Profile
Keywords: nanomaterials, surface chemistry, battery research, hybrid materials, battery materials, photoluminescence, metamaterials, silicon chemistry, germanium chemistry
FES Funded Projects Outputs Show only Author
Title
Category
Date
Authors
Projects
Mn3O4 Nanoparticle-Decorated Hollow Mesoporous Carbon Spheres as an Efficient Catalyst for Oxygen Reduction Reaction in Zn-air Batteries Hybrids of Mn3O4 nanoparticles and hollow carbon spheres prepared from templated pyrolysis of polydopamine were assembled via a straightforward sonication procedure. The resulting hybrids exhibit excellent catalytic activity toward the oxygen reduction reaction (ORR) in prototype Zn–air batteries. Impressively, these catalysts exhibit higher discharge potential and exceptional stability when compared to commercial Pt–Ru catalysts while simultaneously showing comparable onset potential and maximum current density.T06-P03 University of Alberta Publication 2020-06-19 T06-P03 Hollow Mesoporous Carbon Nanospheres Decorated with Metal Oxide Nanoparticles as Efficient Earth-Abundant Zinc-Air Battery Catalysts Hybrids comprising hollow mesoporous nitrogen doped carbon (HMC) nanospheres and metal oxide-nanoparticles were prepared via a hydrothermal synthesis. These materials exhibit excellent bifunctional catalytic activity in the oxygen reduction and evolution reactions (ORR and OER, respectively) that core to the efficient operation of Zn-air batteries. When incorporated into prototype devices, Co3O4 and MnCo2O4 nanoparticle decorated HMC exhibited discharge potentials of 1.26 and 1.28 V at 10 mA cm-2, respectively. ‘CoFeNiO’ decorated HMC exhibited a charging potential of 1.96 V at 10 mA cm-2. These metrics are much superior to benchmark Pt-Ru, which displayed discharge and charging potentials of 1.25 and 2.01 V, respectively, at the same current density. The battery equipped with Co3O4 decorated HMC demonstrated 63% initial efficiency before cycling. After cycling at 10 mA cm-2 for 200 hours, the battery efficiency was maintained at 56.5%, outperforming the battery with Pt-Ru (50.2% after 50 h).T06-P03 University of Alberta Publication 2021-01-07 Yingjie He, Drew Aasen, Alexandra McDougall, Haoyang Yu, Matthew Labbe, Chuyi Ni, Sarah Milliken,
Ivey, D. ,
Veinot, J. T06-P03 Front Cover: Hollow Mesoporous Carbon Nanospheres Decorated with Metal Oxide Nanoparticles as Efficient Earth-Abundant Zinc-Air Battery Catalysts The Front Cover shows an artistic representation of a new class of bifunctional zinc‐air battery catalysts that consist of hollow mesoporous carbon nanospheres decorated with various precious‐metal‐free transition‐metal oxide nanoparticles.T06-P03 University of Alberta Publication 2021-03-22 Yingjie He, Drew Aasen, Alexandra McDougall, Haoyang Yu, Matthew Labbe, Chuyi Ni, Sarah Milliken,
Ivey, D. ,
Veinot, J. T06-P03 Exploring Structural Nuances in Germanium Halide Perovskites Using Solid-State $\less$sup$\greater$73$\less$/sup$\greater$Ge and $\less$sup$\greater$133$\less$/sup$\greater$Cs NMR Spectroscopy T06-Z01 University of Alberta Publication 2022-02-01 T06-Z01 Interfacing Enzymes with Silicon-Based Nanoparticles through the Amide Coupling Reaction T02-Z01 University of Alberta Activity 2018-05-30 Christopher Robidillo, Maryam Aghajamali,
" Sinelnikov, R.
" , M A Islam,, A V Geisler,, Xiyu Zhang,
" Faramus, A.
" ,
Veinot, J. T02-Z01 Ultrabright Fluorescent and Lasing Microspheres from a Conjugated Polymer T02-Z01 University of Alberta Publication 2018-06-21 Kirsty Gardner, Maryam Aghajamali,
" Vagin, S.
" ,
" Pille, J.
" , William Morrish,
Veinot, J. , Al Meldrum,
" Rieger, B.
