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Author = Hasan, Maksudul;
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Displaying Results 1 - 12 of 12 on page 1 of 1
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Core/shell (Cu/Cu2O) nanotubes as high performance anode materials for Li-ion rechargeable batteries
(2009)
Hasan, Maksudul; Chowdhury, Tamjid; Rohan, James F.
Core/shell (Cu/Cu2O) nanotubes as high performance anode materials for Li-ion rechargeable batteries
(2009)
Hasan, Maksudul; Chowdhury, Tamjid; Rohan, James F.
Abstract:
A direct electrodeposition technique for very high quality Cu nanotube arrays and subsequent conversion of the deposited Cu into Cu2O has been developed. The Cu2O nanotube arrays have high capacity, high cyclability and high rate capability. The cycling performance of Cu2O nanotubes show a high level of structural integrity with capacity retention even after 94 cycles when cycled at 1.67 mA/cm2. The outstanding electrochemical performance of the Cu2O nanotubes comes from high surface area, easy infiltration of electrolytes, high electrical conductivity of Cu core support and structural integrity of the oxide shell active material. The Cu2O nanotubes also eliminate the requirement of ancillary materials currently used in Li-ion batteries, such as carbon particles to increase conductivity. The easy fabrication and performance of Cu2O nanotube arrays may make them suitable for next generation Li-ion batteries.
http://hdl.handle.net/10468/7604
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Cu electrodeposition from methanesulfonate electrolytes for ULSI and MEMS applications
(2010)
Hasan, Maksudul; Rohan, James F.
Cu electrodeposition from methanesulfonate electrolytes for ULSI and MEMS applications
(2010)
Hasan, Maksudul; Rohan, James F.
Abstract:
Methanesulfonic acid (MSA) is an alternative to sulfuric acid electrolyte for metal deposition. The electrochemical nucleation and growth of Cu on a glassy carbon electrode in methanesulfonate was compared with sulfate baths. The overpotential for Cu deposition was much smaller in the MSA bath compared to the traditional sulfuric acid bath, and Cu nucleation occurred at a higher rate in the MSA bath. The measured diffusion coefficient value for Cu deposition from the MSA bath was 6.82x10(-6) cm(2)/s. UV-visible spectroscopic results confirmed that the coordination of Cu species was the same in both electrolytes. Cu electrodeposition on Ni sputtered Si substrate from the high efficiency MSA bath was photoresist-compatible with no void formation. One-dimensional Cu nanorods were also deposited through an anodized aluminum oxide template on a Ni evaporated seed layer substrate, showing potential applications as electrical interconnects in ultralarge scale integration (ULSI) and microel...
http://hdl.handle.net/10468/1346
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Electrochemical properties of Cu deposition from methanesulphonate electrolytes for ULSI and MEMS applications
(2009)
Hasan, Maksudul; Casey, Declan P.; Rohan, James F.
Electrochemical properties of Cu deposition from methanesulphonate electrolytes for ULSI and MEMS applications
(2009)
Hasan, Maksudul; Casey, Declan P.; Rohan, James F.
Abstract:
Methanesulphonic acid (MSA) is an alternative to sulphuric acid electrolytes. The electrochemical nucleation and growth of Cu on a glassy carbon (GC) electrode was studied from the methanesulphonate and sulphate baths. The overpotential for Cu deposition was much smaller in the MSA bath compared to the traditional sulphuric acid bath. Cu nucleation occurred at a higher rate in the MSA bath. The measured diffusion coefficient value for Cu deposition from the MSA bath was 6.82 x 10-6 cm2/s. The UV-Vis spectroscopic results confirmed that the coordination of Cu species was the same in both electrolytes. Cu electrodeposition on Ni sputtered Si substrate from the high efficiency MSA bath was found to be photoresist compatible with no void formation. 1D Cu nanorods were also deposited through AAO template on a Ni evaporated seed layer substrate showing potential applications as interconnects in ULSI and MEMS.
http://hdl.handle.net/10468/7605
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Electrochemically deposited Cu2O cubic particles on boron doped diamond substrate as efficient photocathode for solar hydrogen generation
(2017)
Mavrokefalos, Christos K.; Hasan, Maksudul; Rohan, James F.; Compton, Richard G.; Foord...
Electrochemically deposited Cu2O cubic particles on boron doped diamond substrate as efficient photocathode for solar hydrogen generation
(2017)
Mavrokefalos, Christos K.; Hasan, Maksudul; Rohan, James F.; Compton, Richard G.; Foord, John S.
