A5089265918- Advanced Photocatalysis Techniques
- CO2 Reduction Techniques and Catalysts
- TiO2 Photocatalysis and Solar Cells
- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Fuel Cells and Related Materials
- Electrochemical Analysis and Applications
- Catalytic Processes in Materials Science
- Nanoplatforms for cancer theranostics
- Electrowetting and Microfluidic Technologies
- Quantum Dots Synthesis And Properties
- Membrane-based Ion Separation Techniques
- solar cell performance optimization
- Gold and Silver Nanoparticles Synthesis and Applications
- Supercapacitor Materials and Fabrication
- Nanoparticle-Based Drug Delivery
- Gas Sensing Nanomaterials and Sensors
- Water Quality Monitoring and Analysis
- Analytical Chemistry and Sensors
- Molecular Junctions and Nanostructures
- Microfluidic and Bio-sensing Technologies
- Lipid Membrane Structure and Behavior
- Renal function and acid-base balance
- Advanced Battery Materials and Technologies
- Advanced Nanomaterials in Catalysis
University of Pennsylvania
2020-2025
California University of Pennsylvania
2024
Pennsylvania State University
2018
Hunan University
2017
Photothermal therapy (PTT) has been extensively developed as an effective approach against cancer. However, PTT can trigger inflammatory responses, in turn simulating tumor regeneration and hindering subsequent therapy. A therapeutic strategy was to deliver enhanced simultaneously inhibit PTT-induced response. 1-Pyrene methanol utilize synthesize the anti-inflammatory prodrug pyrene-aspirin (P-aspirin) with a cleavable ester bond also facilitate loading on gold nanorod (AuNR)-encapsulated...
Efficient and stable photoelectrochemical reduction of CO2 into highly reduced liquid fuels remains a formidable challenge, which requires an innovative semiconductor/catalyst interface to tackle. In this study, we introduce strategy involving the fabrication silicon micropillar array structure coated with superhydrophobic fluorinated carbon layer for conversion methanol. The pillars increase electrode surface area, improve catalyst loading adhesion without compromising light absorption,...
We report a precious-metal-free molecular catalyst-based photocathode that is active for aqueous CO2 reduction to CO and methanol. The photoelectrode composed of cobalt phthalocyanine molecules anchored on graphene oxide which integrated via (3-aminopropyl)triethoxysilane linker p-type silicon protected by thin film titanium dioxide. reduces with high selectivity at potentials as mild 0 V versus the reversible hydrogen electrode (vs RHE). Methanol production observed an onset potential -0.36...
While dye-sensitized metal oxides are good candidates as H 2 evolution photocatalysts for solar-driven Z-scheme water splitting, their solar-to-hydrogen (STH) energy conversion efficiencies remain low because of uncontrolled charge recombination reactions. Here, we show that modification Ru dye–sensitized, Pt-intercalated HCa Nb 3 O 10 nanosheets ( /Pt/HCa ) with both amorphous Al and poly(styrenesulfonate) (PSS) improves the STH efficiency overall splitting by a factor ~100, when used in...
While redox polymer-mediated catalysis at silicon photoelectrodes has been studied since the 1980s, there have few detailed studies of these materials in photoelectrochemical CO2 reduction. Here, we develop functionalized with a viologen-based polymer that mediates formation catalytic gold nanoparticles. The presence was confirmed by X-ray photoelectron spectroscopy (XPS), and nanoparticles were imaged high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). We...
Aqueous redox flow batteries that employ organic molecules as couples hold great promise for mitigating the intermittency of renewable electricity through efficient, low-cost diurnal storage. However, low cell potentials and sluggish ion transport often limit achievable power density. Here, we explore bipolar membrane (BPM)-enabled acid-base in which positive negative electrodes operate alkaline acidic electrolytes, respectively. This new configuration adds potential arising from pH...
In water-splitting dye-sensitized photoelectrochemical cells (WS-DSPECs), charge recombination competes with catalytic water oxidation to determine the overall efficiency of system. The kinetics these processes have been difficult understand because transient absorbance (TA) experiments typically show nearly complete on submillisecond time scale; in contrast, electrochemical measurements such as open circuit photovoltage decay suggest a scale that is 2–3 orders magnitude longer. Here we...
Photoelectrodes consisting of metal–insulator–semiconductor (MIS) junctions are a promising candidate architecture for water splitting and the CO2 reduction reaction (CO2RR). The photovoltage is an essential indicator driving force that photoelectrode can provide surface catalytic reactions. However, MIS photoelectrodes contain metal nanoparticles, direct measurements at sites under operational conditions remain challenging. Herein, we report new in situ spectroscopic approach to probe...
Anion-exchange membrane fuel cells represent a promising and scalable approach for hydrogen energy utilization. However, their development is hindered by the weak bonding between metal catalysts carbon supports, along with challenges in fabricating electronically/ionically conductive electrodes. Here, we report composite cathode of Nb-doped brookite TiO2 nanorods that have robust stability when combined Pt nanoscale an alkaline cell. The cathode, fabricated without addition ionomer, delivers...