" T02-Z01 Water-Assisted Transfer Patterning of Nanomaterials T06-Z01 University of Alberta Publication 2018-07-19 T06-Z01 Silicon Nanocrystals: From Solution to Solid State T06-Z01 Publication 2018-06-11 Maryam Aghajamali
T06-Z01 Hybrid Nanomaterials for Photocatalytic Conversion of CO2 T06-Z01 Activity 2018-05-29 Alyx Thiessen
T06-Z01 Insights into the Structure of Silicon Nanocrystals T06-Z01 University of Alberta Activity 2019-02-12 T06-Z01 Endogenous Dynamic Nuclear Polarization NMR of Hydride-Terminated Silicon Nanoparticles T02-Z01 University of Alberta Publication 2019-04-13 T02-Z01 Understanding the Anatomy of a Silicon Nanocrystal T06-Z01 University of Alberta Activity 2019-05-03 Alyx Thiessen, Michelle Ha, Riley Hooper, Jonathan G C Veinot,
Michaelis, V. T06-Z01 Understanding the Anatomy of a Silicon Nanocrystal T06-Z01 University of Alberta Activity 2019-06-01 Alyx Thiessen, Michelle Ha, Riley Hooper, Jonathan G C Veinot,
Michaelis, V. T06-Z01 H-SiNP: Cutting Through the Layers Using 29Si MAS and DNP NMR T02-Z01 University of Alberta Activity 2019-09-01 T02-Z01 A Tale of Seemingly “Identical” Silicon Quantum Dot Families: Structural Insight into Silicon Quantum Dot Photoluminescence T06-Z01 University of Alberta Publication 2020-06-29 Alyx Thiessen,
Veinot, J. , Lijuan Zhang, Anton Oliynyk, Haoyang Yu, Kevin O'Connor, Al Meldrum
T06-Z01 Dehydrocoupling – an alternative approach to functionalizing germanium nanoparticle surfaces T12-Z01 University of Alberta Publication 2020-02-05 Md Asjad Hossain,
" Morteza Javadi
" , Haoyang Yu, Alyx Thiessen, Nduka Ikpo, Anton Oliynyk,
Veinot, J. T12-Z01 Silicon Nanoparticles from the Inside Out: Exploring the Internal Structure of Silicon Nanoparticles and Its Impact on Their Photoluminescence T06-Z01 Publication 2020-08-24 Alyx Thiessen
T06-Z01 “Turning the dials”: controlling synthesis, structure, composition, and surface chemistry to tailor silicon nanoparticle properties T02-Z01, T06-Z01, T12-Z01, T12-Q01 University of Alberta Publication 2021-01-01 Sarah Milliken, Alyx Thiessen, I Teng Cheong, Kevin O'Connor, Ziqi Li, Riley Hooper, Christopher Robidillo,
Veinot, J. T02-Z01, T06-Z01, T12-Z01, T12-Q01 Thermally Induced Dehydrogenative Coupling of Organosilanes and H-Terminated Silicon Quantum Dots onto Germanane Surfaces T06-Z01, T12-Z01 University of Alberta Publication 2020-04-01 Haoyang Yu, Alyx Thiessen, Md Asjad Hossain, Marc Julian Kloberg, Bernhard Rieger,
Veinot, J. T06-Z01, T12-Z01 Synthesis, Properties, and Derivatization of Poly(dihydrogermane): A Germanium-Based Polyethylene Analogue T02-Z01, T06-Z01 University of Alberta Publication 2021-04-16 Haoyang Yu, Chuyi Ni, Alyx Thiessen, Ziqi Li,
Veinot, J. T02-Z01, T06-Z01 Hydride Terminated SiNP:Cutting through the Layers Using 29Si MAS and DNP NMR Spectroscopy T02-Z01, T06-Z01 University of Alberta Activity 2020-02-01 T02-Z01, T06-Z01 Shining in a New Size Regime: Silicon Nanoparticle Assemblies T06-Z01 Activity 2020-11-11 Kevin O'Connor
T06-Z01 Graduate Student Scholarship T06-Z01 Award 2021-03-10 Chuyi Ni
T06-Z01 Photocatalytic mechanism control and study of carrier dynamics in CdS@C3N5 core-shell nanowires We present a potential solution to the problem of extraction of photogenerated holes from CdS nanocrystals and nanowires. The nanosheet form of C3N5 is a low bandgap (Eg = 2.03 eV), azo-linked graphenic carbon nitride framework formed by the polymerization of melem hydrazine (MHP). C3N5 nanosheets were either wrapped around CdS nanorods (NRs) following the synthesis of pristine chalcogenide or intercalated among them by an in situ synthesis protocol to form two kinds of heterostructures, CdS-MHP and CdS-MHPINS respectively. CdS-MHP improved the photocatalytic degradation rate of 4-nitrophenol by nearly an order of magnitude in comparison to bare CdS NRs. CdS-MHP also enhanced the sunlight-driven photocatalytic activity of bare CdS NWs for the decolorization of rhodamine B (RhB) by a remarkable 300% through the improved extraction and utilization of photogenerated holes due to surface passivation. More interestingly, CdS-MHP