Challenges in bimetallic multilayer structure formation: Pt growth on Cu monolayers on Ru(0001)

In a joint experimental and theoretical study, we investigate the formation and morphology of PtCu/Ru(0001) bimetallic surfaces grown at room and higher temperatures under UHV conditions.</p

Progress and Perspectives of Electrochemical CO₂ Reduction on Copper in Aqueous Electrolyte

To date, copper is the only heterogeneous catalyst that has shown a propensity to produce valuable hydrocarbons and alcohols, such as ethylene and ethanol, from electrochemical CO2 reduction (CO2R). There are variety of factors that impact CO2R activity and selectivity, including the catalyst surface structure, morphology, composition, the choice of electrolyte ions and pH, and the electrochemical cell design. Many of these factors are often intertwined, which can complicate catalyst discovery and design efforts. Here we take a broad and historical view of these different aspects and their complex interplay in CO2R catalysis on Cu, with the purpose of providing new insights, critical evaluations, and guidance to the field with regard to research directions and best practices. First, we describe the various experimental probes and complementary theoretical methods that have been used to discern the mechanisms by which products are formed, and next we present our current understanding of the complex reaction networks for CO2R on Cu. We then analyze two key methods that have been used in attempts to alter the activity and selectivity of Cu: nanostructuring and the formation of bimetallic electrodes. Finally, we offer some perspectives on the future outlook for electrochemical CO2R

Electric Potential Distribution Inside the Electrolyte During High Voltage Electrolysis

Applying an external potential difference between two electrodes leads to a voltage drop in an ion conducting electrolyte. This drop is particularly large in poorly conducting electrolytes and for high currents. Measuring the electrolyte potential is relevant in electrochemistry, e.g., bipolar electrochemistry, ohmic microscopy, or contact glow discharge electrolysis. Here we study the course of the electrolyte potential during high voltage electrolysis in an electrolysis cell using two reversible hydrogen electrodes as reference electrodes, placed at different positions in the electrolyte. The electrolysis is performed with a Pt working and stainless steel counter electrode in a KOH solution. A computational COMSOL® model is devised which supports the experimentally obtained potential distribution. The influence of the cell geometry on the electrolyte potentials is evaluated. Applying the knowledge of the potential distribution to the formation of a Au oxide surface structure produced during high voltage electrolysis, we find that the amount of oxide formed is related to the current rather than the applied voltage

Using auxiliary electrochemical working electrodes as probe during contact glow discharge electrolysis: A proof of concept study

Plasma in-liquid by means of anodic contact glow discharge electrolysis (aCGDE) is a grow- ing research field allowing the selective modifi- cation of the electrode and the electrolyte. The aim of this proof of concept study is to demon- strate that auxiliary electrochemical electrodes placed in vicinity to the plasma electrode, can be modified by aCGDE. Furthermore, we illus- trate in how far such auxiliary electrodes can be used as a probe to detect products (in particu- lar H2 , H2O2 , and O2 ) formed in the solution by aCGDE via electrochemical techniques. In this work aCGDE is achieved by applying a voltage of 580 V to a small Pt wire (plasma electrode) vs. a large stainless steel counter electrode. An auxiliary Pt electrochemical working electrode, operated in a three electrode configuration, is placed at different distances from the plasma working electrode. Depending on the distance, we find small changes in the electrode struc- ture. More importantly, we will show that in principle the local H2 O2 concentration in the electrolyte can be monitored operando. After aCGDE the concentration changes with time and depends on the distance from the plasma electrode

svgdigitizer

&lt;p&gt;svgdigitizer is a Python library and command line tool to recover the measured data underlying plots in scientific publications.&lt;/p&gt