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Mario Mitov Georgi Hristov Elitsa Hristova Rashko Rashkov Marina Arnaudova Andreas Zielonka 《Environmental Chemistry Letters》2009,7(2):167-173
The complex performance of newly synthesized CoNiMnB electrodeposits in base-stabilized sodium borohydride solutions was examined.
The rate of hydrogen generation due to borohydride hydrolysis was determined at different temperatures. Activation energy
of approximately 33 kJ/mol was estimated, which is lower than the values reported for other catalysts. At electrochemical
conditions, there is a competition between borohydride hydrolysis and electrooxidation reactions. The electrooxidation of
borohydride takes place with low overpotentials at relatively high current densities. The long-term discharge at galvanostatic
conditions as well as possibilities for partial storage of generated hydrogen indicates potentials for application of studied
electrodeposits as anode material in direct borohydride fuel cells (DBFC). 相似文献
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Mario Mitov Elitsa Hristova Georgi Hristov Rashko Rashkov Marina Arnaudova Alexander Popov 《Environmental Chemistry Letters》2009,7(3):249-253
NiW systems are known as one of the best catalysts for various desulfurization processes. In this study, we examined catalytic
properties of NiW electrodeposits, produced from two different electrolytes, towards sulfide ion oxidation in alkaline solution.
Despite the big difference in morphology and structure of both materials, they exhibit almost the same catalytic activity
for the examined reaction. A possible explanation of this experimental fact is that the overall reaction is controlled by
the transport of oxygen through the catalyst samples. 相似文献
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Kirkfeldt Trine Skovgaard Hansen Anne Merrild Olesen Pernille Mortensen Lucia Hristova Kameliya Welsch Alexander 《Regional Environmental Change》2017,17(3):725-737
Regional Environmental Change - The Arctic Region is characterised by vulnerable ecosystems and residing indigenous people, dependent on nature for subsistence fishing and hunting. The Arctic also... 相似文献
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To duckweeds (Landoltia punctata), nanoparticulate copper oxide is more inhibitory than the soluble copper in the bulk solution 总被引:1,自引:0,他引:1
Shi J Abid AD Kennedy IM Hristova KR Silk WK 《Environmental pollution (Barking, Essex : 1987)》2011,159(5):1277-1282
CuO nanoparticles (CuO-NP) were synthesized in a hydrogen diffusion flame. Particle size and morphology were characterized using scanning mobility particle sizing, Brunauer-Emmett-Teller analysis, dynamic light scattering, and transmission electron microscopy. The solubility of CuO-NP varied with both pH and presence of other ions. CuO-NP and comparable doses of soluble Cu were applied to duckweeds, Landoltia punctata. Growth was inhibited 50% by either 0.6 mg L−1 soluble copper or by 1.0 mg L−1 CuO-NP that released only 0.16 mg L−1 soluble Cu into growth medium. A significant decrease of chlorophyll was observed in plants stressed by 1.0 mg L−1 CuO-NP, but not in the comparable 0.2 mg L−1 soluble Cu treatment. The Cu content of fronds exposed to CuO-NP is four times higher than in fronds exposed to an equivalent dose of soluble copper, and this is enough to explain the inhibitory effects on growth and chlorophyll content. 相似文献
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