882 research outputs found
Data for "Methamphetamine Removal from Aquatic Environments by Magnetic Microrobots with Cyclodextrin Chiral Recognition Elements"
No full textSurfactant capsules propel interfacial oil droplets: an environmental cleanup strategy
No full textInvited for this month’s cover is the group of Prof. Martin Pumera from Nanyang Technological University, Singapore. The cover picture shows pristine underwater coral. This image symbolizes the beauty of a clean environment (coral reef in Indonesia), while the inset outlines the mechanism of the motion of the self-propelled cleaning capsule. Read the full text of the article at 10.1002/cplu.20130001
Editorial [Hot Topic: Advanced Materials and Nanotechnology for DNA Detection (Guest Editor: Martin Pumera)]
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2H → 1T phase engineering of layered tantalum disulphides in electrocatalysis: oxygen reduction reaction
No full textTremendous attention is paid to renewable sources of energy. Transition metal dichalcogenides (TMDs) are intensively studied for their promising catalytic activities in hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR). In this fundamental work, we explore the catalytic properties of TMDs family members: 2H TaS2 and 1T TaS2. Our findings reveal that both polytypes exhibit poor HER performance which is even more pronounced when subjected to electrochemical treatment with reduction/oxidation. Our experimental data show that 1T TaS2 has a lower overpotential at a current density of -10 mA.cm-1, despite our theoretical density functional theory (DFT) calculations indicating that more favorable free energy of hydrogen adsorption should make perfect 2H TaS2 a better HER catalyst. By a thorough characterization, it is shown that the higher conductivity of 1T TaS2 and a slightly higher surface oxidation of 2H TaS2 explains this discrepancy. Moreover the changes in catalytic activity after electrochemical treatment are addressed here. For the oxygen reduction reaction (ORR) the electrochemical treatment leads to an improvement of catalytic properties. With onset potentials similar to that of Pt/C catalyst, TaS2 is found to be an efficient catalyst for oxygen reduction, rather than for proton reduction, in opposite to the behaviour of group VIB layered TMDs
Raw data for MSCA grantno. 99878 LoCatSpot
No full textVersion 2: This Data set contains the raw data of the article:
Catalyst Formation and In Operando Monitoring of the Electrocatalytic Activity in Flow Reactors
Christian Iffelsberger, Stefan Wert, Frank-Michael Matysi, and Martin Pumera*
ACS Appl. Mater. Interfaces 2021, 13, 30, 35777–35784
https://doi.org/10.1021/acsami.1c09127
Related to the Project MSCA: 99878 LoCatSpo
Small scale motors : fabrication, characterizations, motions studies and applications
No full textIn this thesis, the author describes the research work done during the four years Ph.D. study, focusing on the fabrication, motion study and possible applications of small motors, ranging from millimeter scale polymer motors to microscale and nanoscale catalytic motors. The millimeter scale capsule motors were made from polysulfone, and a series of studies were carried out on such motors, including the factors influencing the motion, motion manipulation with magnet, cooperative behaviors, and induced motion of oil droplets. Moreover, running of such motors in water/oil interface and the maze channel was studied. Additionally, the enhanced diffusion of pollutants in the natural environment was also investigated.
The studies on the microscale and nanoscale catalytic motors were also carried out. Fabrication and characterizations of the tubular motors were realized, and magnetization was achieved for both nanomotors and micromotors. Upon magnetization, such microtubes can pick up the paramagnetic cargoes for possible delivery. Moreover, the effects of the running medium on the motion of the micromotors were also investigated.DOCTOR OF PHILOSOPHY (SPMS
Electrochemical properties of double wall carbon nanotube electrodes
No full textAbstractElectrochemical properties of double wall carbon nanotubes (DWNT) were assessed and compared to their single wall (SWNT) counterparts. The double and single wall carbon nanotube materials were characterized by Raman spectroscopy, scanning and transmission electron microscopy and electrochemistry. The electrochemical behavior of DWNT film electrodes was characterized by using cyclic voltammetry of ferricyanide and NADH. It is shown that while both DWNT and SWNT were significantly functionalized with oxygen containing groups, double wall carbon nanotube film electrodes show a fast electron transfer and substantial decrease of overpotential of NADH when compared to the same way treated single wall carbon nanotubes.</p
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