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Introduction
One postdoc position is available in my group to work on the development of novel electrocatalysts for the reduction of CO2.
Additional affiliations
February 2016 - present
January 2011 - February 2016
November 2007 - October 2010
Publications
Publications (98)
Large-scale, high-quality growth of transition metal dichalcogenides (TMD) of controlled thicknesses is paramount for many applications in opto- and microelectronics. This paper describes the direct growth of well-controlled large area...
Two-dimensional (2D) materials, as adsorbents, have garnered great attention in removing heavy metal ions (HMIs) from drinking water due to their extensive exposed adsorption sites. Nevertheless, there remains a paucity of experimental research to remarkably unlock their adsorption capabilities and fully elucidate their adsorption mechanisms. In th...
Capacitive deionization (CDI) has emerged as a promising technology for freshwater recovery from low‐salinity brackish water. It is still inapplicable in specific scenarios (e.g., households, islands, or offshore platforms) due to too low volumetric adsorption capacities. In this study, a high‐density semi‐metallic molybdenum disulfide (1Tʹ‐MoS2) e...
Intercalation of atoms, ions and molecules is a powerful tool for altering or tuning the properties — interlayer interactions, in-plane bonding configurations, Fermi-level energies, electronic band structures and spin–orbit coupling — of 2D materials. Intercalation can induce property changes in materials related to photonics, electronics, optoelec...
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The formation of (bi)carbonate in alkaline and neutral membrane-electrode assembly (MEA) electrolyzers poses an unsatisfactorily low upper-bound of CO 2 single-pass utilization rate (SPU) and single-pass conversion rate (SPC) in CO 2 electrolyzers. Electrolyzing CO 2 in acidic MEA has been regarded as an effective strategy to prevent carbonate form...
Raman spectroscopy is a widely used technique to characterize nanomaterials because of its convenience, non-destructiveness, and sensitivity to materials change. The primary purpose of this work is to determine via Raman spectroscopy the average thickness of MoS 2 thin films synthesized by direct liquid injection pulsed-pressure chemical vapor depo...
VAT photopolymerization technology was applied to fabricate three-dimensional (3D) porous β-Ca2SiO4 ceramic scaffolds functionalized with graphene oxide (GO) sheets decorated with silver nanoparticles (AgNPs). We achieved this by utilizing commercial resin blends and “customized” resin both loaded with CaCO3 particles. The dual functionality of the...
Although progress has been made in producing multi-carbon products from the electrochemical reduction of CO2, the modest selectivity for ethylene (C2H4) leads to low energy efficiency and high downstream separation costs. Here we functionalize Cu catalysts with a variety of substituted aryl diazonium salts to improve selectivity towards multi-carbo...
Ultra-thin 2D Fe-SACs synthesized via a pyrolysis process using a salt template, exhibit high activity for the electrochemical nitrate reduction reaction. Solar cells integrated with 2D Fe-SACs hold great promise for green ammonia production and nitrate removal from water bodies.
Addressing the limitations arising from the consistent catalytic behavior observed for various intermediates during the electrochemical carbon dioxide reduction reaction (CO2RR) poses a significant challenge in the optimization of catalytic activity. In this study, we aimed to address this challenge by constructing an asymmetric coordination Fe sin...
Addressing the limitations arising from the consistent catalytic behavior observed for various intermediates during the electrochemical carbon dioxide reduction reaction (CO2RR) poses a significant challenge in the optimization of catalytic activity. In this study, we aimed to address this challenge by constructing an asymmetric coordination Fe sin...
Atomically thin sheets (e.g., graphene and monolayer molybdenum disulfide) are ideal optical and reaction platforms. They provide opportunities for deciphering some important and often elusive photocatalytic phenomena related to electronic band structures and photo-charges. In parallel, in such thin sheets, fine tuning of photocatalytic properties...
The development of highly selective and energy efficient technologies for electrochemical CO 2 reduction combined with renewable energy sources holds great promise for advancing the field of sustainable chemistry. The engineering of copper-based electrodes provides a pathway for the conversion of CO 2 into high-value multicarbon products (C 2+ ). H...
Li-based batteries are currently the most widely used energy storage technology in electric vehicles and portable electronic devices, but discarded batteries represent a growing environmental hazard. The flammability of the liquid electrolyte particularly requires exploration of alternative recycling methods. Herein, we report the photochemical con...
Carbon and nitrogen fixation strategies are regarded as alternative routes to produce valuable chemicals used as energy carriers and fertilizers that are traditionally obtained from unsustainable and energy-intensive coal gasification (CO and CH 4), Fischer−Tropsch (C 2 H 4), and Haber−Bosch (NH 3) processes. Recently, the electrocatalytic CO 2 red...
