Abstract Fe‐N‐C catalysts with high O 2 reduction performance are crucial for displacing Pt in low‐temperature fuel cells. However, insufficient understanding of which reaction steps catalyzed by what sites limits their progress. The nature were investigated that active toward H reduction, a key intermediate during indirect and source deactivation Catalysts comprising different relative contents FeN x C y moieties Fe particles encapsulated N‐doped carbon layers (0–100 %) show both types...

Abstract Anion exchange membrane water electrolysis (AEMWE) is an attractive method for green hydrogen production. It allows the use of non‐platinum group metal catalysts and can achieve performance comparable to proton electrolyzers due recent technological advances. While current systems already show high performances with available materials, research gaps remain in understanding electrode durability degradation behavior. In this study, tracking a Ni 3 Fe–LDH‐based single‐cell implemented...

Abstract This study explores the effect of nickel cobalt oxide (Ni‐Co‐O) anode layer microstructure on oxygen evolution reaction (OER). Four anodes with similar Ni‐Co‐O loadings and chemical characteristics but distinct morphologies are fabricated by ultrasonic spraying catalyst inks varying solvent composition (pure water versus a water‐ethanol mixture) drying temperatures (50 150 °C) (Ni) plates. Upon composition, particles in water‐based ink exhibited lower stability than...

We report a simple and effective electrochemical method to remove Fe impurities from commercial KOH electrolyte. therefore utilize MoS2 catalyst deposited on porous Ni foam as both the anode cathode in two-electrode electrolysis setup. After 12 h of constant galvanostatic at 100 mA, electrolyte were successfully removed, confirmed by means inductively coupled plasma optical emission spectroscopy analysis. In purified KOH, Ni–Co3O4 composite oxide showed no Fe-induced activation. contrast, we...

The recent mechanistic understanding of active sites, adsorbed intermediate products, and rate-determining steps (RDS) nitrogen (N)-modified carbon catalysts in electrocatalytic oxygen reduction (ORR) evolution reaction (OER) are still rife with controversy because the inevitable coexistence diverse N configurations technical limitations for observation formed intermediates. Herein, seven kinds aromatic molecules designated single species used as model structures to investigate explicit role...

The electrochemical reduction of CO2 from flue gas or direct air capture to relevant syngas mixtures is a promising route toward mitigation environmental pollution and production bulk chemicals fuels. Among the different cell types, gas-fed zero-gap electrolyzers are as energy-efficient scalable devices. We herein investigate influence operational parameters related cathode water management, such orientation, humidification, compression onto CO2R. By stepwise optimization our not yet fully...

The activity of nickel‐based electrocatalysts towards the oxygen evolution reaction (OER) is influenced by presence alkali metal cations in electrolyte. Since underlying mechanism not fully resolved yet, we conducted a study combining Raman, FTIR, and photoelectron spectroscopies. We found that an improved OER correlates with structural changes catalyst. are adsorbed increasing amounts order Li+ < Na+ K+ Cs+, opening layers NiOOH layered double‐hydroxide structure promoting transition...

Abstract The abundance of available surface chemical information and edge structures carbon materials have attracted tremendous interest in catalysis. For the oxygen evolution reaction (OER), effects rarely been studied detail because complexity various coexisting configurations controversy between corrosion Herein, exact roles common active sites OER were interrogated using polycyclic aromatic hydrocarbons (PAHs) with designated (zigzag armchair) as model probe molecules, a focus on...

Elaborated and uniform experimental protocols are a prerequisite for OER catalyst evaluation via RDE. Still, individual sample preparation variations in microenvironment can lead to significant spread of results between different laboratories.

Abstract Alkaline water electrolysis remains one of the most promising technologies for large‐scale production green hydrogen. However, further increases in efficiency remain elusive, as new electrode materials that are highly efficient laboratory cannot maintain their performance under industrial conditions. Within this work, we present a beaker cell setup, which relevance research can already be investigated by applying Thus, setup allows testing at 80 °C 30 wt. % KOH more than 300 hours....