Abstract:
Herein, we report a novel photocathode for the water splitting reaction. The electrochemical deposition of Cu2O particles on boron doped diamond (BDD) electrodes and the subsequent decoration with NiO nanoparticles by a dip coating method to act as co-catalyst for hydrogen evolution reaction is described. The morphology analysis by scanning electron microscope (SEM) revealed that Cu2O particles are cubic and decorated sporadically with NiO nanoparticles. X-ray photoelectron spectroscopy (XPS) confirmed the electronic interaction at the interface between Cu2O and NiO through a binding energy shift of the main Cu 2p peak. The photoelectrochemical (PEC) performance of NiO-Cu2O/BDD showed a much higher current density (-0.33 mA/cm2) and photoconversion efficiency (0.28%) compared to the unmodified Cu2O/BDD electrode, which are only -0.12 mA/cm2 and 0.06%, respectively. The enhancement in PEC performance is attributable to the synergy of NiO as an electron conduction mediator leading to ...
http://hdl.handle.net/10468/3707
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Electrochemically modified boron-doped diamond electrode with Pd and Pd-Sn nanoparticles for ethanol electrooxidation
(2017)
Mavrokefalos, Christos K.; Hasan, Maksudul; Khunsin, Worawut; Schmidt, Michael; Maier, ...
Electrochemically modified boron-doped diamond electrode with Pd and Pd-Sn nanoparticles for ethanol electrooxidation
(2017)
Mavrokefalos, Christos K.; Hasan, Maksudul; Khunsin, Worawut; Schmidt, Michael; Maier, Stefan A.; Rohan, James F.; Compton, Richard G.; Foord, John S.
Abstract:
The modification of hydrogen terminated boron-doped diamond (HBDD) electrode with pure palladium (Pd) and Pd-Sn (tin) nanoparticles is described in this study. For synthesis of Sn/HBDD and Pd-Sn/HBDD electrode, a potentiostatic two-step electrochemical method involving the electrodeposition of Sn followed by Pd was used, respectively. The modification of the HBDD electrode with Sn and noble metal Pd by forming bimetallic Pd-Sn nanoparticle leads to a higher electrocatalytic activity. The electrocatalytic activity of the bimetallic Pd-Sn nanoparticles was evaluated towards the electrooxidation of ethanol in alkaline media and compared with that of the Pd nanoparticles alone. The bimetallic Pd-Sn nanoparticles modified HBDD electrode exhibits higher current densities and less poisoning effects during ethanol electrooxidation compared to Pd/HBDD. The proper tuning of the Pd loading on a foreign metal along with the surface termination effects of the BDD electrode plays a crucial role i...
http://hdl.handle.net/10468/4246
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Energy storage: battery materials and architectures at the nanoscale
(2014)
Rohan, James F.; Hasan, Maksudul; Patil, Sanjay; Casey, Declan P.; Clancy, Tomás M.
Energy storage: battery materials and architectures at the nanoscale
(2014)
Rohan, James F.; Hasan, Maksudul; Patil, Sanjay; Casey, Declan P.; Clancy, Tomás M.
http://hdl.handle.net/10468/1650
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Enhanced mass activity and stability of bimetallic Pd-Ni nanoparticles on boron-doped diamond for direct ethanol fuel cell applications
(2017)
Mavrokefalos, Christos K.; Hasan, Maksudul; Rohan, James F.; Foord, John S.
Enhanced mass activity and stability of bimetallic Pd-Ni nanoparticles on boron-doped diamond for direct ethanol fuel cell applications
(2017)
Mavrokefalos, Christos K.; Hasan, Maksudul; Rohan, James F.; Foord, John S.
Abstract:
In this work, electrochemical deposition of Pd (palladium) and bimetallic Pd-Ni (nickel) nanoparticles on oxygen-terminated boron-doped diamond (BDD) substrate is described for use as electrocatalyst in direct ethanol fuel cell. A potentiostatic two-step electrochemical method involving the electrodeposition of Ni nanoparticles on BDD followed by mono-dispersed Pd nanoparticles was used for the fabrication of Pd-Ni/BDD electrode. The electrocatalytic activity of the bimetallic Pd-Ni nanoparticles was evaluated in an alkaline solution containing ethanol and compared to that of the Pd nanoparticles alone. The bimetallic Pd-Ni nanoparticles showed 2.4 times higher mass activity than the similar systems from literature as well as stability when operated in alkaline media. Higher electrochemical response towards the electrooxidation of ethanol observed for the bimetallic electrocatalysts was due to the synergistic effects of the electron interaction at the interface of the two metals. Ch...
http://hdl.handle.net/10468/5179
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Facile electrochemical synthesis of Pd nanoparticles with enhanced electrocatalytic properties from surfactant-free electrolyte
(2017)
Hasan, Maksudul; Khunsin, Worawut; Mavrokefalos, Christos K.; Maier, Stefan A.; Rohan, ...
Facile electrochemical synthesis of Pd nanoparticles with enhanced electrocatalytic properties from surfactant-free electrolyte
(2017)
Hasan, Maksudul; Khunsin, Worawut; Mavrokefalos, Christos K.; Maier, Stefan A.; Rohan, James F.; Foord, John S.
