A5035321019- Electrochemical Analysis and Applications
- Electrocatalysts for Energy Conversion
- Electrochemical sensors and biosensors
- Analytical Chemistry and Sensors
- Advanced battery technologies research
- Conducting polymers and applications
- Fuel Cells and Related Materials
- Advanced biosensing and bioanalysis techniques
- Force Microscopy Techniques and Applications
- Advancements in Battery Materials
- CO2 Reduction Techniques and Catalysts
- Molecular Junctions and Nanostructures
- Advanced Photocatalysis Techniques
- Photosynthetic Processes and Mechanisms
- Supercapacitor Materials and Fabrication
- Catalytic Processes in Materials Science
- Advanced Battery Materials and Technologies
- Microbial Fuel Cells and Bioremediation
- Advanced Battery Technologies Research
- Copper-based nanomaterials and applications
- Metalloenzymes and iron-sulfur proteins
- Photoreceptor and optogenetics research
- Advanced Chemical Sensor Technologies
- Biosensors and Analytical Detection
- Microfluidic and Capillary Electrophoresis Applications
Ruhr University Bochum
2016-2025
University Hospitals of the Ruhr-University of Bochum
2016-2022
Robert Bosch (Germany)
2019-2022
Faculty (United Kingdom)
2016-2021
ORCID
2021
Laboratoire de Chimie Moléculaire et Thioorganique
2019-2021
SLAC National Accelerator Laboratory
2020
Stanford Synchrotron Radiation Lightsource
2020
Clinical Research Organization
2020
Institut für Seeverkehrswirtschaft und Logistik
2019
Abstract Efficient reversible oxygen electrodes for both the reduction reaction (ORR) and evolution (OER) are vitally important various energy conversion devices, such as regenerative fuel cells metal–air batteries. However, realization of is impeded by insufficient activity instability electrocatalysts water splitting reduction. We report highly active bifunctional comprising core–shell Co@Co 3 O 4 nanoparticles embedded in CNT‐grafted N‐doped carbon‐polyhedra obtained pyrolysis cobalt...
A good heterogeneous catalyst for a given chemical reaction very often has only one specific type of surface site that is catalytically active. Widespread methodologies such as Sabatier-type activity plots determine optimal adsorption energies to maximize catalytic activity, but these are difficult use guidelines devise new catalysts. We introduce "coordination-activity plots" predict the geometric structure active sites. The method illustrated on oxygen reduction catalyzed by platinum....
It is demonstrated that amorphous cobalt boride (Co 2 B) prepared by the chemical reduction of CoCl using NaBH 4 an exceptionally efficient electrocatalyst for oxygen evolution reaction (OER) in alkaline electrolytes and simultaneously active catalyzing hydrogen (HER). The catalyst achieves a current density 10 mA cm −2 at 1.61 V on inert support 1.59 when impregnated with nitrogen‐doped graphene. Stable performance maintained least 60 h. optimized catalyst, Co B annealed 500 °C B‐500)...
The notion of metal-free catalysts is used to refer carbon materials modified with nonmetallic elements. However, some claimed are prepared using metal-containing precursors. It highly contested that metal residues in nitrogen-doped (NC) play a crucial role the oxygen reduction reaction (ORR). In an attempt reconcile divergent views, definition for truly proposed and differences between NC M-Nx /C discussed. Metal impurities at levels usually undetectable by techniques such as XPS, XRD, EDX...
Nitrogen-containing carbon nanotubes (NCNTs) were prepared via pyrolysis of acetonitrile over cobalt catalysts at different temperatures to control the nitrogen content. The changes in chemical and structural properties undoped CNTs NCNTs investigated using high-resolution X-ray photoelectron Raman spectroscopy. 550 °C had a higher amount pyridinic groups edge plane exposure than ones 750 °C. thermal stability transformation these functional was studied deconvoluted XP N 1s spectra. show...
Electrocatalytic recycling of waste nitrate (NO3-) to valuable ammonia (NH3) at ambient conditions is a green and appealing alternative the Haber-Bosch process. However, reaction requires multi-step electron proton transfer, making it grand challenge drive high-rate NH3 synthesis in an energy-efficient way. Herein, we present design concept tandem catalysts, which involves coupling intermediate phases different transition metals, existing low applied overpotentials, as cooperative active...
Reversible interconversion of water into H2 and O2, the recombination O2 to H2O thereby harnessing energy reaction provides a completely green cycle for sustainable conversion storage. The realization this goal is however hampered by lack efficient catalysts splitting oxygen reduction. We report exceptionally active bifunctional electrodes comprising Mn3O4 Co3O4 nanoparticles embedded in nitrogen-doped carbon, obtained selective pyrolysis subsequent mild calcination manganese cobalt N4...