Since a few years, non-precious metal catalysts with iron or cobalt as active centers show sufficient activity to be viable candidates electrocatalysts for the oxygen reduction reaction (ORR) in polymer electrolyte membrane fuel cells (PEMFC). They can sustain substantial current densities when operated at low potentials. However, their stabilization high cathode potentials, necessary energy efficiency, remains daunting task. Here an Fe-N-C catalyst is stabilized over whole potential range...

Abstract To meet the rising demand for green hydrogen, efficient alkaline water electrolysis demands highly active and low‐cost electrocatalysts oxygen evolution reaction (OER). We address this issue by focusing our work on optimizing conditioning of promising Ni‐(Fe)‐based electrodes to improve their electrocatalytic performances. Systematic parameter variation cyclic voltammetry revealed that a large potential window, low scan rate, high number cycles result in improved activation. If time...

Abstract In this study, we developed a statistical framework, named multistage data quantification (MSDQ), to evaluate representative surface characteristics such as roughness, area, and homogeneity score of cobalt oxide‐based anodes, contributing deeper insight into the quality anode surface. Atomic force microscopy (AFM) was employed capture morphology two anodes that have comparable loading oxide but exhibit distinct morphological features. Application MSDQ exposed notable disparities in...

Abstract Understanding the sheet resistance of porous electrodes is essential for improving performance polymer electrolyte membrane (PEM) water electrolyzers and related technologies. Despite its importance, existing methods often fail to provide reliable comprehensive data, especially materials with complex morphologies non‐uniform thicknesses. This study introduces a robust straightforward method determining using novel probe concept based on industrial printed circuit board (PCB)...

Abstract The electrification of the formaldehyde synthesis is investigated as a sustainable alternative to current thermal approach. formation in anhydrous methanol achieves higher Faraday efficiencies than aqueous conditions, yet operates at cell potentials. electrolyte an influential factor, and its role not understood. Here, we report on electrolyte's effect electrochemical methanol. After screening, four electrolytes were chosen for in‐depth analysis supporting ion influence. Among...

Abstract The oxygen evolution reaction (OER) is one of the bottlenecks electrochemical water splitting. Metal‐free carbons from biomass are highly abundant and can be easily synthesized. Their low price, high conductivity functionalization makes them promising materials. Herein, we report about free‐standing carbon electrodes as electrocatalysts for OER. In contrast to powder‐based catalysts, not only avoid additives, but also facilitate post analysis better reflect industrial conditions....

Abstract Fe‐N‐C catalysts with high O 2 reduction performance are crucial for displacing Pt in low‐temperature fuel cells. However, insufficient understanding of which reaction steps catalyzed by what sites limits their progress. The nature were investigated that active toward H reduction, a key intermediate during indirect and source deactivation Catalysts comprising different relative contents FeN x C y moieties Fe particles encapsulated N‐doped carbon layers (0–100 %) show both types...

Abstract A preselection of catalysts by screening their performance prior to intensive analysis can save a lot time and money. commonly applied tool is the rotating disk electrode setup. For powder materials, however, measured electrocatalytic be influenced various experimental parameters. Here, nickel cobalt mixed‐oxide investigated as model catalyst for oxygen evolution reaction in alkaline media. The determined electrochemical upon variation ink composition, loading, electrolyte...

Dry formaldehyde was electrochemically produced from methanol at ambient conditions. Faraday efficiencies of up to 90% were achieved and the reaction successfully scaled-up a flow cell approach industrially relevant operation

Abstract Die reichlich vorhandenen oberflächenchemischen Informationen und Kantenstrukturen von Kohlenstoffmaterialien haben ein enormes Interesse auf dem Gebiet der Katalyse geweckt. Für die Sauerstoffentwicklungsreaktion (OER) wurden Kanteneffekte aufgrund verschiedener nebeneinander existierender Kantenkonfigurationen selten im Detail untersucht. Zudem besteht eine Kontroverse zwischen Kohlenstoffkorrosion Kohlenstoffkatalyse. Kohlenstoffkatalyse Hier werden genauen Rollen gemeinsamen...