Abstract:
Synthesis of low-dimensional metallic nanoparticles with a clean surface, high dispersibility, and enhanced atomic surface distribution is extremely important, as these factors strongly influence the electrocatalytic properties of the nanoparticles. In this study, the early stage electrochemical nucleation and growth of palladium nanoparticles (Pd NPs) under potentiostatic control has been investigated on a Au(111) textured substrate. The size distribution and structural characterization of the ex situ as-deposited Pd NPs by means of high-resolution field emission gun-scanning electron microscopy (FEG-SEM) at different stages combined with electrochemical measurements revealed that the cluster of nuclei grew independently through the reduction of metal ions. The electrodeposited Pd NPs were very pure, as confirmed by X-ray photoelectron spectroscopy (XPS), owing to the surfactant-free green electrodeposition process, and they exhibited a highly dispersed average particle size of 2–5...
http://hdl.handle.net/10468/5239
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Nanotemplated platinum fuel cell catalysts and copper-tin lithium battery anode materials for microenergy devices
(2011)
Rohan, James F.; Hasan, Maksudul; Holubowitch, Nicolas E.
Nanotemplated platinum fuel cell catalysts and copper-tin lithium battery anode materials for microenergy devices
(2011)
Rohan, James F.; Hasan, Maksudul; Holubowitch, Nicolas E.
Abstract:
Nanotemplated materials have significant potential for applications in energy conversion and storage devices due to their unique physical properties. Nanostructured materials provide additional electrode surface area beneficial for energy conversion or storage applications with short path lengths for electronic and ionic transport and thus the possibility of higher reaction rates. We report on the use of controlled growth of metal and alloy electrodeposited templated nanostructures for energy applications. Anodic aluminium oxide templates fabricated on Si for energy materials integration with electronic devices and their use for fuel cell and battery materials deposition is discussed. Nanostructured Pt anode catalysts for methanol fuel cells are shown. Templated CuSn alloy anodes that possess high capacity retention with cycling for lithium microbattery integration are also presented.
http://hdl.handle.net/10468/1098
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Nanotubes of core/shell Cu/Cu2O as anode materials for Li-ion rechargeable batteries
(2010)
Hasan, Maksudul; Chowdhury, Tamjid; Rohan, James F.
Nanotubes of core/shell Cu/Cu2O as anode materials for Li-ion rechargeable batteries
(2010)
Hasan, Maksudul; Chowdhury, Tamjid; Rohan, James F.
Abstract:
A direct electrodeposition technique for Cu nanotube array fabrication and the subsequent conversion of the deposited Cu into Cu2O was developed. The Cu2O nanotube arrays showed high capacity, cyclability, and rate capability. The cycling performance of the Cu2O nanotubes showed a high level of structural integrity with capacity retention even after 94 cycles when cycled at 1C to 3C rates. The enhanced electrochemical performance of the Cu2O nanotubes came from a high surface area, electrolyte access, high electrical conductivity of Cu core support, and structural integrity of the oxide shell active material.
http://hdl.handle.net/10468/1347
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Ni nanowire supported 3D flower-like Pd nanostructures as an efficient electrocatalyst for electrooxidation of ethanol in alkaline media
(2012)
Newcomb, Simon B.; Hasan, Maksudul; Rohan, James F.; Razeeb, Kafil M.
Ni nanowire supported 3D flower-like Pd nanostructures as an efficient electrocatalyst for electrooxidation of ethanol in alkaline media
(2012)
Newcomb, Simon B.; Hasan, Maksudul; Rohan, James F.; Razeeb, Kafil M.
Abstract:
A Ni nanowire array (NiNWA) supported three-dimensional flower-like Pd nano-electrocatalyst with high electrocatalytic performance for the electrooxidation of ethanol in alkaline media has been fabricated by borohydride hydrothermal reduction method. This novel hybrid NiNWA/PdNF (nanoflowers) electrocatalyst exhibits large electrochemically active surface area (EASA, 45 m2 g−1(Pd)), excellent electrocatalytic activity (765 mA mg−1(Pd)), and high level of the poisoning tolerance (If/Ib = 1.2) to the carbonaceous oxidative intermediates for the electrooxidation reaction in alkaline media. In addition, the electrochemical stability of NiNWA/PdNF is significantly higher than that of NiNWA/PdNP (nanoparticles) electrocatalyst, as evidenced by chronoamperometry experiments in which the electrooxidation current of nanoflowers is controlled by the diffusion transport of ethanol species rather than the carbonaceous poisoning. This high electrocatalytic activity can be attributed to the more ...
http://hdl.handle.net/10468/7657
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Sn-based micro and nano lithium battery materials
(2014)
Clancy, Tomás M.; Hasan, Maksudul; Rohan, James F.
Sn-based micro and nano lithium battery materials
(2014)
Clancy, Tomás M.; Hasan, Maksudul; Rohan, James F.
Abstract:
Energy provision and storage are significant and critical issues for wireless sensor network (WSN) applications. Hybrid energy devices incorporating energy harvesting and storage requires the development of enhanced energy storage materials and architectures. A decreased footprint with the same energy capability is desirable to maximise the energy density and enable long-life wireless sensors. Methods to structure active and support battery materials enhance the device characteristics offering mechanical and electrical support. The results below are for materials that can be processed in 3D or 1D to decrease the footprint of the energy storage element. The effect of the support material is also shown to be significant and directly relevant for high aspect ratio nanostructure where the lithium active materials experience volume changes during charge and discharge.
http://hdl.handle.net/10468/7595
Displaying Results 1 - 12 of 12 on page 1 of 1
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