The Experts below are selected from a list of 36 Experts worldwide ranked by ideXlab platform
Kaido Tammeveski - One of the best experts on this subject based on the ideXlab platform.
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transition metal nitrogen co doped carbide Derived Carbon catalysts for oxygen reduction reaction in alkaline direct methanol fuel cell
Applied Catalysis B-environmental, 2017Co-Authors: Sande Ratso, Maike Käärik, Iva Kruusenberg, Mati Kook, Rando Saa, Petri Kannine, Tanja Kallio, Jaa Leis, Kaido TammeveskiAbstract:Abstract In this work, we demonstrate the electrocatalytic properties of cobalt- and iron-containing nitrogen-doped carbide-Derived Carbon Materials in the oxygen reduction reaction (ORR) and utilise these as cathode catalysts in an alkaline direct methanol fuel cell. The carbide-Derived Carbon Material is produced by chlorination of titanium carbide, which is then pyrolysed in the presence of dicyandiamide and either a cobalt or iron salt. The electrocatalytic activity towards the ORR and stability of the catalyst Materials is tested in 0.1 M KOH solution employing the rotating disk electrode (RDE) method and compared to a commercial Pt/C catalyst. The elemental composition in the bulk of the Materials is studied using energy dispersive X-ray spectroscopy and on the surface by X-ray photoelectron spectroscopy. Scanning electron microscopy is used to investigate the surface morphology of the resulting catalysts. The performance of the catalysts is also compared in alkaline direct methanol fuel cell. The catalysts’ performance is comparable to that of Pt/C in both RDE and fuel cell measurements and rather peculiar morphologies are observed by the growth of Carbon nanotubes during pyrolysis. Overall, these novel catalysts show great potential for application in alkaline direct methanol fuel cells.
Xianjun Wei - One of the best experts on this subject based on the ideXlab platform.
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a versatile biomass Derived Carbon Material for oxygen reduction reaction supercapacitors and oil water separation
Nano Energy, 2017Co-Authors: Shuyan Gao, Xianjun WeiAbstract:Abstract Directly pyrolyzing biowastes has attracted intensive interest, probably because this economical and facile method provides an efficient and versatile platform for synthesizing functional Carbons. This study describes the synthesis of different functional Carbons from poplar catkins via different processes for multi-purpose applications. Nitrogen and oxygen dual-doped Carbon (NODC-800) Derived from catkins delivers superior electrochemical characteristics as oxygen reduction reaction (ORR) catalyst in alkaline fuel cell to that of commercial Pt/C in terms of catalytic activity, stability, resistance to methanol cross-over and CO poisoning. In addition, NODC-800 exhibits a high capacity (~251 F g−1 at 0.5 A g−1) with nearly 100% retention rate after 1000 cycles as supercapacitors electrodes. An oleophylic Carbon aerogel Derived from catkins is proven to be superoleophilic and porous enough to “wet” with oils and organic liquids and repel water completely to achieve oil/water separation. This work is a successful case to take full advantage of raw Materials from nature via multiple technologies to achieve energy sustainable development and protect environmental from oils and organic solvents spill.
Alvo Aabloo - One of the best experts on this subject based on the ideXlab platform.
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Nanoporous Carbide-Derived Carbon Material-Based Linear Actuators
Materials, 2009Co-Authors: Mati Arulepp, Jaan Leis, Andres Punning, Urmas Johanson, Viljar Palmre, Alvo AablooAbstract:Abstract: Devices using electroactive polymer-supported Carbon Material can be exploited as alternatives to conventional electromechanical actuators in applications where electromechanical actuators have some serious deficiencies. One of the numerous examples is precise microactuators. In this paper, we show for first time the dilatometric effect in nanocomposite Material actuators containing carbide-Derived Carbon (CDC) and polytetrafluoroetylene polymer (PTFE). Transducers based on high surface area carbide-Derived Carbon electrode Materials are suitable for short range displacement applications, because of the proportional actuation response to the charge inserted, and high Coulombic efficiency due to the EDL capacitance. The Material is capable of developing stresses in the range of tens of N cm -2 . The area of an actuator can be dozens of cm 2 , which means that forces above 100 N are achievable. The actuation mechanism is based on the interactions between the high-surface Carbon and the ions of the electrolyte. Electrochemical evaluations of the four different actuators with linear (longitudinal) action response are described. The actuator electrodes were made from two types of nanoporous TiC-Derived Carbons with surface area (S
Sande Ratso - One of the best experts on this subject based on the ideXlab platform.
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transition metal nitrogen co doped carbide Derived Carbon catalysts for oxygen reduction reaction in alkaline direct methanol fuel cell
Applied Catalysis B-environmental, 2017Co-Authors: Sande Ratso, Maike Käärik, Iva Kruusenberg, Mati Kook, Rando Saa, Petri Kannine, Tanja Kallio, Jaa Leis, Kaido TammeveskiAbstract:Abstract In this work, we demonstrate the electrocatalytic properties of cobalt- and iron-containing nitrogen-doped carbide-Derived Carbon Materials in the oxygen reduction reaction (ORR) and utilise these as cathode catalysts in an alkaline direct methanol fuel cell. The carbide-Derived Carbon Material is produced by chlorination of titanium carbide, which is then pyrolysed in the presence of dicyandiamide and either a cobalt or iron salt. The electrocatalytic activity towards the ORR and stability of the catalyst Materials is tested in 0.1 M KOH solution employing the rotating disk electrode (RDE) method and compared to a commercial Pt/C catalyst. The elemental composition in the bulk of the Materials is studied using energy dispersive X-ray spectroscopy and on the surface by X-ray photoelectron spectroscopy. Scanning electron microscopy is used to investigate the surface morphology of the resulting catalysts. The performance of the catalysts is also compared in alkaline direct methanol fuel cell. The catalysts’ performance is comparable to that of Pt/C in both RDE and fuel cell measurements and rather peculiar morphologies are observed by the growth of Carbon nanotubes during pyrolysis. Overall, these novel catalysts show great potential for application in alkaline direct methanol fuel cells.
Shuyan Gao - One of the best experts on this subject based on the ideXlab platform.
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a versatile biomass Derived Carbon Material for oxygen reduction reaction supercapacitors and oil water separation
Nano Energy, 2017Co-Authors: Shuyan Gao, Xianjun WeiAbstract:Abstract Directly pyrolyzing biowastes has attracted intensive interest, probably because this economical and facile method provides an efficient and versatile platform for synthesizing functional Carbons. This study describes the synthesis of different functional Carbons from poplar catkins via different processes for multi-purpose applications. Nitrogen and oxygen dual-doped Carbon (NODC-800) Derived from catkins delivers superior electrochemical characteristics as oxygen reduction reaction (ORR) catalyst in alkaline fuel cell to that of commercial Pt/C in terms of catalytic activity, stability, resistance to methanol cross-over and CO poisoning. In addition, NODC-800 exhibits a high capacity (~251 F g−1 at 0.5 A g−1) with nearly 100% retention rate after 1000 cycles as supercapacitors electrodes. An oleophylic Carbon aerogel Derived from catkins is proven to be superoleophilic and porous enough to “wet” with oils and organic liquids and repel water completely to achieve oil/water separation. This work is a successful case to take full advantage of raw Materials from nature via multiple technologies to achieve energy sustainable development and protect environmental from oils and organic solvents spill.