Impact of Structural Heterogeneities in Hierarchically Grown Microribbons on 2D WS2 Monolayer on the Measured Local Hydrogen Evolution Activity on Au Substrate Laud Anim Adofo, Alejandro E. Pérez Mendoza, Miran Joo, Lithin Madayan‐Banatheth, Andrew Ben‐Smith, et al. Small, 2026 Homoepitaxial growth of highly crystalline microribbons on large‐area 2D transition metal dichalcogenide (TMD) monolayers is often facilitated by molten salt chemical vapor deposition (CVD) via the vapor–liquid–solid growth method. These microribbons are vertically stacked TMD monolayer stripes that exhibit well‐defined edge structures, introducing spatial heterogeneities across the basal plane of their 2D monolayer supports. Although frequently observed in CVD‐grown TMDs, their influence on local electrocatalytic behavior remains poorly understood. Here, we use scanning electrochemical cell microscopy (SECCM), combined with correlative microscopy and spectroscopy, to spatially resolve the hydrogen evolution reaction (HER) activity of WS 2 monolayer decorated with microribbons at nanometer resolution. Quantitative analysis of over 33 000 localized electrochemical measurements reveals that monolayer edges exhibit twice the catalytic activity of the basal plane, while single‐ and multilayer microribbons suppress HER activity by over 5‐ and 10‐fold, respectively, due to interlayer coupling and sluggish charge transport from the underlying Au substrate. Overall, this work reveals how microribbons modulate basal plane activity in 2D WS 2 on metallic Au substrate and demonstrates how co‐localization of SECCM with various spectroscopies can be used as a powerful technique for mapping nanoscale catalytic activity across structurally complex TMD surfaces.
Impact of the Gas Atmosphere at the Triple Boundary Phase on the Measured Oxygen Evolution Reaction Activity of Ni2B/Ni3B Electrocatalysts Lithin Madayan‐Banatheth, Alejandro E. Perez‐Mendoza, Ulrich Burkhardt, Iryna Antonyshyn, Corina Andronescu Small Methods, 2026 The evaluation of the oxygen evolution reaction (OER) electrocatalytic activity of established electrocatalysts is key for the rational design of new electrocatalysts. In this study, scanning electrochemical cell microscopy (SECCM) is employed to assess, under identical conditions, the OER electrocatalytic activity of Ni 2 B and Ni 3 B, simultaneously present in a Ni 70 B 30 ingot. An important finding is that the gas environment surrounding the nanodroplet formed at the tip of the SECCM probe and the Ni 70 B 30 ingot impacts the measured current density. The presence of a gas flowing (air, Ar, CO 2 , and O 2 ) outside the electrolyte droplet increases the measured OER current recorded on both phases, compared to a situation without gas convection, revealing one of the key parameters that can be used to enable higher OER current densities to be recorded on the same catalyst. Notably, the presence of CO 2 , even in small concentrations (2% O 2 in Ar) in the surrounding atmosphere, leads to a significant apparent decrease of the OER activity. The study reveals that Ni 3 B shows an almost 20% enhanced OER electrocatalytic activity compared to Ni 2 B, which contradicts previous findings and highlights the importance of precisely controlled experiments enabled by SECCM when establishing catalytic trends.
Quantification of Gaseous Products Evolved at Industrially Relevant Current Densities During CO2 Electroreduction and Water Electrolysis Using Online Gas Chromatography Raíssa Ribeiro Lima Machado, Bright Nsolebna Jaato, Torsten Claus Schmidt, Ignacio Sanjuán, Corina Andronescu Advanced Energy and Sustainability Research, 2026 The quantification of gaseous chemicals such as CO and H2, obtained during the electrochemical reduction of CO2 or water using online gas chromatography (GC), is extremely relevant for the evaluation of an electrolysis system's performance. Herein, the causes that may hinder the proper calculation of Faraday efficiencies, when applying industrially relevant current densities, are demonstrated for both water electrolysis and CO2 electroreduction (eCO2RR). The findings highlight that rigorous calibration and an understanding of GC linearity and detection limits are essential for accurate measurement and quantification. Furthermore, the implementation of product dilution immediately after the electrocatalytic reactor, prior to GC analysis, is introduced as a versatile approach that enables reliable product quantification across different applied current densities and GC systems.
