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47 results on '"Kucernak, A. R. J."'

1. Phase-dependent growth of Pt on MoS2 for highly efficient H2 evolution

Author

Shi, Zhenyu, Zhang, Xiao, Lin, Xiaoqian, Liu, Guigao, Ling, Chongyi, Xi, Shibo, Chen, Bo, Ge, Yiyao, Tan, Chaoliang, Lai, Zhuangchai, Huang, Zhiqi, Ruan, Xinyang, Zhai, Li, Li, Lujiang, Li, Zijian, Wang, Xixi, Nam, Gwang-Hyeon, Liu, Jiawei, He, Qiyuan, Guan, Zhiqiang, Wang, Jinlan, Lee, Chun-Sing, Kucernak, Anthony R. J., and Zhang, Hua

Published
2023
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4. Multifunctional design, feasibility and requirements for structural power composites in future electric air taxis

Author

Ishfaq, A., Nguyen, S. N., Greenhalgh, E. S., Shaffer, M. S. P., Kucernak, A. R. J., Asp, L. E., Zenkert, Dan, Linde, P., Ishfaq, A., Nguyen, S. N., Greenhalgh, E. S., Shaffer, M. S. P., Kucernak, A. R. J., Asp, L. E., Zenkert, Dan, and Linde, P.

Abstract

This study investigates the viability of implementing multifunctional structural power composites in a four-seater air taxi, the CityAirbus. For a given specific energy of the power source, the cruise endurance can be approximately doubled by using structural power composites as opposed to conventional batteries. Replacing all the eligible composite mass and batteries with structural power composites can reduce the CityAirbus weight by 25%. To achieve the current design performance, the minimum required elastic modulus, strength, specific energy and power for the structural power composite are 54 GPa, 203 MPa, 74 Wh/kg and 376 W/kg, respectively: current state-of-the-art structural power composites are now approaching this level of performance. Hence, structural power composites are considered feasible for adoption in the urban air mobility sector and have the potential to improve endurance and facilitate commercialization. This paper also discusses several key challenges that must be addressed to realize the adoption of structural power composites in future electric air taxis., QC 20230602

Published
2023
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5. Single‐atom Pt on carbon nanotubes for selective electrocatalysis.

Author

Hardisty, Samuel S., Lin, Xiaoqian, Kucernak, Anthony R. J., and Zitoun, David

Subjects
CARBON nanotubes, PROTON exchange membrane fuel cells, ELECTROCATALYSIS, OXYGEN reduction, OXIDATION-reduction reaction, HYDROGEN oxidation
Abstract

Utilizing supported single atoms as catalysts presents an opportunity to reduce the usage of critical raw materials such as platinum, which are essential for electrochemical reactions such as hydrogen oxidation reaction (HOR). Herein, we describe the synthesis of a Pt single electrocatalyst inside single‐walled carbon nanotubes (SWCNTs) via a redox reaction. Characterizations via electron microscopy, X‐ray photoelectron microscopy, and X‐ray absorption spectroscopy show the single‐atom nature of the Pt. The electrochemical behavior of the sample to hydrogen and oxygen was investigated using the advanced floating electrode technique, which minimizes mass transport limitations and gives a thorough insight into the activity of the electrocatalyst. The single‐atom samples showed higher HOR activity than state‐of‐the‐art 30% Pt/C while almost no oxygen reduction reaction activity in the proton exchange membrane fuel cell operating range. The selective activity toward HOR arose as the main fingerprint of the catalyst confinement in the SWCNTs. [ABSTRACT FROM AUTHOR]

Published
2024
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7. Phase-dependent growth of Pt on MoS2for highly efficient H2evolution

Author

Shi, Zhenyu, Zhang, Xiao, Lin, Xiaoqian, Liu, Guigao, Ling, Chongyi, Xi, Shibo, Chen, Bo, Ge, Yiyao, Tan, Chaoliang, Lai, Zhuangchai, Huang, Zhiqi, Ruan, Xinyang, Zhai, Li, Li, Lujiang, Li, Zijian, Wang, Xixi, Nam, Gwang-Hyeon, Liu, Jiawei, He, Qiyuan, Guan, Zhiqiang, Wang, Jinlan, Lee, Chun-Sing, Kucernak, Anthony R. J., and Zhang, Hua

