A5103276108- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Catalytic Processes in Materials Science
- Advanced Photocatalysis Techniques
- TiO2 Photocatalysis and Solar Cells
- CO2 Reduction Techniques and Catalysts
- Catalysts for Methane Reforming
- Electrochemical Analysis and Applications
- Advanced Chemical Physics Studies
- Quantum Dots Synthesis And Properties
- Advancements in Battery Materials
- Fuel Cells and Related Materials
- Supercapacitor Materials and Fabrication
- Advanced Nanomaterials in Catalysis
- Copper-based nanomaterials and applications
- Advanced Battery Materials and Technologies
- Electron and X-Ray Spectroscopy Techniques
- Advanced Battery Technologies Research
- Catalysis and Oxidation Reactions
- Child Development and Digital Technology
- Diamond and Carbon-based Materials Research
- Ionic liquids properties and applications
- Laser-Matter Interactions and Applications
- COVID-19 and Mental Health
- Electronic and Structural Properties of Oxides
Stockholm University
2019-2025
Chinese University of Hong Kong
2024
University of Hong Kong
2018-2024
AlbaNova
2019-2022
Fritz Haber Institute of the Max Planck Society
2022
Cheng Shiu University
2022
Nanyang Technological University
2013-2020
Stockholm Environment Institute
2019
National Yang Ming Chiao Tung University
2014
National Taiwan University of Science and Technology
2011-2013
Spinel Co3O4, comprising two types of cobalt ions: one Co(2+) in the tetrahedral site (Co(2+)(Td)) and other Co(3+) octahedral (Co(3+)(Oh)), has been widely explored as a promising oxygen evolution reaction (OER) catalyst for water electrolysis. However, roles geometrical ions toward OER have remained elusive. Here, we investigated geometrical-site-dependent activity Co3O4 by substituting Co(2+)(Td) Co(3+)(Oh) with inactive Zn(2+) Al(3+), respectively. Following thorough operando analysis...
Efficient and earth abundant electrocatalysts for high‐performance oxygen evolution reaction (OER) are essential the development of sustainable energy conversion technologies. Here, a new hierarchical Ni–Co oxide nanostructure, composed small secondary nanosheets grown on primary nanosheet arrays, is synthesized via topotactic transformation layered double hydroxide. The Ni 3+ ‐rich surface benefits formation NiOOH, which main redox site as revealed in situ X‐ray absorption near edge...
ADVERTISEMENT RETURN TO ISSUEPREVViewpointNEXTUse of Platinum as the Counter Electrode to Study Activity Nonprecious Metal Catalysts for Hydrogen Evolution ReactionRong Chen†, Cangjie Yang†, Weizheng Cai†, Hsin-Yi Wang†, Jianwei Miao†, Liping Zhang†, Shengli Chen*‡, and Bin Liu*†View Author Information† School Chemical Biomedical Engineering, Nanyang Technological University, 62 Drive, Singapore 637459, Singapore‡ College Chemistry Molecular Sciences, Wuhan 430072, People’s Republic...
First-principles calculations suggest that doping TiO2 with carbonate can effectively reduce the bandgap of TiO2, thus making photoactive in visible region solar spectrum. Herein we report a simple “one-pot” solvothermal method for synthesizing brown carbonate-doped microspheres. The diameter microsphere is tunable from ∼0.5 to 4 μm nanopore size range 3–11 nm. Remarkably, specific surface area these nanoporous anatase microspheres be as high 500 m2 g−1. A controllable amount could...
Recent years have witnessed increasing interest in the solution‐phase synthesis of atomically precise thiolate‐protected gold clusters (Au x ); nonetheless, research on photocatalytic properties Au –semiconductor nanocomposites is still its infancy. In this work, recently developed glutathione‐capped and highly ordered nanoporous layer‐covered TiO 2 nanotube arrays (NP‐TNTAs) are employed as nanobuilding blocks for construction a well‐defined /NP‐TNTA heterostructure via facile electrostatic...
Catalytic water splitting driven by renewable electricity offers a promising strategy to produce molecular hydrogen, but its efficiency is severely restricted the sluggish kinetics of anodic oxidation reaction. Amorphous catalysts are reported show better activities than their crystalline counterparts, little known about underlying origin, which retards development high-performance amorphous oxygen evolution reaction catalysts. Herein, on basis cyclic voltammetry, electrochemical impedance...