Abstract Photothermal therapy (PTT) has been extensively developed as an effective approach against cancer. However, PTT can trigger inflammatory responses, in turn simulating tumor regeneration and hindering subsequent therapy. A therapeutic strategy was to deliver enhanced simultaneously inhibit PTT‐induced response. 1‐Pyrene methanol utilize synthesize the anti‐inflammatory prodrug pyrene–aspirin (P‐aspirin) with a cleavable ester bond also facilitate loading on gold nanorod...
Abstract A molecularly thin layer of 2‐aminobenzenethiol (2‐ABT) was adsorbed onto nanoporous p‐type silicon (b‐Si) photocathodes decorated with Ag nanoparticles (Ag NPs). The addition 2‐ABT alters the balance CO 2 reduction and hydrogen evolution reactions, resulting in more selective efficient to CO. adsorbate characterized by Fourier transform infrared (FTIR) spectroscopy modeled density functional theory calculations. Ex situ X‐ray photoelectron (XPS) modified electrodes suggests that...
The dynamics of photoinduced electron transfer were measured at dye-sensitized photoanodes in aqueous (acetate buffer), nonaqueous (acetonitrile), and mixed solvent electrolytes by nanosecond transient absorption spectroscopy (TAS) ultrafast optical-pump terahertz-probe (OPTP). Higher injection efficiencies found for SnO
Bipolar membranes (BPMs) are interesting materials for the development of next-generation electrochemical energy conversion and separations processes. One key challenges in optimizing BPM performance is enhancing rate water dissociation (WD) reaction. While electric field effects, specifically second Wien effect, have been demonstrated to enhance WD reaction, making BPMs with low overpotentials using primary effects has difficult achieve. In this study, we constructed an abrupt interfacial...
Abstract A soft lithographic method is developed for making bipolar membranes (BPMs) with catalytic junctions formed from arrays of vertically oriented microscale cylinders. The are cast reusable polydimethylsiloxane (PDMS) molds made silicon masters, which fabricated on 2″ to 4″ wafer scales by nanosphere lithography. High‐aspect‐ratio a length scale similar the thickness optimized catalyst layers water dissociation, creating platform probing dual effects catalysis and local electric field...
Pt‐intercalated calcium niobate nanosheets (Pt/HCa 2 Nb 3 O 10 ) sensitized by a Ru(II) complex dye are good photocatalysts for producing H from aqueous solutions containing I − as reversible electron donor. These materials applicable to Z‐scheme overall water splitting in combination with WO ‐based ‐evolving photocatalyst under simulated sunlight. In this work, the effects of anionic polymer modification dye‐sensitized examined adsorbing sodium poly(styrenesulfonate) (PSS), polyacrylate,...
Self-powered, biocompatible pumps in the nanometer to micron length scale have potential enable technology several fields, including chemical analysis and medical diagnostics. Chemically powered, catalytic micropumps been developed but are not able function well environments due their intolerance of salt solutions use toxic fuels. In contrast, enzymatically powered offer good biocompatibility, selectivity, scalability, performance at scales below a few millimeters, which is important many...
In aqueous electrolytes, dye-sensitized oxide semiconductors provide a visible light-absorbing photoanode that can be coupled to various cathodes for solar fuel production. Understanding the kinetics of electron transfer processes in these photoanodes is important improving system efficiency. Array electrodes consisting vertically aligned, crystalline TiO2 nanowires have been developed conventional, nonaqueous dye cells accelerate transport between electrode/electrolyte interface, where...
Abstract A molecularly thin layer of 2‐aminobenzenethiol (2‐ABT) was adsorbed onto nanoporous p‐type silicon (b‐Si) photocathodes decorated with Ag nanoparticles (Ag NPs). The addition 2‐ABT alters the balance CO 2 reduction and hydrogen evolution reactions, resulting in more selective efficient to CO. adsorbate characterized by Fourier transform infrared (FTIR) spectroscopy modeled density functional theory calculations. Ex situ X‐ray photoelectron (XPS) modified electrodes suggests that...
Abstract We report a precious‐metal‐free molecular catalyst‐based photocathode that is active for aqueous CO 2 reduction to and methanol. The photoelectrode composed of cobalt phthalocyanine molecules anchored on graphene oxide which integrated via (3‐aminopropyl)triethoxysilane linker p‐type silicon protected by thin film titanium dioxide. reduces with high selectivity at potentials as mild 0 V versus the reversible hydrogen electrode (vs RHE). Methanol production observed an onset...
The dynamics and efficiency of photoinduced electron transfer were measured at dye-sensitized photoanodes in aqueous (acetate buffer), nonaqueous (acetonitrile), mixed solvent electrolytes by nanosecond transient spectroscopy (TAS) ultrafast optical-pump terahertz-probe (OPTP). Higher injection efficiencies found for SnO2/TiO2 core/shell electrodes, whereas the TiO2 electrodes decreased with increasing acetonitrile concentration. trend was consistent solvent-dependent semiconductor flat-band...
Water Splitting In article number 2300629, Mallouk, Maeda and co-workers report that a surface modification of dye-sensitized calcium niobate nanosheet photocatalyst with anionic polymers such as sodium polymethacrylate improves the activity for solar water splitting, giving maximum solar-to-hydrogen energy conversion efficiency 0.12±0.01% an apparent quantum yield 5.1% at 420 nm.