKP ring). We examined this three...

This paper demonstrates the use of microcontact printing (μCP) and capillary filling (CF) to pattern deposition iron oxides on a surface with feature sizes microns. Selective wetting both self-assembled monolayers (SAMs) alkanethiolates gold alkylsiloxanes Si/SiO2 formed by limited hydrophilic areas surfaces; thereby, chemical functionality SAM had only minor influence behavior deposition. The were deposited either as magnetite particles from colloidal solution, precipitation oxide...

The formation of the two dimeric species [(TTF)2]+˙ and (TTF+˙)2 can be monitored by complexation Na+ on a calix[4]arene–TTF assembly.

In situ generation of indium catalyst droplets and subsequent growth crystalline silicon nanowires on ITO by plasma-enhanced CVD are reported, the wurtzite (Si–IV) phase is clearly evidenced in some wires.