Laser-Induced Iron Doping of Spinel Thin Film Electrocatalyst: Impact of Pulsed Laser Processing on Surface Cobalt Oxide Doping and Oxygen Evolution Reaction Activity Dana Schellenburg, S. Shukla, A. E. P. Mendoza, L. M. Banatheth, C. H. Scharf, et al. Chemcatchem, 2026 Laser‐based synthesis of heterogeneous catalysts enables the scalable production of highly pure, defect‐rich nanoparticles through kinetic control. Recently, pulsed laser defect engineering in liquids (PUDEL) was developed to tailor cation occupancy in spinel nanoparticles with single‐pulse precision, using a liquid jet to deliver particles into a repetition‐rate‐matched laser beam. While PUDEL has been successfully applied to nanoparticle suspensions, its transfer to thin film catalysts remains unexplored. Here, we apply PUDEL to cobalt oxide thin films using iron‐containing liquids to investigate pulse‐dependent Fe doping. Iron cations are kinetically incorporated into the spinel surface from the liquid phase at millimolar concentration, pulse by pulse. The doping depth, characterized by time‐of‐flight secondary ion mass spectrometry (TOF‐SIMS), scales with the number of laser pulses and directly influences electrocatalytic oxygen evolution activity. We identify an optimum at three laser pulses, where Fe incorporation significantly enhances catalytic performance, consistent with earlier findings in nanoparticle powders. This demonstrates that PUDEL enables precise surface doping of Co 3 O 4 thin films, offering an alternative to conventional bulk doping strategies. Our results highlight the potential of surface‐selective, laser‐assisted methods to rationally design active sites in spinel‐type electrocatalysts.
Accelerated aerogel development via Soxhlet extraction and freeze-drying Felix Leven, Mavin Geyer, Elisabeth Huth, Corina Andronescu, Rainer Ostermann Materials Advances, 2026 The tedious and time-consuming solvent exchange during aerogel production was sped up using a standard Soxhlet extractor. This allowed the rapid adaptation of silica and polyurethane aerogels to be even prepared by freeze-drying.
Electrocatalysis in confined space Corina Andronescu, Justus Masa, Richard D. Tilley, John J. Gooding, Wolfgang Schuhmann Current Opinion in Electrochemistry, 2021
Phenolated methyloleate-based poly(benzoxazine) films as corrosion protection layers on zn/mg/al-alloy coated steel UPB Scientific Bulletin Series B Chemistry and Materials Science, 2016
Assessment of maleinization degree of linseed oil from spectral data Revista De Chimie, 2016
Novel biocomposites based on polyhydroxyalkanoates-layered double hydroxides for tissue engineering applications UPB Scientific Bulletin Series B Chemistry and Materials Science, 2016
Influence of curing protocol of benzoxazine monomer based on aromatic diamines against the degradation behaviour of the resulted polybenzoxazines Materiale Plastice, 2013
Novel ureido-4'-aminobenzo-15-crown-5-ether periodic mesoporous silicas Digest Journal of Nanomaterials and Biostructures, 2013
Structural characterisation and luminescence properties of paramagnetic Mn doped SnO2 nanopowders obtained via simple buthanol assisted sol-gel synthesis Digest Journal of Nanomaterials and Biostructures, 2013
Glucose oxidase "wired" with potassium ferricyanide polypyrrole films UPB Scientific Bulletin Series B Chemistry and Materials Science, 2012
Systems based on dendrimers and antitumoral drug synthesized by non-covalent method the influence of dendrimers generation Materiale Plastice, 2011
