A5057674638- Electrocatalysts for Energy Conversion
- Electrochemical Analysis and Applications
- Molecular Junctions and Nanostructures
- Fuel Cells and Related Materials
- Catalytic Processes in Materials Science
- CO2 Reduction Techniques and Catalysts
- Advanced battery technologies research
- Ionic liquids properties and applications
- Electrodeposition and Electroless Coatings
- Spectroscopy and Quantum Chemical Studies
- Hydrogen Storage and Materials
- Advancements in Solid Oxide Fuel Cells
- Semiconductor materials and devices
- nanoparticles nucleation surface interactions
- Advanced Materials Characterization Techniques
- Catalysis and Hydrodesulfurization Studies
- Radioactive element chemistry and processing
- Gas Sensing Nanomaterials and Sensors
- Ammonia Synthesis and Nitrogen Reduction
- Industrial Gas Emission Control
- Corrosion Behavior and Inhibition
- Advanced Chemical Physics Studies
- Electron and X-Ray Spectroscopy Techniques
- Machine Learning in Materials Science
- Electrostatics and Colloid Interactions
Clarkson University
2020-2025
Leiden University
2018-2022
Pennsylvania State University
2014-2020
Dalian University of Technology
2019
Dalian University
2019
Abstract The successful deployment of advanced energy‐conversion systems depends critically on our understanding the fundamental interactions key adsorbed intermediates (hydrogen *H and hydroxyl *OH) at electrified metal–aqueous electrolyte interfaces. effect alkali metal cations (Li + , Na K Cs ) non‐Nernstian pH shift step‐related voltammetric peak Pt(553) electrode is investigated over a wide window (1 to 13) by means experimental computational methods. co‐adsorbed along step weaken OH...
The CO2 electroreduction reaction (CO2RR) to chemicals and fuels is of both fundamental practical significance, since it would lead a more efficient storage renewable energy while closing the carbon cycle. Here we report enhanced activity selectivity for CO2RR multicarbon hydrocarbons alcohols (∼69% Faradaic efficiency −45.5 mA cm–2 partial current density C2+ at −1.0 V vs RHE) over O2-plasma-activated Cu catalysts via electrolyte design. Increasing size alkali-metal cations in electrolyte,...
Anion-exchange membrane fuel cells hold promise to greatly reduce cost by employing nonprecious metal cathode catalysts. More efficient anode catalysts are needed, however, improve the sluggish hydrogen oxidation reaction in alkaline electrolytes. We report that BCC-phased PdCu alloy nanoparticles, synthesized via a wet-chemistry method with critical thermal treatment, exhibit up 20-fold HOR improvement both mass and specific activities, compared FCC-phased counterparts. activity of is 4...
Although electrochemical hydrogen evolution and oxidation are arguably the best-understood reactions in electrocatalysis, anomalous effect of pH on reaction kinetics has defied simple explanation for decades. This longstanding puzzle exposes gaps fundamental understanding electrocatalysis by showing that singular adsorption descriptors (e.g., binding energy) cannot describe kinetic effects across electrolytes. In this Perspective, we discuss strengths shortcomings energies as HER/HOR...
Abstract Development of reversible and stable catalysts for the electrochemical reduction CO 2 is great interest. Here, we elucidate atomistic details how a palladium electrocatalyst inhibits poisoning during both formic acid oxidation to carbon dioxide acid. We compare results obtained with platinum single-crystal electrode modified without single monolayer palladium. combine (high-scan-rate) cyclic voltammetry density functional theory explain absence on palladium-modified electrode. show...
Platinum electrode cyclic voltammograms show features at low potentials which correspond to adsorption/desorption processes on Pt(111), Pt(100), and Pt(110) facets that have traditionally been ascribed hydrogen adsorption. The 100 110 associated exhibit a dependence pH beyond the expected Nernstian shift. Herein we use density functional theory (DFT) explain these shifts. We examine specific adsorption of hydrogen, hydroxide, water, potassium onto index platinum, Pt(110). In support growing...