provided reaction pathway control over RhB degradation. In the absence of scavengers, CdS-MHP degraded RhB through the N-deethylation pathway. When either hole scavenger or electron scavenger was added to the RhB solution, the photocatalytic activity of CdS-MHP remained mostly unchanged while the degradation mechanism shifted to the chromophore cleavage (cycloreversion) pathway. We investigated the optoelectronic properties of CdS-C3N5 heterojunctions using density functional theory (DFT) simulations, FDTD simulations, time-resolved terahertz spectroscopy (TRTS) and photoconductivity measurements. TRTS indicated high carrier mobilities > 450 cm2Vs-1 and carrier relaxation times > 60 ps for CdS-MHP while CdS-MHPINS exhibited much lower mobilities < 150 cm2Vs-1 and short carrier relaxation times <20 ps. Hysteresis in the photoconductive J-V characteristics of CdS NWs disappeared in CdS-MHP confirming surface passivation. Dispersion-corrected DFT simulations indicated a delocalized HOMO and a LUMO localized on C3N5 in CdS-MHP. C3N5, with its extended π-conjugation and low bandgap can function as a shuttle to extract carriers and excitons in nanostructured heterojunctions, and enhance performance in optoelectronic devices. Our results demonstrate how carrier dynamics in core-shell heterostructures can be manipulated to achieve control over the reaction mechanism in photocatalysis. T12-P02, T12-P03, T06-Z01, T12-Z01 University of Alberta Publication 2021-04-30 Kazi Alam, Charles Jensen, Pawan Kumar, Riley Hooper, Guy Bernard, Aakash Patidar, Ajay Manuel,
" N Amer
" ,
" A Palmgren
" , Narendra Chaulagain, David Purschke, John Garcia, Phillip Suwan Kirwin, Lian Shoute,
" K. Cui
" ,
" S. Gusarov
" ,
" A. Kobryn
" ,
Michaelis, V. , Frank Hegmann, Karthik Shankar
T12-P02, T12-P03, T06-Z01, T12-Z01 Transtion-metal doping SiNPs T06-Z01 Activity 2020-11-11 Riley Hooper
T06-Z01 Alexander Graham Bell Canada Graduate Scholarship T12-Q01 Award 2020-09-19 Riley Hooper
T12-Q01 Goddard Yuk-Tat Lauw and Yau-Chun Lau (Mak) Memorial Graduate Scholarship T12-Q01 Award 2020-09-20 Riley Hooper
T12-Q01 Rare-earth-doped La3Si2S8I: Potential materials for phosphor-converted white LEDs T12-P01 University of Alberta Activity 2024-06-03 T12-P01 Atomic Cartography of High‐Entropy Cs2BCl6 Perovskite‐Inspired Materials: The Vital Role of Solid‐State NMR Spectroscopy in Identifying Elemental Disorder T06-Z01-LBP1 University of Alberta Publication 2025-01-01 Phan, B. , Diganta Sarkar, Kishor Das, Riley Hooper,
Dey, T. , Michael J Ferguson, Xiaolong Liu,
Veinot, J. ,
Michaelis, V. T06-Z01-LBP1 Accelerated discovery of perovskites and prediction of band gaps using machine-learning methods Contributed oral presentationT12-P01 University of Alberta Activity 2019-06-07 Alex Gzyl, Jonathan Trach, Anton Oliynyk,
Mar, A. T12-P01 Silicon Quantum Dot–Polymer Fabry–Pérot Resonators with Narrowed and Tunable Emissions T02-Z01, T06-Z01, T12-Z01 University of Alberta Publication 2021-05-01 I Teng Cheong, William Morrish, William Sheard, Haoyang Yu, Bruno Luppi, Leanne Milburn, Al Meldrum,
Veinot, J. T02-Z01, T06-Z01, T12-Z01 Functional Bioinorganic Hybrids from Enzymes and Silicon Quantum Dots T02-Z01 University of Alberta Activity 2018-05-29 T02-Z01 Photoluminescence dynamics of functionalized two-dimensional silicon nanosheets T12-Z01 University of Alberta Activity 2018-06-21 Mary Narreto,
" A Lyuleeva
" ,
" T Helbich
" ,
Veinot, J. ,
" R Rieger
" , Frank Hegmann
T12-Z01 Interfacing Enzymes with Silicon Nanocrystals Conference posterT02-Z01 University of Alberta Activity 2018-09-18 T02-Z01 Interfacing Enzymes with Silicon Nanocrystals Conference presentationT02-Z01 University of Alberta Activity 2018-09-18 T02-Z01 Preparation of Enzyme-Silicon Nanocrystal Hybrids Through the Amide Coupling and Thiol-Ene Reactions T02-Z01 University of Alberta Activity 2018-10-01 T02-Z01 Thermally Responsive Photoluminescent Hybrids from Silicon Quatum Dots and Elastin-Like Polypeptides T02-Z01 University of Alberta Activity 2019-09-11 Christopher Robidillo, M S Bahniuk,,
" Wandelt, S.