Influence of the solid-liquid adhesion on the self-assembling properties of colloidal particles Photonic Crystals Fabrication Band Structure and Applications, 2011
Influence of the solid-liquid adhesion on the self-assembling properties of colloidal particles Advances in Chemistry Research, 2011
Investigating the impact of polyacrylonitrile grade on the electrochemical performance of carbonized PAN/MXene hybrid hollow fiber-based supercapacitors CC Muhuwa, SRE Mohamed, AEP Mendoza, P Wuenscher, A Wittmar, ... Journal of Power Sources 678, 240047 , 2026 2026
From Deposition Stress to Surface Reactivity: Strain-Dependent Hydrogen Evolution on Sputtered Platinum Thin Films S Baha, AEP Mendoza, LH Morais, A Kostka, S Shukla, E Suhr, A Oliveira, ... arXiv preprint arXiv:2605.06348 , 2026 2026
Epitaxial Films as Model Platform for Understanding Compositionally Complex Electrocatalysts S Kar, AE Perez-Mendoza, H Xiu, M Joo, KV Yusenko, U Hagemann, ... arXiv preprint arXiv:2602.20784 , 2026 2026
Impact of the Gas Atmosphere at the Triple Boundary Phase on the Measured Oxygen Evolution Reaction Activity of Ni 2 B/Ni 3 B Electrocatalysts L Madayan‐Banatheth, AE Perez‐Mendoza, U Burkhardt, I Antonyshyn, ... Small Methods 10 (3), e01880 , 2026 2026
Quantification of Gaseous Products Evolved at Industrially Relevant Current Densities During CO 2 Electroreduction and Water Electrolysis Using Online Gas … R Ribeiro Lima Machado, BN Jaato, TC Schmidt, I Sanjuán, ... Advanced Energy and Sustainability Research 7 (2), e202500290 , 2026 2026
Structural and Electrocatalytic Properties of La-Co-Ni Oxide Thin Films P Marx, S Shukla, AEP Mendoza, F Lourens, C Andronescu, A Ludwig Thin Solid Films, 140880 , 2026 2026
From half-cells to full-cells: across-scale comparative evaluation of lanthanum-based perovskites as high-performance anode materials for the oxygen evolution reaction B Toplak, L Müller, AR Khan, A Olean-Oliveira, KY Muhammad, W Feng, ... Chemical Engineering Journal, 173316 , 2026 2026 Citations: 2
Impact of Structural Heterogeneities in Hierarchically Grown Microribbons on 2D WS 2 Monolayer on the Measured Local Hydrogen Evolution Activity on Au Substrate LA Adofo, AE Pérez Mendoza, M Joo, L Madayan‐Banatheth, ... Small, e10517 , 2026 2026
Laser‐Induced Iron Doping of Spinel Thin Film Electrocatalyst: Impact of Pulsed Laser Processing on Surface Cobalt Oxide Doping and Oxygen Evolution Reaction Activity D Schellenburg, S Shukla, AEP Mendoza, LM Banatheth, CH Scharf, ... ChemCatChem 18 (2), e01233 , 2026 2026
Crafting KOH Electrolyte for AEM Water Electrolysis: From Faucet to Fuel O Koriem, P Perroni, C Andronescu, S Panglisch Journal of Physics: Conference Series 3143 (1), 012015 , 2025 2025
Laser-Induced Iron Doping of Spinel Thin Film Electrocatalyst: Impact of Pulsed Laser Processing on Surface Cobalt Oxide Doping and Oxygen Evolution Reaction Activity S Barcikowski, D Schellenburg, S Shukla, AP Mendoza, LM Banatheth, ... ChemRxiv 2025 (1105) , 2025 2025
Glycerol Electrooxidation at Structured Nickel Electrodes and the Effect of Geometry on the Selectivity of Product AR Khan, B Kumari, J Wegner, F Pedrini, LA Adofo, A Olean‐Oliveira, ... ChemElectroChem 12 (17), e202500175 , 2025 2025 Citations: 3
