A5068389590- Electrocatalysts for Energy Conversion
- Electrochemical Analysis and Applications
- Advanced battery technologies research
- CO2 Reduction Techniques and Catalysts
- Fuel Cells and Related Materials
- Ionic liquids properties and applications
- Machine Learning in Materials Science
- Semiconductor materials and devices
- Hydrogen Storage and Materials
- Web Data Mining and Analysis
- Oral and gingival health research
- Periodontal Regeneration and Treatments
- Nanoporous metals and alloys
- Caching and Content Delivery
- Dental Implant Techniques and Outcomes
- Salivary Gland Disorders and Functions
- Integrated Circuits and Semiconductor Failure Analysis
- Oral microbiology and periodontitis research
- Cloud Computing and Resource Management
- Dental Health and Care Utilization
- Advancements in Semiconductor Devices and Circuit Design
Leiden University
2020-2024
Rajasthan University of Health Sciences
2022-2024
Gold is one of the most selective catalysts for electrochemical reduction CO2 (CO2RR) to CO. However, concomitant hydrogen evolution reaction (HER) remains unavoidable under aqueous conditions. In this work, a rotating ring disk electrode (RRDE) setup has been developed study quantitatively role mass transport in competition between these two reactions on Au surface 0.1 M bicarbonate electrolyte. Interestingly, while faradaic selectivity CO formation was found increase with enhanced (from...
In this article we investigate the electrochemical reduction of CO2 at gold electrodes under mildly acidic conditions. Differential mass spectroscopy (DEMS) is used to quantify amounts formed hydrogen and carbon monoxide as well consumed amount CO2. We how Faradaic efficiency CO formation affected by partial pressure (0.1–0.5 bar) proton concentration (1–0.25 mM). Increasing former enhances rate suppresses evolution from reduction, leading efficiencies close 100%. Hydrogen suppressed all...
ConspectusThe electrochemical reduction of CO2 (CO2RR) constitutes an alternative to fossil fuel-based technologies for the production fuels and commodity chemicals. Yet application CO2RR electrolyzers is hampered by low energy Faradaic efficiencies. Concomitant reactions, like hydrogen evolution (HER), lower selectivity, while conversion into (bi)carbonate through solution acid-base reactions induces additional concentration overpotential. During in aqueous media, local pH becomes more...
Abstract In this work we study the role of alkali metal cation concentration and electrolyte pH in altering kinetics hydrogen evolution reaction (HER) at gold (Au) electrodes. We show that moderately alkaline (pH 11), increasing significantly enhances HER activity on Au electrodes (with a order ≈0.5). Based these results suggest cations play central stabilizing transition state rate‐determining Volmer step by favorably interacting with dissociating water molecule (*H–OH δ− –cat + )....
In this work, we study how the cation identity and concentration alter kinetics of hydrogen evolution reaction (HER) on platinum gold electrodes. A previous work suggested an inverted activity trend as a function alkali metal when comparing performance catalysts in alkaline media. We show that weakly hydrated cations (K+) favor HER only at low overpotentials (or lower alkalinity), whereas more pH high overpotentials), higher is observed using electrolytes containing strongly (Li+). find...
The electrochemical reduction of CO2 aims to be a central technology store excess electricity generated by wind and solar energy. However, the reaction is hindered competition with hydrogen evolution reaction. In this paper, we present detailed quantitative study Faradaic efficiency (FE) CO on gold electrode under well-defined mass-transport conditions using rotating ring-disk voltammetry. Varying concentration bicarbonate electrolyte cation employing different rotation rates, map out how...
The kinetics of hydrogen evolution reaction (HER) in alkaline media, a central to water electrolyzers, is not accurately captured by traditional adsorption-based activity descriptors. As result, the exact mechanism and main driving force for reduction or HER rate remain hotly debated. Here, we perform extensive kinetic measurements on pH- cation-dependent Pt single-crystal electrodes conditions. We find that cations interacting with step sites control activity, while they interact only...
In this work, we employ differential electrochemical mass spectrometry (DEMS) to track the real-time evolution of CO at nanoporous gold (NpAu) catalysts with varying pore parameters (diameter and length) during 2 reduction reaction (CO RR).
The exact mechanism behind the cation-assisted hydrogen oxidation reaction (HOR) on platinum electrodes in alkaline media remains disputed. We show that cation effects at display a remarkable structure sensitivity: not only H adsorption but also HOR activity (111) terrace sites are independent of nature and concentration. On (110) step sites, low concentration mildly media, cations promote HOR, whereas more pH consequently higher near-surface concentrations, is inhibition by cations....
In this work, we present an in-depth study of the role mass transport conditions in tuning hydrogen evolution kinetics on gold by means rotation rate control. Interestingly, find that reaction (HER) activity decreases with increasing electrode. As increase (mass transport) rate, locally generated hydroxyl ions (2H2O +2e− → H2 + 2OH−) are transported away from electrode surface at accelerated rate. This results decreasing local pH and, because need to satisfy electroneutrality, near-surface...
Abstract In this work we study the role of alkali metal cation concentration and electrolyte pH in altering kinetics hydrogen evolution reaction (HER) at gold (Au) electrodes. We show that moderately alkaline (pH 11), increasing significantly enhances HER activity on Au electrodes (with a order ≈0.5). Based these results suggest cations play central stabilizing transition state rate‐determining Volmer step by favorably interacting with dissociating water molecule (*H–OH δ− –cat + )....
Status of bone-implant interface or osseointegration can be assessed by using resonance frequency analysis (RFA), which measures implant stability. A modified surface significantly enhance and reduce healing period. Platelet-rich fibrin (PRF) consists mesh with entrapped platelets leukocytes that release a huge number growth factors contribute to wound tissue regeneration.The present study aims evaluate the effect PRF on in terms stability.This was split-mouth randomized clinical trial.Sixty...
Data - structured, semi-structured and unstructured is growing at an exponential rate. Most organizations are dependent on this huge volume of data to make real time decisions. To provide accurate information these decision making models, it crucial that the superior quality. Since most migrating from relational NoSQL databases, vital validate after migration process. Considering different structures two process validation a formidable task. This paper talks about approach between cross...
The aim of our pilot study is to analyze the relationship between dental caries and albumin calcium levels in serum saliva adolescent patients with varying experience as determined by their progression age-group 9 19 years.