A5077647460- Advanced Photocatalysis Techniques
- TiO2 Photocatalysis and Solar Cells
- Copper-based nanomaterials and applications
- Electrocatalysts for Energy Conversion
- Catalytic Processes in Materials Science
- CO2 Reduction Techniques and Catalysts
- Perovskite Materials and Applications
- Advanced battery technologies research
- Ga2O3 and related materials
- 2D Materials and Applications
- Quantum Dots Synthesis And Properties
- Solar-Powered Water Purification Methods
- Gas Sensing Nanomaterials and Sensors
- Advanced Nanomaterials in Catalysis
- Ammonia Synthesis and Nitrogen Reduction
- Electronic and Structural Properties of Oxides
- Catalysis and Oxidation Reactions
- Fuel Cells and Related Materials
Yonsei University
2017-2024
Abstract As the development of oxygen evolution co-catalysts (OECs) is being actively undertaken, tailored integration those OECs with photoanodes expected to be a plausible avenue for achieving highly efficient solar-assisted water splitting. Here, we demonstrate that black phosphorene (BP) layer, inserted between OEC and BiVO 4 can improve photoelectrochemical performance pre-optimized OEC/BiVO (OEC: NiOOH, MnO x, CoOOH) systems by 1.2∼1.6-fold, while overlayer, in turn, suppress BP...
Abstract Millions of families around the world remain vulnerable to water scarcity and have no access drinking water. Advanced oxidation processes (AOPs) are an effective way towards purification with qualified reactive oxygen species (ROSs) while impeded by high-cost tedious process in either input consumable reagent, production ROSs, pre-treatment supporting electrolyte. Herein, we couple solar light-assisted H 2 O from photo-Fenton-like reactions into a self-cyclable system using...
Abstract Oxygen vacancies have been treated as an important material engineering tool to enhance catalytic performance; for instance, oxygen suppress charge recombination at the Schottky interface, and thus, photocurrent can be improved. In this regard, gradient distribution of in n‐type metal oxides produces ideal band structure minimizing e − /h + by efficient hole extraction; however, its achievement remains a daunting challenge. Here, photoelectrochemical (PEC)‐driven “self‐purification”...
Cu is a key element for many photo- and electro-driven catalyst systems, but it readily undergoes natural oxidation in air electron-mediated support interactions when contact with reducible oxides. The production of value-added hydrocarbons via photocatalytic CO2 reduction promising, remains an unresolved challenge due to the hurdles associated controlling valence state cocatalyst within heterogeneous composite formed as result oxidative stabilization during nucleation process. Herein, we...
A two-photon tandem absorption E-BiVO 4 /BPQDs/OL-OEC photoanode with superior light absorbability and photocurrent density.
Abstract Due to the greenhouse effect, enormous efforts are done for carbon dioxide reduction. By contrast, more attention should be paid methane oxidation and conversion, which can help effective utilization of without emission. However, conversion under ambient conditions remains a challenge. Here, this study designs Co 3 O 4 /ZrO 2 nanocomposite electrochemical gas using carbonate electrolyte at room temperature. activated highly efficient mild electric energy with as an oxidant, is...
Water oxidation kinetics has been identified as the bottleneck of solar water splitting reaction for H2 production. Herein, we demonstrate that even crystal facets with same thermodynamically favorable pathway oxidation, interfacial energetics formed by terminated facet/electrolyte interface can significantly regulate to tune product selectivity. Specifically, elucidate (010) facet BiVO4 photoanode offer suitable band bending and deep valence level produce high-value-added hydrogen peroxide...
Abstract Among the substantial amount of photocatalyst materials, TiO 2 has been enthusiastically studied for a few decades due to its outstanding photocatalytic activity and stability. Recently, black consisting approximately nm thin disorder layer around surface showed surprisingly high solar hydrogen generation ability. The can enhance light absorption, charge separation, reaction abilities, however exact fundamentals water‐splitting pathways are still ambiguous. Herein, recent progress...
Despite a longstanding controversy surrounding TiO2 materials, polymorphs with heterojunctions composed of anatase and rutile outperform individual because the type-II energetic band alignment at heterojunction interface. Improvement in photocatalysis has also been achieved via black thin disorder layer ordered TiO2. However, localization this conventional single nanoparticle remained big challenge. Here, we report selective positioning controlled thicknesses between phases by conceptually...
Abstract A surface disordered layer is a plausible approach to improve the photoelectrochemical performance of TiO 2 . However, formation crystalline in BiVO 4 and its effectiveness towards water splitting has remained big challenge. Here, we report rapid solution process (within 5 s) that able form few nanometers thick on nanoparticles using specific with controllable reducing power. The alleviates charge recombination at electrode–electrolyte interface reduces onset potential greatly,...
In heterogeneous catalysts, metal-oxide interactions occur spontaneously but often in an undesired way leading to the oxidation of metal nanoparticles. Manipulating such produce highly active surface nanoparticles can warrant optimal catalytic activity has not been established date. Here we report that a prior reduced TiO2 support reverse interaction with Pt and augment metallic state Pt, exhibiting 3-fold increase hydrogen production rate compared conventional Pt/TiO2. Spatially resolved...
We have developed a one-pot solvothermal strategy for single-atom catalyst synthesis (M = Mo, W, Nb) with M–O x –C moieties effective H 2 O production via two-electron oxygen reduction reaction.
Abstract Mesoporous TiO 2 nanoparticle (NP) films are broadly used as electrodes in photoelectrochemical cells, dye‐sensitized solar cells (DSSCs), and perovskite (PSCs). State‐of‐the‐art mesoporous NP for these fabricated by annealing paste‐coated fluorine‐doped tin oxide glass a box furnace at 500 °C ≈30 min. Here, the use of nontraditional reactor, i.e., flame, is reported high throughput ultrafast paste (≈1 min). This flame‐annealing method, compared to conventional annealing, exhibits...
Hydrogen generation by water electrolysis has been comprehensively studied for several decades, although it still faces many difficulties in commercialization due to low efficiency. Even though IrO 2 and RuO have superior activities oxygen evolution reaction (OER), such novel metal catalysts need high overpotential compared hydrogen reaction. To overcome the limitation of OER, former researches with various materials which are cheaper perform better than metal-based electrocatalysts. Among...
Despite longstanding controversy, TiO 2 polymorphs heterojunction composed of anatase and rutile outperform the individual ones because energetic type-II band alignment at interface. Apart from conventional interface, surface disordered has been drawing interest considered as an unpredictable strategy while is regarded a fact for dramatically enhancing photocatalytic activity. However, introduction localization layer within nanoparticles with remained big challenge. Here we report selective...