Ni-Co-O anodes for the alkaline oxygen evolution reaction: Multistage electrode optimization and plasma-assisted activity enhancement enabled by a coherent workflow V Vinayakumar, T Wagner, C Marcks, J Johny, G Wartner, A Lim, ... Chemical Engineering Journal, 167169 , 2025 2025 Citations: 7
Deciphering the Electrochemical Activity and Selectivity of Earth‐Abundant Transition Metal‐Based Catalysts for the Alcohol Electrooxidation—Current Status M Braun, C Andronescu ChemCatChem 17 (8), e202402013 , 2025 2025 Citations: 9
Surface Reconstruction Induced by Preconditioning in Different Electrolytes Impacts Electrooxidation of Solketal on Multi‐Metal‐Based Catalysts J Zhang, B Kumari, T Quast, S Cychy, I Sanjuán, M Muhler, W Schuhmann, ... Advanced Functional Materials 35 (16), 2419911 , 2025 2025 Citations: 2
Chemical Reaction Pathways during Laser Fragmentation of Metallic Microparticles in Organic Solvents T Fromme, R Müller, L Krenz, LK Tintrop, I Sanjuán, TC Schmidt, ... The Journal of Physical Chemistry C 129 (6), 2953-2965 , 2025 2025 Citations: 6
Intrinsically Conductive and Cu‐Functionalized Polymer‐Composite Membranes as Gas Diffusion Electrodes for CO 2 Electroreduction I Sanjuán, V Kumbhar, O Prymak, M Ulbricht, C Andronescu, L Fischer ChemSusChem 18 (2), e202401228 , 2025 2025 Citations: 7
Determining materials for energy conversion across scales: The alkaline oxygen evolution reaction P Gerschel, S Angel, M Hammad, A Olean‐Oliveira, B Toplak, V Chanda, ... Carbon Energy 6 (12), e608 , 2024 2024 Citations: 15
Investigating Anode Structural Characteristics with Multistage Data Quantification: Influence of Extrinsic Properties of Anodes for Oxidation Evolution Reaction in Alkaline … A Jain, V Vinayakumar, A Olean-Oliveira, C Marcks, M Chatwani, ... Electrochemical Society Meeting Abstracts prime2024, 2197-2197 , 2024 2024
Reproducible Superinsulation Materials: Organosilica-Based Hybrid Aerogels with Flexibility Control M Geyer, F Leven, J Limberg, C Andronescu, R Ostermann Gels 10 (11), 692 , 2024 2024 Citations: 1
MOST CITED SCHOLAR PUBLICATIONS
Electrocatalysis as the nexus for sustainable renewable energy: the gordian knot of activity, stability, and selectivity J Masa, C Andronescu, W Schuhmann Angewandte Chemie International Edition 59 (36), 15298-15312 , 2020 2020 Citations: 291
Cascade reactions in nanozymes: Spatially separated active sites inside Ag-Core–Porous-Cu-shell nanoparticles for multistep carbon dioxide reduction to higher organic molecules PB O’Mara, P Wilde, TM Benedetti, C Andronescu, S Cheong, JJ Gooding, ... Journal of the American Chemical Society 141 (36), 14093-14097 , 2019 2019 Citations: 224
Influence of the Fe:Ni Ratio and Reaction Temperature on the Efficiency of (FexNi1–x)9S8 Electrocatalysts Applied in the Hydrogen Evolution Reaction S Piontek, C Andronescu, A Zaichenko, B Konkena, K Puring, B Marler, ... ACS Catalysis 8 (2), 987-966 , 2018 2018 Citations: 187
Sericin covalent immobilization onto cellulose acetate membrane for biomedical applications SI Voicu, RM Condruz, V Mitran, A Cimpean, F Miculescu, C Andronescu, ... ACS Sustainable Chemistry & Engineering 4 (3), 1765-1774 , 2016 2016 Citations: 187
Low overpotential water splitting using cobalt–cobalt phosphide nanoparticles supported on nickel foam J Masa, S Barwe, C Andronescu, I Sinev, A Ruff, K Jayaramulu, ... ACS Energy Letters 1 (6), 1192-1198 , 2016 2016 Citations: 174
Powder catalyst fixation for post‐electrolysis structural characterization of NiFe layered double hydroxide based oxygen evolution reaction electrocatalysts C Andronescu, S Barwe, E Ventosa, J Masa, E Vasile, B Konkena, ... Angewandte Chemie International Edition 56 (37), 11258-11262 , 2017 2017 Citations: 167
