A5014348723- Electrocatalysts for Energy Conversion
- CO2 Reduction Techniques and Catalysts
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Advanced battery technologies research
- Advanced Photocatalysis Techniques
- TiO2 Photocatalysis and Solar Cells
- Electrochemical Analysis and Applications
- Ionic liquids properties and applications
- Fuel Cells and Related Materials
- Perovskite Materials and Applications
- Machine Learning in Materials Science
- Carbon Dioxide Capture Technologies
- Magnetism in coordination complexes
- Advanced Nanomaterials in Catalysis
- Ammonia Synthesis and Nitrogen Reduction
- Lanthanide and Transition Metal Complexes
- Copper-based nanomaterials and applications
- Advancements in Solid Oxide Fuel Cells
- Metal complexes synthesis and properties
- Metal-Catalyzed Oxygenation Mechanisms
- Polyoxometalates: Synthesis and Applications
- Organic Light-Emitting Diodes Research
- Advanced Memory and Neural Computing
- Photochemistry and Electron Transfer Studies
University of British Columbia
2016-2025
Canadian Institute for Advanced Research
2019-2025
MaRS Innovation
2022
Institut National de l'Énergie Solaire
2022
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2022
Google (United States)
2020
University of Calgary
2008-2017
Vancouver Biotech (Canada)
2014-2017
Indiana University Bloomington
2015
Northwest University
2015
Large-scale electrolysis of water for hydrogen generation requires better catalysts to lower the kinetic barriers associated with oxygen evolution reaction (OER). Although most OER are based on crystalline mixed-metal oxides, high activities can also be achieved amorphous phases. Methods producing materials, however, not typically amenable compositions. We demonstrate that a low-temperature process, photochemical metal-organic deposition, produce (mixed) metal oxide films catalysis. The...
ConspectusElectrocatalytic CO2 conversion at near ambient temperatures and pressures offers a potential means of converting waste greenhouse gases into fuels or commodity chemicals (e.g., CO, formic acid, methanol, ethylene, alkanes, alcohols). This process is particularly compelling when driven by excess renewable electricity because the consequent production solar would lead to closing carbon cycle. However, such technology not currently commercially available. While electrolysis in...
Photochemical metal–organic deposition (PMOD) was used to prepare amorphous metal oxide films containing specific concentrations of iron, cobalt, and nickel study how composition affects heterogeneous electrocatalytic water oxidation. Characterization the by energy-dispersive X-ray spectroscopy photoelectron confirmed excellent stoichiometric control each 21 complex investigated. In studying electrochemical oxidation catalyzed respective films, it found that small iron produced a significant...
Practical electrochemical carbon dioxide (CO2) conversion requires a catalyst capable of mediating the efficient formation single product with high selectivity at current densities. Solid-state electrocatalysts achieve CO2 reduction reaction (CO2RR) densities ≥ 150 milliamperes per square centimeter (mA/cm2), but maintaining selectivities and efficiencies remains challenge. Molecular CO2RR catalysts can be designed to low overpotentials only irrelevant commercial operation. We show here that...
An autonomous laboratory for thin film discovery is used to optimize the doping and annealing of organic semiconductors.
Abstract Molecular catalysts that combine high product selectivity and current density for CO 2 electrochemical reduction to or other chemical feedstocks are urgently needed. While earth-abundant metal-based molecular electrocatalysts with conversion known, they characterized by densities significantly lower than those obtained solid-state metal materials. Here, we report a cobalt phthalocyanine bearing trimethyl ammonium group appended the macrocycle is capable of reducing in water activity...
The pH-dependent electrochemical behavior for a Co(II) complex, [Co(Py5)(OH2)](ClO4)2 (1; Py5 = 2,6-(bis(bis-2-pyridyl)methoxymethane)pyridine), indicates consecutive (proton-coupled) oxidation steps furnish CoIV species that catalyzes the of water in basic media.
The conversion of CO2 to CO is demonstrated in an electrolyzer flow cell containing a bipolar membrane at current densities 200 mA/cm2 with Faradaic efficiency 50%. Electrolysis was carried out by delivering gaseous the cathode silver catalyst integrated carbon-based gas diffusion layer. Nonprecious nickel foam strongly alkaline electrolyte (1 M NaOH) used mediate anode reaction. While configuration where and were separated only found be unfavorable for robust reduction, modified...
The mechanistic details of the Ce(IV)-driven oxidation water mediated by a series structurally related catalysts formulated as [Ru(tpy)(L)(OH2)]2+ [L = 2,2′-bipyridine (bpy), 1; 4,4′-dimethoxy-2,2′-bipyridine (bpy-OMe), 2; 4,4′-dicarboxy-2,2′-bipyridine (bpy-CO2H), 3; tpy 2,2′;6′′,2′′-terpyridine] is reported. Cyclic voltammetry shows that each these complexes undergo three successive (proton-coupled) electron-transfer reactions to generate [RuV(tpy)(L)O]3+ ([RuV=O]3+) motif; relative...
