Nickel(II) hydroxide is a well-known material for the oxygen evolution reaction (OER) in alkaline media, particularly when iron incorporated into its lattice. Moderate heat treatment of nickel(II) (≤700 °C) leads to formation oxide (nano)particles, which exhibit reduced OER activity higher temperature was. In this work, we report that air at even temperatures (60 min 900 results an with high superior hydroxide. Similarly, stability under electrochemical conditions increased compared...

Abstract Multiferroic bismuth ferrite, BiFeO 3 , offers a vast landscape to study the interplay between different ferrroic orders. Another aspect which is equally exciting, and yet underutilized, possibility of large-scale ordering domains. Along with symmetry-driven bulk photovoltaic effect, presents opportunities conceptualize novel light-based devices. In this work, we investigate evolution effect in thin films stripe-domain pattern as polarization light modulated from linear elliptical...

We present a spectroelectrochemical setup, in which Raman microscopy is combined with scanning electrochemical (SECM) order to provide both spectroscopic and information on the very same location of an electrode at time. The setup applied subject high academic practical interest, namely, oxygen evolution reaction Ni Ni/Fe electrodes. It comprises transparent substrate electrode, onto thin films are deposited. An ultramicroelectrode (UME) placed closely above obtain information, while...

Porous carbons represent an important group of electrode materials for electrochemical applications due to their high specific surface area, good conductivity, and intrinsic porosity. However, the often-neglected influence porosity on results may lead wrong interpretation data. The aim this work is therefore provide comprehensive understanding effects cyclic voltammetry (CV) – a technique which frequently used initial characterization novel materials. Our approach consists simulating...

A series of K-shaped bolapolyphiles, consisting a p-terphenyl core, two polar glycerol end-groups and swallow-tailed alkyl side-chain were synthesized investigated. By increasing the volume an astonishing variety very different liquid crystalline (LC) phases was observed, ranging from rectangular (Colrec/c2mm) square honeycomb (Colsqu/p4mm) via highly complex zeolite-like octagon/pentagon filled with additional strings rod-bundles (Colrec/c2mm), new 3D-hexagonal (R3;-c) double network phase,...

Raman G-band (a) and 2D-band (b) mapping of oxygen nitrogen treated graphene on an Si-substrate (scale bar 5 μm).

Abstract Functionalized high purity carbon nanotubes (CNTs) with various amounts of oxygen containing surface groups were investigated towards the relevant redox reactions all‐vanadium flow battery. The quinone/hydroquinone peaks between 0.0 and 0.7 V vs. Ag|AgCl|KCl sat. used to quantifying degree functionalization correlated XPS results. Cyclic voltammetry in vanadyl sulfate‐containing 3 M H 2 SO 4 as a common supporting electrolyte showed no influence amount on V(IV)/V(V) system. In...

Abstract In this work, the simultaneous investigation of a single cuprous oxide microcrystal towards CO 2 electroreduction (CRR, reduction reaction) by using Raman microscopy and scanning electrochemical (SECM) is shown. Cu O microcrystals were electrochemically crystallized on an indium‐doped tin oxide‐substrate (ITO). Structural changes are observed in situ microcopy, which indicates their fast conversion into elemental at low overpotentials. Simultaneously, detection products carried out...

A non-noble metal catalyst (Fe-Nx@MWCNTs), which was prepared by wet impregnation of surface-functionalized multi-walled carbon nanotubes (MWCNTs) with iron(II) phthalocyanine (FePc) and heat treatment, as well the functionalized MWCNTs without FePc were examined towards their performance for oxygen reduction reaction (ORR) in neutral media structural properties during electrochemically forced degradation. Electroanalytical methods situ-Raman microscopy ex situ-X-ray photoelectron...

Abstract A method is presented to quantitatively analyze the reduction of vanadium(V) vanadium(IV) over two flat carbon substrates (glassy and graphite foil) using feedback mode scanning electrochemical microscopy. pulse profile validated applied during approach curve experiments a 10 μm Pt microelectrode. By fitting data, electron transfer constants are calculated for various potentials k 0 extracted from corresponding Tafel plot. Furthermore, surface functional groups were introduced by...

Two new commercially available mesoporous graphitic carbon materials were oxygen-functionalized with 0.2 M potassium permanganate solution, 10 nitric acid and a mixture of water, sulfuric in ratio 1:2:1, respectively. Heat treatment the oxidized samples presence urea as nitrogen precursor at 800°C yielded nitrogen-containing surface functional groups. Functionalized are compared to pristine respect structure morphology using TGA, Raman spectroscopy, TEM XPS. The degree oxygen...

Abstract A linear sweep voltammetric procedure applied to scanning electrochemical microscopy is presented investigate carbon materials towards their activity for vanadium redox reactions of relevance flow batteries. experiment performed at an ultramicroelectrode (UME) in close distance electrocatalytically active material, triggering a competition situation where both the UME and material compete same molecule (VO 2+ ). Depending on catalytic potential thus consumption VO , decreased...

Abstract A facile way to prepare a bifunctional electrocatalyst, which is active for both the oxygen evolution reaction (OER) and reduction (ORR) in alkaline media, presented. Ni 0.9 Co 0.1 Fe 2 O 4 mixed oxide, synthesized using polyol mediated synthesis route, combined with nitrogen doped carbon nanotubes (NCNT) known as electrically conducting material high activity ORR. The catalyst was investigated towards its structural properties TEM, XRD, XPS Raman spectroscopy studied relevant...

Optimization of lithium-sulfur batteries highly depends on exploring and characterizing new cathode materials. Sulfur/carbon copolymers have recently attracted much attention as an alternative class cathodes to replace crystalline sulfur. In particular, poly(sulfur-n-1,3-diisopropenylbenzene) (S/DIB) has been under considerable experimental theoretical investigations, promising a good performance in mitigating the so-called shuttle effect. Here, combining ab initio Raman spectroscopy...

Scanning electrochemical microscopy (SECM) is a type of scanning probe (SPM) where an reaction at microelectrode used to generate information about electrochemically (in)active surface in its immediate vicinity. Careful preparation and knowledge the response as well application suitable method enable study spatially resolved kinetics or electrocatalytic activity any structure material. In addition wide range other applications, has become particularly established research field energy...

The electrochemical carbon dioxide reduction reaction (CO2RR) over carbon-supported gold nanoparticles (AuNP) was investigated using a broad variety of (electro)analytical methods, including linear sweep voltammetry with rotating disk electrode (LSV-RDE), sample-generation tip-collection mode scanning microscopy (SG/TC-SECM), as well full cell tests highly sensitive online gas chromatography (GC). In contrast to most other studies, this work focuses on the low-overpotential region (0 −0.4 V...

Abstract Titanium, either in the form of a Ti foil or mesh, was used as novel substrate to grow nitrogen‐doped carbon nanotubes (NCNTs) through chemical vapor deposition at moderate temperatures over electrodeposited iron particles. The thus‐prepared high‐surface‐area electrodes were characterized by scanning electron microscopy (SEM), Raman spectroscopy, and X‐ray photoelectron spectroscopy (XPS). electrochemical performance towards V(IV)/V(V) redox couple investigated cyclic voltammetry....

Gold nanoparticles <10 nm in size are typically prepared using stabilizing agents, e.g. thiolates. Often standard recipes from literature used to presumably remove these stabilisers liberate the surface, for catalytic or electrocatalytic applications, however success of procedures is often not verified. In this work, thiolate-stabilised AuNPs ca. 2 were synthesized and supported onto three different carbon supports, resulting loadings 15 25 wt% Au. These materials post treated methods...