Operando scanning electrochemical probe microscopy during electrocatalysis C Santana Santos, BN Jaato, I Sanjuan, W Schuhmann, C Andronescu Chemical Reviews 123 (8), 4972-5019 , 2023 2023 Citations: 156
MOFs for electrocatalysis: from serendipity to design strategies HB Aiyappa, J Masa, C Andronescu, M Muhler, RA Fischer, ... Small Methods 3 (8), 1800415 , 2019 2019 Citations: 142
Electrocatalytic conversion of glycerol to oxalate on Ni oxide nanoparticles-modified oxidized multiwalled carbon nanotubes DM Morales, D Jambrec, MA Kazakova, M Braun, N Sikdar, A Koul, ... ACS Catalysis 12 (2), 982-992 , 2022 2022 Citations: 139
Local surface structure and composition control the hydrogen evolution reaction on iron nickel sulfides C Bentley, C Andronescu, M Smialkowski, M Kang, T Tarnev, B Marler, ... Angewandte Chemie , 2018 2018 Citations: 136
B‐Cu‐Zn Gas Diffusion Electrodes for CO 2 Electroreduction to C 2+ Products at High Current Densities Y Song, JRC Junqueira, N Sikdar, D Öhl, S Dieckhöfer, T Quast, S Seisel, ... Angewandte Chemie International Edition 60 (16), 9135-9141 , 2021 2021 Citations: 132
Oxygen evolution electrocatalysis of a single MOF‐derived composite nanoparticle on the tip of a nanoelectrode HB Aiyappa, P Wilde, T Quast, J Masa, C Andronescu, YT Chen, ... Angewandte Chemie International Edition 58 (26), 8927-8931 , 2019 2019 Citations: 119
A Metal–Organic Framework derived Cu x O y C z Catalyst for Electrochemical CO 2 Reduction and Impact of Local pH Change N Sikdar, JRC Junqueira, S Dieckhöfer, T Quast, M Braun, Y Song, ... Angewandte Chemie International Edition 60 (43), 23427-23434 , 2021 2021 Citations: 117
Scanning Electrochemical Cell Microscopy Investigation of Single ZIF‐Derived Nanocomposite Particles as Electrocatalysts for Oxygen Evolution in Alkaline Media T Tarnev, HB Aiyappa, A Botz, T Erichsen, A Ernst, C Andronescu, ... Angewandte Chemie International Edition 58 (40), 14265-14269 , 2019 2019 Citations: 111
Cellulose acetate/layered double hydroxide adsorptive membranes for efficient removal of pharmaceutical environmental contaminants MD Raicopol, C Andronescu, SI Voicu, E Vasile, AM Pandele Carbohydrate polymers 214, 204-212 , 2019 2019 Citations: 111
Single Particle Nanoelectrochemistry Reveals the Catalytic Oxygen Evolution Reaction Activity of Co 3 O 4 Nanocubes T Quast, S Varhade, S Saddeler, YT Chen, C Andronescu, S Schulz, ... Angewandte Chemie International Edition 60 (43), 23444-23450 , 2021 2021 Citations: 105
Electrocatalytic nanoparticles that mimic the three-dimensional geometric architecture of enzymes: Nanozymes TM Benedetti, C Andronescu, S Cheong, P Wilde, J Wordsworth, M Kientz, ... Journal of the American Chemical Society 140 (41), 13449-13455 , 2018 2018 Citations: 104
The efficiency of Co-based single-wall carbon nanotubes (SWNTs) as an AW/EP additive for mineral base oils DL Cursaru, C Andronescu, C Pirvu, R Ripeanu Wear 290, 133-139 , 2012 2012 Citations: 102
Prospects of value‐added chemicals and hydrogen via electrolysis B Garlyyev, S Xue, J Fichtner, AS Bandarenka, C Andronescu ChemSusChem 13 (10), 2513-2521 , 2020 2020 Citations: 101
Accelerating CO 2 electrochemical conversion towards industrial implementation D Segets, C Andronescu, UP Apfel nature communications 14 (1), 7950 , 2023 2023 Citations: 97
