A5061624173- Advanced Photocatalysis Techniques
- Copper-based nanomaterials and applications
- Electrocatalysts for Energy Conversion
- ZnO doping and properties
- Iron oxide chemistry and applications
- Quantum Dots Synthesis And Properties
- Gas Sensing Nanomaterials and Sensors
- Perovskite Materials and Applications
- Catalytic Processes in Materials Science
- TiO2 Photocatalysis and Solar Cells
- Ammonia Synthesis and Nitrogen Reduction
- Polyoxometalates: Synthesis and Applications
- Layered Double Hydroxides Synthesis and Applications
- CO2 Reduction Techniques and Catalysts
- Ga2O3 and related materials
- Fuel Cells and Related Materials
- Advanced battery technologies research
- Bone Tissue Engineering Materials
- Graphene research and applications
- biodegradable polymer synthesis and properties
- Catalysis and Oxidation Reactions
- Multiferroics and related materials
- Nanomaterials for catalytic reactions
- Advanced Battery Materials and Technologies
- Conducting polymers and applications
Ulsan National Institute of Science and Technology
2015-2025
Government of the Republic of Korea
2019-2020
Helmholtz-Zentrum Berlin für Materialien und Energie
2015-2019
Solar Fuels Institute
2015-2019
Boston College
2014-2017
Chestnut Hill College
2015-2016
Pohang University of Science and Technology
2007-2014
Advanced Engineering (Czechia)
2012
Pukyong National University
2003
A hematite photoanode showing a stable, record-breaking performance of 4.32 mA/cm2 photoelectrochemical water oxidation current at 1.23 V vs. RHE under simulated 1-sun (100 mW/cm2) irradiation is reported. This photocurrent corresponds to ca. 34% the maximum theoretical limit expected for with band gap 2.1 V. The produced stoichiometric hydrogen and oxygen gases in amounts close values from photocurrent. hematitle has unique single-crystalline "wormlike" morphology by in-situ two-step...
A monoclinic BiVO4 lattice was doped with phosphate to enhance photoelectrochemical and photocatalytic water oxidation activity under visible light by a factor of about 30 compared pristine BiVO4. Electrochemical impedance spectroscopy measurements density functional calculations revealed that much improved charge transfer characteristics are mainly responsible for the greatly enhanced activity. Detailed facts importance specialist readers published as "Supporting Information". Such...
Abstract Metal oxide semiconductors are promising photoelectrode materials for solar water splitting due to their robustness in aqueous solutions and low cost. Yet, solar-to-hydrogen conversion efficiencies still not high enough practical applications. Here we present a strategy enhance the efficiency of metal oxides, hetero-type dual photoelectrodes, which two photoanodes different bandgaps connected parallel extended light harvesting. Thus, photoelectrochemical device made modified BiVO 4...
Tantalum oxynitride photoanode is fabricated and modified with calcium ferrite to form a heterojunction anode for photoelectrochemical water splitting cell. The synthesized powders are loaded sequentially the transparent conducting glass by electrophoretic deposition, which advantageous uniform layer junction structure. X-ray diffraction, UV–vis diffuse reflectance spectroscopy, scanning electron microscopy, impedance spectroscopy analysis conducted investigate structural, morphological,...
Abstract The most efficient electrocatalyst for the hydrogen evolution reaction (HER) is a Pt‐based catalyst, but its high cost and nonperfect efficiency hinder wide‐ranging industrial/technological applications. Here, an of both ruthenium (Ru) single atoms (SAs) N‐doped‐graphitic(G N )‐shell‐covered nitrided‐Ru nanoparticles (NPs) (having Ru‐N x shell) embedded on melamine‐derived G matrix { 1 : [Ru(SA)+Ru(NP)@RuN @G ]/G }, which exhibits superior HER activity in acidic basic media,...
A 1D ZnFe<sub>2</sub>O<sub>4</sub> photoanode is treated under a hydrogen or vacuum atmosphere to improve the photoelectrochemical water oxidation activity up 20 times. This post-treatment creates oxygen vacancies in lattice that serve as source of electron donors and passivates surface trap sites, result improves charge transfer.
Probing the surface kinetics of different hematite electrodes with and without passivations.
Abstract The last few decades’ extensive research on the photoelectrochemical (PEC) water splitting has projected it as a promising approach to meet steadily growing demand for cleaner and renewable energy in sustainable economically viable fashion. Among many potential photocatalysts, hematite (α‐Fe 2 O 3 ) emerges highly photoanode material with favorable characteristics including visible light absorption (a suitable band gap energy), earth abundance, chemical stability, low cost. A...