Abstract

Crystal phase is a key factor determining the properties, and hence functions, of two-dimensional transition-metal dichalcogenides (TMDs)1,2. The TMD materials, explored for diverse applications3–8, commonly serve as templates for constructing nanomaterials3,9and supported metal catalysts4,6–8. However, how the TMD crystal phase affects the growth of the secondary material is poorly understood, although relevant, particularly for catalyst development. In the case of Pt nanoparticles on two-dimensional MoS2nanosheets used as electrocatalysts for the hydrogen evolution reaction7, only about two thirds of Pt nanoparticles were epitaxially grown on the MoS2template composed of the metallic/semimetallic 1T/1T′ phase but with thermodynamically stable and poorly conducting 2H phase mixed in. Here we report the production of MoS2nanosheets with high phase purity and show that the 2H-phase templates facilitate the epitaxial growth of Pt nanoparticles, whereas the 1T′ phase supports single-atomically dispersed Pt (s-Pt) atoms with Pt loading up to 10 wt%. We find that the Pt atoms in this s-Pt/1T′-MoS2system occupy three distinct sites, with density functional theory calculations indicating for Pt atoms located atop of Mo atoms a hydrogen adsorption free energy of close to zero. This probably contributes to efficient electrocatalytic H2evolution in acidic media, where we measure for s-Pt/1T′-MoS2a mass activity of 85 ± 23 A mgPt−1at the overpotential of −50 mV and a mass-normalized exchange current density of 127 A mgPt−1and we see stable performance in an H-type cell and prototype proton exchange membrane electrolyser operated at room temperature. Although phase stability limitations prevent operation at high temperatures, we anticipate that 1T′-TMDs will also be effective supports for other catalysts targeting other important reactions.

Published
2023
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13. Combining Electrochemical, Fluid Dynamic, and Imaging Analyses to Understand the Effect of Electrode Microstructure and Electrolyte on Redox Flow Batteries

Author

Simon, Benedict A., primary, Gayon Lombardo, Andrea, additional, Pino, Catalina, additional, Wood, Charles E., additional, Tenny, Kevin M., additional, Greco, Katharine, additional, Cooper, Samuel J., additional, Forner-Cuenca, Antoni, additional, Brushett, Fikile R., additional, Kucernak, Anthony R. J., additional, and Brandon, Nigel P, additional

Published
2020
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18. A quick and versatile one step metal–organic chemical deposition method for supported Pt and Pt-alloy catalysts

Author

Jackson, Colleen, primary, Smith, Graham T., additional, Mpofu, Nobuhle, additional, Dawson, Jack M. S., additional, Khoza, Thulile, additional, September, Caelin, additional, Taylor, Susan M., additional, Inwood, David W., additional, Leach, Andrew S., additional, Kramer, Denis, additional, Russell, Andrea E., additional, Kucernak, Anthony R. J., additional, and Levecque, Pieter B. J., additional

Published
2020
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20. High Performance Fuel Cell Catalysts Synthesized By Fe Metalation of Nitrogen Doped Carbons Derived from Metal Organic Framework ZIF-8

Author

Roy, Aaron Joseph, primary, Sougrati, Moulay Tahar, additional, Blanchard, Pierre-Yves, additional, Jones, Deborah, additional, Jaouen, Frederic, additional, Primbs, Mathias, additional, Strasser, Peter, additional, Mehmood, Asad, additional, Kucernak, Anthony R. J., additional, Kosmala, Tomasz, additional, Daniel, Giorgia, additional, and Durante, Christian, additional

Published
2019
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29. Electrotunable Nanoplasmonics for Amplified Surface Enhanced Raman Spectroscopy

Author

Ma, Ye, Sikdar, Debabrata, Fedosyuk, Aleksandra, Velleman, Leonora, Klemme, Daniel J., Oh, Sang-Hyun, Kucernak, Anthony R. J., Kornyshev, Alexei A., and Edel, Joshua B.