The electroreduction of CO2 has recently achieved notable progress in the formation of C2 products such as ethylene and ethanol. However, the direct synthesis of C3 products is considerably limited by the C2–C1 coupling reaction and the faradaic efficiency has remained low. Here we present a supersaturation strategy for the electrosynthesis of 2-pr...
The intercalation-based exfoliation of layered materials is a broadly applicable strategy for the scalable production of atomically thin (from mono- to few-layer) sheets, including graphene, black phosphorus, hexagonal boron nitride and transition metal dichalcogenides. This strategy typically involves the intercalation of foreign species (ions or...
Stacking two-dimensional nanosheets into laminar membranes to create nanochannels has attracted widespread attention at both fundamental and practical levels in separation technology. Constructing space-tunable and long-term stable sub-nanometre channels provides original systems for nanofluidic investigations and accurate molecular sieving. Here w...
Two‐dimensional (2D) transition metal dichalcogenides (TMDs), a rising star in the post‐graphene era, are fundamentally and technologically intriguing for photocatalysis. Their extraordinary electronic, optical, and chemical properties endow them as promising materials for effectively harvesting light and catalyzing the redox reaction in photocatal...
Two‐dimensional (2D) transition metal dichalcogenides (TMDs), a rising star in the post‐graphene era, are fundamentally and technologically intriguing for photocatalysis. Their extraordinary electronic, optical, and chemical properties endow them as promising materials for effectively harvesting light and catalyzing the redox reaction in photocatal...
This study describes the fabrication of an aflatoxin (AFB1) electrochemical immunosensor by immobilization of an anti-AFB1 antibody-bovine serum albumin (BSA) conjugate on a layer of L-cysteine (L-Cys) used to link the antibody to the palladium nanoparticle-boron nitride (PdNP-BN)-modified carbon felt (CF) electrode. Each step of the immunosensor f...
Designing highly ordered and ultrathin nanoporous membranes achieves superior water flux, while maintaining high selectivity for NaCl rejection.
Transition metal dichalcogenides (TMDs) membranes exhibit good anti‐swelling properties but poor water desalination property. Here, we report a one‐step covalent functionalization of MoS2 nanosheets for membrane fabrication, which was accomplished by simultaneous exfoliating and grafting the lithium ion intercalated MoS2 in organic iodide water sol...
Solar‐to‐Ammonia Efficiency
In article 2108316, Damien Voiry and co‐workers report a single atom catalyst based on iron single atoms supported on 2D MoS2 nanosheets. The catalyst demonstrates near‐unity selectivity for the electrosynthesis of ammonia with a solar‐to‐NH3 efficiency of 3.4% when coupled to an external InGaP/GaAs/Ge triple‐junction so...
Transition metal dichalcogenide (TMD) nanomaterials, especially the mono- or few-layer ones, have received extensive research interest owing to their versatile properties, ranging from true metals (e.g., NbS2 and VSe2) and semimetals (e.g., WTe2 and TiSe2) to semiconductors (e.g., MoS2 and We2) and insulators (e.g., HfS2). Therefore, the reliable p...
Electrochemical synthesis of NH 3 is a carbon-free alternative to the traditional Haber-Bosch process. Obtaining NH 3 from environmental pollutants, such as nitrates or nitrites, is a more practical route than from the nitrogen reduction reaction (NRR) due to the difficult cleavage of the inert triple bond of nitrogen gas. Here, a novel heterogeneo...
The conversion of CO 2 into desirable multicarbon products via the electrochemical reduction reaction holds promise to achieve a circular carbon economy. Here, we report a strategy in which we modify the surface of bimetallic silver-copper catalyst with aromatic heterocycles such as thiadiazole and triazole derivatives to increase the conversion of...
Electrochemical synthesis of NH 3 is a carbon-free alternative to the traditional Haber-Bosch process. The challenge with nitrogen reduction reaction (NRR) to NH 3 is cleavage of the inert N≡N triple bond of nitrogen gas. Obtaining NH 3 from environmental pollutants, such as nitrates or nitrites, is a more practical route than NRR. However, reducti...
The conversion of CO 2 into desirable multicarbon products such as ethylene and ethanol via the carbon dioxide reduction reaction (CO 2 RR) hold promise to achieve a circular carbon economy. The develop of such a technology is currently hampered by the lack of catalysts, which can drive the reaction at industrially relevant current densities with h...
The electrochemical reduction of CO 2 in a highly selective and efficient manner is a crucial step toward its reuse for the production of chemicals and fuels. Nanostructured Ag catalysts have been found to be effective candidates for the conversion of CO 2-to-CO. However, the ambiguous determination of the intrinsic CO 2 activity and the maximizati...