Considering their superior charge-transfer characteristics, easy tenability of energy levels, and low production cost, organic semiconductors are ideal for photoelectrochemical (PEC) hydrogen production. However, organic-semiconductor-based photoelectrodes have not been extensively explored PEC water-splitting because stability in water. Herein, we report high-performance stable organic-semiconductors photoanodes consisting p-type polymers n-type non-fullerene materials, which is passivated...
Electrocatalytic nitrate reduction reaction (NO
We report the synthesis of carbon-doped zinc oxide nanostructures using vitamin C, and their visible light photocatalytic activity. Amorphous/crystalline C–ZnO (VitC–ZnO) structures were obtained from a solution nitrate hexahydrate, HMT, C through heating at 95 °C for 1 h. VitC–ZnO calcined in air 500 2 h to create C-doped ZnO nanostructures. Calcined polycrystalline, with an average crystal domain size 7 nm. EDS, XPS, XRD analysis revealed substitution oxygen carbon formation Zn–C bonds The...
We report a method for synthesizing three distinct type II 3D ZnO/ZnSe heterostructures through simple solution-based surface modification reactions in which polycrystalline ZnSe nanoparticles formed on the surfaces of single-crystalline ZnO building blocks superstructures. The experimental results suggested possible formation mechanism these heterostructures. was assumed to result from dissolution-recrystallization mechanism. optical properties were probed by UV-vis diffuse reflectance...
We have studied the precursor effects of citric acid and various citrates—including triethyl citrate, tripotassium trisodium citrate triammonium citrate—on formation ZnO crystals in alkaline solution. These citrate-related chemicals could be divided into three groups (group A, citrate; group B, C, citrate) based on their activity for modifying growth direction solution pH dependency concentration. obtain structures with distinct morphologies by simply changing concentration or additive...
Photoelectrochemical (PEC) water splitting to hydrogen is an attractive method for capturing and storing the solar energy in form of chemical energy. Metal oxides are promising photoanode materials due their low-cost synthetic routes higher stability than other semiconductors. In this paper, we provide overview recent efforts improve PEC efficiencies via applying a variety fabrication strategies metal oxide photoanodes including (i) size morphology-control, (ii) heterostructuring, (iii)...
Transition metal nitrides of group 4–6 (Mo2N, W2N, NbN, Ta3N5, and TiN) were synthesized by the urea-glass route screened for oxygen reduction reaction (ORR) electrodes in PEMFCs. In terms electrochemical stability activity, TiN was selected as most promising candidate a catalyst ORR. To further enhance activity ORR, modified with nanostructured carbon supports including CNTs, graphene (GR), CNT–GR hybrid. The obtained nanocarbon-supported catalysts exhibited small particle sizes (<7 nm)...
Abstract Widespread application of solar water splitting for energy conversion is largely dependent on the progress in developing not only efficient but also cheap and scalable photoelectrodes. Metal oxides, which can be deposited with techniques are relatively cheap, particularly interesting, high efficiency still hindered by poor carrier transport properties (i.e., mobility lifetime). Here, a mild hydrogen treatment introduced to bismuth vanadate (BiVO 4 ), one most promising metal oxide...
A bismuth vanadate photoanode was first fabricated by the metal–organic decomposition method and particles of calcium ferrite were electrophoretically deposited to construct a heterojunction photoanode. The characteristics photoanodes investigated in photoelectrochemical water oxidation under simulated 1 sun (100 mW cm–2) irradiation. Relative pristine BiVO4 anode, formation structure CaFe2O4/BiVO4 increased photocurrent density about 60%. effect on transfer charge carriers using hydrogen...
A stable and efficient hematite photoanode that works for solar water splitting, even in a neutral electrolyte, is developed by surface modification with phosphate ions. By preventing performance stability degradation the current method provides an effective path to engineering of photoelectrodes employ any electrolyte choice. As service our authors readers, this journal supporting information supplied authors. Such materials are peer reviewed may be re-organized online delivery, but not...
Although cadmium chalcogenide quantum dot-sensitized photoanode can utilize the whole visible region of solar spectrum, its poor photochemical stability owing to hole-induced anodic corrosion remains a major problem for application in photoelectrochemical hydrogen generation systems. Here, modification with IrOx·nH2O, well-known water-oxidation catalyst substantially improves photoanode. Moreover, it induces an increased photocurrent and cathodic shift onset potential. This is first example...