Abstract

Tuning the properties of optical metamaterials in real time is one of the grand challenges of photonics. Being able to do so will enable a class of adaptive photonic materials for use in applications such as surface enhanced Raman spectroscopy and reflectors/absorbers. One strategy to achieving this goal is based on the electrovariable self-assembly and disassembly of two-dimensional nanoparticle arrays at a metal | liquid interface. As expected, the structure results in plasmonic coupling between NPs in the array but perhaps as importantly between the array and the metal surface. In such a system, the density of the nanoparticle array can be reversibly controlled by the variation of electrode potential. Theory suggests that due to a collective plasmon-coupling effect  less than 1 V variation of electrode potential can give rise to a dramatic simultaneous change in optical reflectivity from ∼93% to ∼1% and the amplification of the SERS signal by up to 5 orders of magnitude. This is experimentally demonstrated using a platform based on the voltage-controlled assembly of 40 nm Au-nanoparticle arrays at a TiN/Ag electrode in contact with an aqueous electrolyte. We show that all the physics underpinning the behavior of this platform works precisely as suggested by the proposed theory, setting the electrochemical nanoplasmonics as a promising direction in photonics research.

Published
2020
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35. Structural supercapacitor electrolytes based on bicontinuous ionic liquid–epoxy resin systems

Author

Shirshova, Natasha, primary, Bismarck, Alexander, additional, Carreyette, Shuaijin, additional, Fontana, Quentin P. V., additional, Greenhalgh, Emile S., additional, Jacobsson, Per, additional, Johansson, Patrik, additional, Marczewski, Maciej J., additional, Kalinka, Gerhard, additional, Kucernak, Anthony R. J., additional, Scheers, Johan, additional, Shaffer, Milo S. P., additional, Steinke, Joachim H. G., additional, and Wienrich, Malte, additional

Published
2013
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38. General discussion

Author

Greef, R., primary, Bard, A. J., additional, Blackham, I. G., additional, Caffrey, M., additional, Tian, Z. W., additional, Fujishima, A., additional, Kruger, J., additional, Denuault, G., additional, Peter, L. M., additional, Schultze, J. W., additional, Bloor, D., additional, Goff, A. Hugot-Le, additional, Schiffrin, D. J., additional, Budevski, E., additional, Kucernak, A. R. J., additional, Williams, D. E., additional, Peat, R., additional, Graves, P., additional, Smyrl, W. H., additional, Fitzmaurice, D., additional, Bade, K., additional, and Uosaki, K., additional

Published
1992
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41. Hierarchical carbon aerogel modified carbon fiber composites for structural power applications

Author

Anthony, D. B., Nguyen, S. N., Senokos, E., Alexander Bismarck, Kucernak, A. R. J., Greenhalgh, E. S., Shaffer, M. S. P., Clean Sky Joint Undertaking, Engineering & Physical Science Research Council (EPSRC), and Engineering & Physical Science Research Council (E

Abstract

The desire to reduce overall weight in devices is a key driver for perpetual material development; the ability to combine composites with energy storage functions/capabilities which simultaneously provide structural integrity has the potential to supersede monofunctional components. To achieve this ambition, the multifunctional structure must perform both mechanical and energy storage functions sufficiently, but often there is a trade off in performance which is a significant challenge to overcome. Carbon aerogels have been shown to contribute positively to (electro-chemical double layer) capacitive performance due to an increased surface area in multifunctional carbon fiber based composite electrodes, but have also been shown to reduce mechanical properties; the addition of nanoscale reinforcers, such as carbon nanotubes, graphene or alike, with their superlative electrical and mechanical properties are proposed to address these concerns and create a truly hierarchical structure suitable for structural power applications.

44. Upper bounds on 'cold fusion' in electrolytic cells

Author

Williams, D. E., primary, Findlay, D. J. S., additional, Craston, D. H., additional, Sené, M. R., additional, Bailey, M., additional, Croft, S., additional, Hooton, B. W., additional, Jones, C. P., additional, Kucernak, A. R. J., additional, Mason, J. A., additional, and Taylor, R. I., additional

Published
1989
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