The electrolysis of CO2 to syngas (CO + H2) using nonprecious metal electrocatalysts was studied in bipolar membrane-based electrochemical cells. Electrolysis carried out aqueous bicarbonate and humidified gaseous on the cathode side cell, with Ag or Bi/ionic liquid electrocatalysts. In both cases, stable currents were observed over a period hours an alkaline electrolyte NiFeOx electrocatalyst anode cell. contrast, performance cells degraded rapidly when conventional anion- cation-exchange...
A family of compounds based on the mononuclear coordination complex [Ru(tpy)(bpy)(OH2)]2+ (1b; tpy = 2,2′:6′,2′′-terpyridine, bpy 2,2′-bipyridine) are shown to be competent catalysts in Ce(IV)-driven oxidation water acidic media. The systematic installation electron-withdrawing (e.g., −Cl, −COOH) and −donating −OMe) groups at various positions about periphery polypyridyl framework offers insight into how electronic parameters affect properties catalysts. It is observed, general, that (EWGs)...
A series of heteroleptic bis(tridentate) ruthenium(II) complexes, each bearing a substituted 2,2′:6′,2″-terpyridine (terpy) ligand, is characterized by room temperature microsecond excited-state lifetimes. This observation consequence the strongly σ-donating and weakly π-accepting tridentate carbene 2′,6′-bis(1-mesityl-3-methyl-1,2,3-triazol-4-yl-5-idene)pyridine (C∧N∧C), adjacent to terpy maintaining large separation between ligand field metal-to-ligand charge transfer (MLCT) states while...
Light-driven decomposition of Ir(acac)3 spin-cast on a conducting glass substrate produces thin conformal film amorphous iridium oxide, a-IrOx. The process, which was carried out under an ambient atmosphere at room temperature and tracked by Fourier transform infrared (FTIR) spectroscopy, appears to proceed way ligand-to-metal charge transfer (LMCT) process. nature the films is based lack any observable Bragg reflections powder X-ray diffraction techniques; elemental composition corroborated...
The pH at the electrocatalyst surface plays a key role in defining activity and selectivity of CO2 reduction reaction (CO2RR). We report here operando Raman measurements catalyst customized CO2RR flow cell that enable measure pH. Using this cell, we were able to as function time, current density, proximity during electrolysis bicarbonate solutions. observed increasing density from 0 200 mA cm–2 increased 8.5 10.3. also show operation elevated temperatures (70 °C) results an serves suppress...
There is a global effort to convert sunlight into fuels by photoelectrochemically splitting water form hydrogen fuels, but the dioxygen byproduct bears little economic value. This raises important question of whether higher value commodities can be produced instead dioxygen. We report here photoelectrochemistry at BiVO4 photoanode involving oxidation substrates in organic media. The use MeCN enables broader set chemical transformations performed (e.g., alcohol and C-H activation/oxidation),...
ADVERTISEMENT RETURN TO ISSUEPREVViewpointNEXTVoltage Matters When Reducing CO2 in an Electrochemical Flow CellDanielle SalvatoreDanielle SalvatoreDepartment of Chemical and Biological Engineering, The University British Columbia, 2360 East Mall, Vancouver, Columbia V6T 1Z3, CanadaMore by Danielle Salvatore Curtis P. Berlinguette*Curtis BerlinguetteDepartment CanadaDepartment Chemistry, 2036 Main 1Z1, CanadaStewart Blusson Quantum Matter Institute, 2355 1Z4, CanadaCanadian Institute for...
Gas-fed CO2 electrochemical flow reactors are appealing platforms for the electrolytic conversion of into fuels and chemical feedstocks at commercially relevant current densities (≥100 mA/cm2). An inherent challenge in development these is delivering sufficient water to cathode sustain reduction reaction, while also preventing accumulation excess porous (i.e., flooding). We present herein experimental evidence showing flooding a zero-gap electrolyzer 200 mA/cm2. This causes 37% decrease...
The deployment of electrolyzers that convert CO2 into chemicals and fuels requires appropriate integration with upstream carbon capture processes. To this end, the electrolytic conversion aqueous (bi)carbonate offers opportunity to avoid energy-intensive steps currently used extract pressurized from solutions. We demonstrate here an optimized silver gas diffusion electrode (GDE) architecture enables model solutions (i.e., 3 M KHCO3) CO at partial current densities (JCO) greater than 100 mA...