Hydrogen Evolution Reaction (HER) is an attractive technology for chemical conversion of energy. Replacement of platinum with inexpensive and stable electrocatalysts remains a major bottleneck hampering large-scale hydrogen production by using clean and renewable energy sources. Here, we report electrocatalytically active and ultra-stable Polymer-D...
Enzymes are biological catalysts that are interesting for key reactions such as hydrogen evolution, CO 2 conversion into hydrocarbons and the fixation of nitrogen. Enzymes are particularly good catalysts for organic reactions because of their high selectivity. However, they exhibit modest stability and require extensive purification, which makes th...
Single-atom catalysts (SACs) have recently attracted interest in the fields of heterogeneous catalysis and electrocatalysis due to the enhancement in intrinsic activity and selectivity through optimized exposure of the active sites. Synthesis of SACs and research into their behavior have helped to elucidate the kinetics and thermodynamics of severa...
Developing highly active nonprecious‐metal catalysts for the oxygen reduction reaction (ORR) is of great significance for reducing the cost of fuel cells. 3D‐ordered porous structures could substantially improve the performance of the catalysts because of their excellent mass‐diffusion properties and high specific surface areas. Herein, ordered por...
Metallic transition metal dichalcogenides (TMDs)1–8 are good catalysts for the hydrogen evolution reaction (HER). The overpotential and Tafel slope values of metallic phases and edges⁹ of two-dimensional (2D) TMDs approach those of Pt. However, the overall current density of 2D TMD catalysts remains orders of magnitude lower (~10–100 mA cm⁻²) than...
Nanolaminate membranes made of two-dimensional materials such as graphene oxide are promising candidates for molecular sieving via size-limited diffusion in the two-dimensional capillaries, but high hydrophilicity makes these membranes unstable in water. Here, we report a nanolaminate membrane based on covalently functionalized molybdenum disulfide...
Single atom catalysts provide exceptional activity. However, measuring the intrinsic catalytic activity of a single atom in real electrochemical environments is challenging. Here, we report the activity of a single sulfur vacancy for electrocatalytically evolving hydrogen in two dimensional (2D) MoS2. Surprisingly, we find that the catalytic activi...
Low-dimensional materials and their hybrids have emerged as promising candidates for electrocatalytic and photocatalytic hydrogen evolution and CO2 conversion into useful molecules. Progress in synthetic methods for the production of catalysts coupled with a better understanding of the fundamental catalytic mechanisms has enabled the rational desig...
Using transient absorption spectroscopy, we observe the formation of long-lived charge transfer states in polymer:fullerene – MoS2 van der Waals heterostructures at sub-picosecond timescales.
Crystalline and amorphous transition metal chalcogenides such as MoS2 are currently recognized as state-of-the-art non-precious transition metal catalysts for the hydrogen evolution reaction (HER). Nevertheless, despite numerous studies dedicated to their electrocatalytic activities, the exact nature of the active sites as well as their interaction...
We present a portable non-invasive approach for measuring indicators of inflammation and oxidative stress in the respiratory tract by quantifying a biomarker in exhaled breath condensate (EBC). We discuss the fabrication and characterization of a miniaturized electrochemical sensor for detecting nitrite content in EBC using reduced graphene oxide....
2D transition metal dichalcogenide MoS2 nanosheets are increasingly attracting interests due to their promising applications in materials science and biomedicine. However, their biocompatibility and their biodegradability have not been thoroughly studied yet. Here, the biodegradability of exfoliated pristine and covalently functionalized MoS2 (f-Mo...
We observed ultrafast hole transfer from monolayer MoS2 to a conjugated polymer using pump-probe measurements. We show that plasmonic metasurfaces lead to enhanced absorption in in the heterojunction, with a 90-nm absorption bandwidth increase.
Integration of organic/inorganic hybrid perovskites with metallic or semiconducting phases of 2D MoS2 nanosheets via solution processing is demonstrated. The results show that the collection of charge carriers is strongly dependent on the electronic properties of the 2D MoS2 with metallic MoS2 showing high responsivity and the semiconducting phase...
Hybrid organic-inorganic heterostructures are attracting tremendous attention for optoelectronic applications due to their low-cost processing and high performance in devices. In particular, van der Waals p-n heterjunctions formed between inorganic two-dimensional (2D) materials and organic semiconductors are of interest due to the quantum confinem...
Zinc Oxide (ZnO) and graphene (G) have been extensively studied because of their unique physical properties. Here, Graphene-Zinc Oxide (G/ZnO) nanolaminates were fabricated, respectively, by chemical vapor deposition and low temperature atomic layer deposition technique. The number of obtained G/ZnO layers was tuned from 1 to 11 with a total thickn...
Efficient exfoliation of graphite in solutions to obtain high-quality graphene flakes is desirable for printable electronics, catalysis, energy storage, and composites. Graphite oxide with large lateral dimensions has an exfoliation yield of ˜100% but it has not been possible to completely remove the oxygen functional groups so that the reduced for...