The presence of alkali cations in electrolyte solutions is known to impact the rate electrocatalytic reactions, though mechanism such not conclusively determined. We use density functional theory (DFT) examine specific adsorption fcc(111) electrode surfaces, as may block catalyst sites or otherwise surface catalytic chemistry. Solvation cation–metal structure was investigated using explicit water models. Computed equilibrium potentials for cation suggest that and alkaline earth will...
Electrolytic ions are known to impact the rates of electrocatalytic reactions, though a molecular understanding mechanism such is not well understood. We employ density functional theory investigate specific adsorption potassium and iodine on Cu (111), (100) (211) electrode surfaces under CO2 electroreduction (CO2 ER) conditions explore their effect reaction energetics binding strength intermediates. The calculated equilibrium potentials for K* I* (* denotes surface-adsorbed species) suggest...
The effect of the alkali-metal cation (Li+, Na+, K+, and Cs+) on non-Nernstian pH shift Pt(554) Pt(533) step-associated voltammetric peak is elucidated over a wide window (1-13), through computation experiment. In conjunction with our previously reported study Pt(553), step-induced found to be independent step density orientation. prior work, we explained sharp as due exchange between adsorbed hydrogen hydroxyl along result adsorption an its subsequent weakening adsorption. Our functional...
Cathodic corrosion is an electrochemical etching process that alters metallic surfaces by creating nanoparticles and a variety of features. Because these features typically have preferential orientation, cathodic can be applied to modify nanostructure electrode surfaces. However, this application currently limited insufficient chemical understanding its underlying mechanism. This includes the role alkali metal cations, which are thought crucial in both enabling controlling final facet...
The excellent alkaline HOR electrocatalytic performance on Pd<sub>1−x</sub>Ir<sub>x</sub>/N-C arises from the appropriate strength of hydrogen binding and strongest oxophilic property.
Oxide formation plays an important role in the degradation of Pt electrocatalysts. However, exact oxide structure and reaction mechanism are not fully understood. Here, we used situ surface X-ray diffraction experiments to resolve at a Pt(111) model electrode potentials near onset oxygen evolution reaction. Fast possible by using photons with high kinetic energy combination large 2D detector. By employing very low potential sweep rates obtain more ordered oxidized compared literature data...
Abstract Density functional theory (DFT) calculations are used to examine hydrogen and hydroxide adsorption on stepped Pt(553) Pt(533) surfaces simulate the associated cyclic voltammograms in both basic acidic electrolytes. Hydrogen surface species active intermediates or spectator many important electrocatalytic reactions, such as oxidation, oxygen reduction, methanol oxidation. We of hydrogen, hydroxide, water, a sodium cation onto platinum surfaces, Pt(533). Owing strong (with co‐adsorbed...
Abstract The successful deployment of advanced energy‐conversion systems depends critically on our understanding the fundamental interactions key adsorbed intermediates (hydrogen *H and hydroxyl *OH) at electrified metal–aqueous electrolyte interfaces. effect alkali metal cations (Li + , Na K Cs ) non‐Nernstian pH shift step‐related voltammetric peak Pt(553) electrode is investigated over a wide window (1 to 13) by means experimental computational methods. co‐adsorbed along step weaken OH...
Specific adsorption of anions is an important aspect in surface electrochemistry for its influence on reaction kinetics either a promoted or inhibited fashion.
The adsorption of anions onto metal surfaces is important in many applications including effective (electro)catalyst design, surface modification, and contaminant removal wastewater treatment. In electrocatalysis, can be both reactive intermediates or site-blocking spectators, where their strength therefore dictates the rate reaction. this work, we have measured energy a series carboxylic acids on Pt (111) single-crystal electrode from aqueous solution. We find that carboxylate anion...
Platinum is a widely used catalyst in aqueous and electrochemical environments. The size shape of Pt nanoparticles the faceting (and roughness) extended surfaces change during use these environments due to dissolution, growth, reconstruction. Further, many nanoparticle synthesis techniques are carried out an environment. surface structures formed impacted by relative energies low index facets Density functional theory calculate energy platinum as function potential coverage adsorbed...