" ,
" Matharu, G.
" , L D Unsworth,,
Veinot, J. T02-Z01 Ratiometric Detection of Nerve Agents by Coupling Complementary Properties of Silicon-Based Quantum Dots and Green Fluorescent Protein T02-Z01 University of Alberta Publication 2019-08-15 Christopher Robidillo,
" S Wandelt
" ,
" R Dalangin
" , Lijuan Zhang, Haoyang Yu, Al Meldrum,
" Robert Campbell
" ,
Veinot, J. T02-Z01 Functional Bioinorganic Hybrids from Enzymes and Silicon-Based Quantum Dots T02-Z01 University of Alberta Activity 2019-12-11 T02-Z01 Ratiometric Detection of Nerve Agents Using Silicon-Based Quantum Dots and Green Fluorescent Protein T02-Z01 University of Alberta Activity 2019-12-11 T02-Z01 Surface Functionalization of Germanium Nanosheets T06-Z01 University of Alberta Activity 2018-05-22 Haoyang Yu,
" T Helbich
" ,
" J Chen
" , M L Scherf,
" Kai Cui
" ,
" T Fassler
" ,
" B Rieger
" ,
Veinot, J. T06-Z01 Surface Functionalization of Germanium Nanosheets T06-Z01 University of Alberta Activity 2018-09-12 T06-Z01 Mesoporous GeOx/Ge/C as a Highly Reversible Anode Material with High Specific Capacity for Lithium-Ion Batteries T06-Z01 University of Alberta Publication 2020-09-20 " Nuri Hohn
" ,
" Xiaoyan Wang
" , Michael A Giebel,
" Shanshan Yin
" ,
" David Müller
" , Andreas E Hetzenecker,
" Lorenz Biebmann
" , Lucas P Kreuzer, Gilles E Möhl, Haoyang Yu,
Veinot, J. , Thomas F Fässler,
" Ya-Jun Cheng
" ,
" Peter Müller-Buschbaum
" T06-Z01 Tailoring B-doped silicon nanocrystal surface chemistry via phosphorus pentachloride – mediated surface alkoxylation T06-Z01, T12-Z01 University of Alberta Publication 2021-01-01 T06-Z01, T12-Z01 Surface-Anisotropic Janus Silicon Quantum Dots via Masking on 2D Silicon Nanosheets T06-Z01 University of Alberta Publication 2021-08-01 Marc Julian Kloberg, Haoyang Yu,
" Elisabeth Gross
" , Felix Eckmann, Tassilo M F Restle, Thomas F Fässler,
Veinot, J. , Bernhard Rieger
T06-Z01 Silicon Surface Passivation for Silicon-Colloidal Quantum Dot Heterojunction Photodetectors T12-Z01 University of Alberta Publication 2021-11-01 Qiwei Xu, I Teng Cheong,
" Lingju Meng
" ,
Veinot, J. , Xihua Wang
T12-Z01 Tailoring Ordered Mesoporous Titania Films via Introducing Germanium Nanocrystals for Enhanced Electron Transfer Photoanodes for Photovoltaic Applications T12-Z01 University of Alberta Publication 2021-06-01 Nian Li, Renjun Guo, Wei Chen, Volker Körstgens, Julian E Heger, Suzhe Liang, Calvin J Brett, Md Asjad Hossain, Jianshu Zheng, Peter S Deimel, Ali Buyruk, Francesco Allegretti, Matthias Schwartzkopf,
Veinot, J. , Guido Schmitz, Johannes V Barth, Tayebeh Ameri, Stephan V Roth, Peter Müller-Buschbaum
T12-Z01