The overriding obstacle to mass production of hydrogen from water as the premium fuel for powering our planet is frustratingly slow kinetics oxygen evolution reaction (OER). Additionally, inadequate understanding key barriers OER a hindrance insightful design advanced catalysts. This study presents ultrathin amorphous high‐surface area nickel boride (Ni x B) nanosheets low‐cost, very efficient and stable catalyst electrochemical splitting. affords 10 mA cm −2 at 0.38 V overpotential during...
The electrochemical oxidation of the biorefinery product 5-(hydroxymethyl)furfural (HMF) to 2,5-furandicarboxylic acid (FDCA), an important platform chemical for polymer industry, is receiving increasing interest. FDCA-based polymers such as polyethylene 2,5-furandicarboxylate (PEF) are sustainable candidates replacing terephthalate (PET). Herein, we report highly efficient electrocatalytic HMF FDCA, using Ni foam modified with high-surface-area nickel boride (Nix B) electrode. Constant...
Abstract In the endeavor of discovering new noble metal–free electrocatalysts for oxygen reduction reaction, multinary transition metal nanoparticle libraries are investigated. The complexity such multiple principal element alloys provides access to a large variety different elemental compositions, each with potentially unique properties. strategy efficient identification novel electrocatalytically active systems comprises combinatorial co‐sputtering into an ionic liquid followed by...
The notorious instability of non-precious-metal catalysts for oxygen reduction and evolution is by far the single unresolved impediment their practical applications. We have designed highly stable active bifunctional reversible electrodes oxidative thermal scission, where we concurrently rupture nitrogen-doped carbon nanotubes oxidize Co Mn nanoparticles buried inside them to form spinel Mn-Co oxide partially embedded in nanotubes. Impressively high dual activity achieved using these...
Abstract Discovering precious metal‐free electrocatalysts exhibiting high activity and stability toward both the oxygen reduction (ORR) evolution (OER) reactions remains one of main challenges for development reversible electrodes in rechargeable metal–air batteries electrolyzer/fuel cell systems. Herein, a highly active OER catalyst, Fe 0.3 Ni 0.7 O X supported on oxygen‐functionalized multi‐walled carbon nanotubes, is substantially activated into bifunctional ORR/OER catalyst by means...
We report metallic NiPS3@NiOOH core–shell heterostructures as an efficient and durable electrocatalyst for the oxygen evolution reaction, exhibiting a low onset potential of 1.48 V (vs RHE) stable performance over 160 h. The atomically thin NiPS3 nanosheets are obtained by exfoliation bulk in presence ionic surfactant. OER mechanism was studied combination SECM, situ Raman spectroscopy, SEM, XPS measurements, which enabled direct observation formation heterostructure at electrode interface....
Engineering of controlled hybrid nanocomposites creates one the most exciting applications in fields energy materials and environmental science. The rational design situ synthesis hierarchical porous nanocomposite sheets nitrogen‐doped graphene oxide (NGO) nickel sulfide (Ni 7 S 6 ) derived from a well‐known nickel‐based metal‐organic framework (NiMOF‐74) using thiourea as sulfur source are reported here. nanoporous NGO/MOF composite is prepared through solvothermal process which Ni(II)...
The measurement of key molecules in individual cells with minimal disruption to the biological milieu is next frontier single-cell analyses. Nanoscale devices are ideal analytical tools because their small size and potential for high spatial temporal resolution recordings. Here, we report fabrication disk-shaped carbon nanoelectrodes whose radius can be precisely tuned within range 5-200 nm. functionalization nanoelectrode platinum allowed monitoring oxygen consumption outside inside a brain...
Complex solid solution (CSS) nanoparticles were recently discovered as efficient electrocatalysts for a variety of reactions. As one many advantages, they exhibit the potential to replace noble-metal catalysts with multinary combinations transition metals because offer formation new unique and tailorable active sites multiple elements located next each other. This Perspective reports on current state challenges (combinatorial) synthesis advanced electron microscopy characterization...
Carbon corrosion at high anodic potentials is a major source of instability, especially in acidic electrolytes and impairs the long-term functionality electrodes. In-depth investigation carbon alkaline environment by means differential electrochemical mass spectrometry (DEMS) prevented conversion CO2 into CO32- . We report adaptation DEMS system for online detection as product electrolytes. A new cell design allows situ acidification electrolyte to release initially dissolved front membrane...