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RISS 인기검색어
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- 저자 : Adamaki, V. (검색결과 2 건)
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Chandrasekaran, Sundaram,Kim, Eui Jung,Chung, Jin Suk,Bowen, Chris R.,Rajagopalan, Balasubramaniyan,Adamaki, Vaia,Misra, R. D. K.,Hur, Seung Hyun The Royal Society of Chemistry 2016 Journal of Materials Chemistry A Vol.4 No.34
<P>The advances in cost effective, highly active and stable electrocatalysts for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) remain the major issues for the commercialization of metal air-batteries and alkaline fuel cells. In this aspect, a facile hydrothermal route was developed to prepare nonprecious metal electrocatalysts including pristine MoO3rods, nanospheres, and their hybrids with reduced graphene oxide (rGO). This is the first report of the use of rGO coupled with hexagonal MoO3nanocrystals that act as both ORR and OER catalysts. The rGO-MoO3sphere hybrid catalyst exhibited excellent catalytic activity toward both the ORR and OER compared to pristine MoO3rods, MoO3spheres and rGO-MoO3rods. In addition, the rGO-MoO3nanosphere hybrid exhibited excellent catalytic activity, long-term durability, and CO tolerance compared to a high quality commercial Pt/C catalyst. This makes the GMS hybrid composite a highly promising candidate for high-performance non-precious metal-based bi-functional electrocatalysts with low cost and high efficiency for electrochemical energy conversion. The enhanced activity of the rGO-MoO3nanosphere hybrid is due mainly to the enhanced structural openness in the tunnel structure of the hexagonal MoO3when it is coupled with rGO.</P>
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Chandrasekaran, S.,Kim, E.J.,Chung, J.S.,Yoo, I.K.,Senthilkumar, V.,Kim, Y.S.,Bowen, C.R.,Adamaki, V.,Hyun Hur, S. Elsevier 2017 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.309 No.-
This is the first demonstration of four distinct types of Lead Magnesium Titanate (PMT) perovskites including spheres, flakes, hierarchical flower and thin microbelt shapes that were finely tuned via facile solution method to develop cost effective and high performance photoanode materials for water splitting. The influence of solvent effects during structural tuning, purity, morphology, optical absorption, structural phase transition and stoichiometric formation of the prepared Lead Magnesium Titanate perovskites has been discussed in detail. A remarkable observation is that the thin microbelts structured PMT perovskite (PMTT) exhibited an excellent water splitting performance and it is more sensitive to the illuminated visible light. Owing to the unique structural features, the photoconversion efficiency value of PMTT perovskite is ~3.9, 3.54, 2.85 and 1.52 times higher than those of other prepared PMT perovskites including pristine PbTiO<SUB>3</SUB>. The excellent water splitting performance of PMTT (thin microbelts) may be ascribed to the remarkable structural features that include a large surface area, high optical absorbance, more active sites and high interface area of the microbelts, which provide large contact areas between the electrolyte and highly active materials for electrolyte diffusion and a rapid route for charge transfer with minimal diffusion resistance. In addition, each thin microbelt is directly in contact with the Ni foam substrate, which can also shorten the diffusion path for the electrons. The demonstrated approach paves the way for low-cost and high-throughput production of next generation, high performance and highly active water splitting perovskite photocatalysts.
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