Single crystals of ReS2 (I) and ReSe2 (II) are grown by a modified Bridgman method from the constituent elements (evacuated quartz tubes, 1100 °C, 24 h; cooling to 900 °C at a rate of 1 °C/h).
In our quest to make various chemical processes sustainable, the development of facile synthetic routes and inexpensive catalysts can play a central role. Herein we report the synthesis of monodisperse, polyaniline (PANI)-derived mesoporous carbon nanoparticles (PAMCs) that can serve as efficient metal-free electrocatalysts for the hydrogen peroxid...
The excellent catalytic activity of metallic MoS2 edges for the hydrogen evolution reaction (HER) has led to substantial efforts towards increasing the edge concentration. The 2H basal plane is less active for the HER because it is less conducting and therefore possesses less efficient charge transfer kinetics. Here we show that the activity of the...
MoS2 is a promising candidate for electronic and optoelectronic applications. However, its application in light harvesting has been limited in part due to crystal defects, often related to small crystalline sizes, which diminish charge separation and transfer. Here we demonstrate a surface engineering strategy for 2D MoS2 to improve its photoelectr...
We report the synthesis of high-quality single crystals of ReS2 and ReSe2 transition metal dichalcogenides using a modified Bridgman method that avoids the use of a halogen transport agent. Comprehensive structural characterization using X-ray diffraction and electron microscopy confirm a distorted triclinic 1T′ structure for both crystals and reve...
In the recent context of emerging two-dimensional (2D) materials, a comprehensive set of spatially resolved photoelectron spectroscopic techniques providing information ranging from surface chemical states to electronic band structure must be available at the practical level (i.e. from laboratory-based instrumentation) for a better understanding of...
Two-dimensional (2D) transition-metal dichalcogenide (TMD) nanosheets have emerged as a fascinating new class of materials for catalysis. These nanosheets are active for several important catalysis reactions including hydrogen evolution from water. The rich chemistry of TMDs combined with numerous strategies that allow tuning of their electronic pr...
Significant interest has grown in the development of earth-abundant and efficient
catalytic materials for hydrogen generation. Layered transition metal dichalcogenides present
opportunities for efficient electrocatalytic systems. Here, we report the modification of 1D MoOx/
MoS2 core−shell nanostructures by lithium intercalation and the correspondi...
Two-dimensional (2D) transition-metal dichalcogenides (TMDs) consist of over 40 compounds. Complex metal TMDs assume the 1T phase where the transition-metal atom coordination is octahedral. The 2H phase is stable in semiconducting TMDs where the coordination of metal atoms is trigonal prismatic. Stability issues have hampered the study of interesti...
Hybrid nanostructured materials comprised amorphous carbon nanoneedles (CNN)-supported Co3O4 nanoparticles (Co3O4-CNN) were synthesized. The synthesis involved layer-by-layer nanocasting of cellulose nanowhiskers with cobalt oxide and silica precursors, followed by pyrolysis of the core-shell-shell composite materials and etching of the outer silic...
In the past few years, considerable effort has been devoted to the study of graphene as energy storage material for supercapacitors. More recently other 2D materials have emerged such as MXenes and transition metal dichalcogenides. In this study, chemically exfoliated and restacked nanosheets of metallic 1T phase MoS 2 has been introduced as a supe...
Transition metal dichalcogenides (TMDs) represent a family of materials with versatile electronic, optical, and chemical properties. Most TMD bulk crystals are van der Waals solids with strong bonding within the plane but weak interlayer bonding. The individual layers can be readily isolated. Single layer TMDs possess intriguing properties that are...
Efficient intercalation of ions in layered materials forms the basis of electrochemical energy storage devices such as batteries and capacitors. Recent research has focused on the exfoliation of layered materials and then restacking the two-dimensional exfoliated nanosheets to form electrodes with enhanced electrochemical response. Here, we show th...
Carbon dioxide (CO 2) is one of the main gases produced by human activity and is responsible for the green house effect. Numerous routes for CO 2 capture and reduction are currently under investigation. Another ap-proach to mitigate the CO 2 content in the atmosphere is to convert it into useful species such as hydrocarbon mole-cules that can be us...
Reduction of carbon nanohorn (CNH) aggregates by potassium naphthalenide resulted in their dismantling and individualization. Furthermore, the reduced CNHs were functionalized by addition of electrophiles.
Using renewable resources to make various synthetic materials is intensifying in order to meet some of our sustainability challenges. Yeast is one of the most common household ingredients, which is cheap and easy to reproduce. Herein we report that yeast cells can be thermally transformed into hollow, core-shell heteroatom-doped carbon microparticl...