Semiconductor‐based photocatalysis and photoelectrocatalysis have received considerable attention as alternative approaches for solar energy harvesting storage. The photocatalytic or photoelectrocatalytic performance of a semiconductor is closely related to the design at nanoscale. Among various nanostructures, one‐dimensional (1D) nanostructured photocatalysts photoelectrodes attracted increasing interest owing their unique optical, structural, electronic advantages. In this article,...
Carbon-based nanomaterials have been widely studied as promising electrocatalysts for energy conversion and storage. Understanding the oxygen evolution reduction reactions on carbon-based is of critical importance development highly active metal-free electrocatalysts. Here, adsorption oxygenated intermediates during reaction (OER) carbon nanotubes (CNTs) was examined by ex-situ X-ray photoelectron spectroscopy in situ electrochemical impedance spectroscopy. The results demonstrate that atoms...
Efficient oxygen evolution reaction (OER) electrocatalysts are pivotal for sustainable fuel production, where the Ni-Fe oxyhydroxide (OOH) is among most active catalysts alkaline OER. Electrolyte alkali metal cations have been shown to modify activity and intermediates, however, exact mechanism at question due unexplained deviations from cation size trend. Our X-ray absorption spectroelectrochemical results show that bigger shift Ni2+/(3+δ)+ redox peak OER lower potentials (however, with...
The active chemical state of zinc (Zn) in a zinc-copper (Zn-Cu) catalyst during carbon dioxide/carbon monoxide (CO2/CO) hydrogenation has been debated to be Zn oxide (ZnO) nanoparticles, metallic Zn, or Zn-Cu surface alloy. We used x-ray photoelectron spectroscopy at 180 500 millibar probe the nature and reaction intermediates CO2/CO over Zn/ZnO/Cu(211), where temperature is sufficiently high for rapidly turn over, thus creating an almost adsorbate-free surface. Tuning grazing incidence...
The formation of μ-OO peroxide (Co-OO-Co) moieties on spinel Co3O4 electrocatalyst prior to the rise electrochemical oxygen evolution reaction (OER) current was identified by in situ spectroscopic methods. Through a combination independent X-ray absorption, grazing-angle diffraction, and Raman analysis, we observed clear coincidence between anodic peak during OER. This finding implies that chemical step could be generally ignored before onset OER current. More importantly, tetrahedral Co2+...
Abstract The water‐splitting reaction, including the hydrogen and oxygen evolution reactions, as well electrochemical CO 2 reduction reactions offer promising solutions to address global energy scarcity associated environmental issues. However, lack of deep insight into reaction mechanisms clear identification catalytic active sites hinder any breakthrough for development efficient electrocatalysts with high performance durability. Operando characterization techniques allowing in situ...
Internet gaming disorder (IGD) has been viewed by scholars as (a) a pathology that co-occurs with psychological problems (comorbidity hypothesis), (b) maladaptive coping abundant interpersonal (interpersonal impairment and (c) deficient self-regulation the underlying motive to restore psychosocial well-being (dilution effect hypothesis). We examined associations between IGD symptoms four major criteria (psychological problems, well-being, well-being), compared magnitude of these across...
A facile two‐step solution‐phase method has been developed for the preparation of hierarchical α‐MnO 2 nanowires@Ni 1‐x Mn x O y nanoflakes core–shell nanostructures. Ultralong nanowires were synthesized by a hydrothermal in first step. Subsequently, Ni grown on to form nanostructures using chemical bath deposition followed thermal annealing. Both methods can be easily scaled up mass production. We have evaluated their application supercapacitors. The ultralong one‐dimensional (1D) offer...
We present a new high-pressure x-ray photoelectron spectroscopy system dedicated to probing catalytic reactions under realistic conditions at pressures of multiple bars. The instrument builds around the novel concept “virtual cell” in which gas flow onto sample surface creates localized pillow. This allows be operated with low pressure few millibar main chamber, while simultaneously local exceeding 1 bar can supplied surface. Synchrotron based hard excitation is used increase electron mean...
Abstract The electronic configuration is crucial in governing the binding strength of intermediates with catalysts, yet it still challenging to control catalysts' surface spin state. Here, demonstrated that through metal–organic framework transformation followed by acid etching, state Co 3+ ions on spinel 3 O 4 can be transformed from t 2g 6 high e g 2 expanding lattice constant, which significantly enhances overlap orbital cobalt oxygen adsorbates, and greatly improves adsorption thus...
Subsurface oxygen has been proposed to be crucial in oxide-derived copper (OD-Cu) electrocatalysts for enhancing the binding of CO intermediates during
In recent years, much attention has been focused on the preparation of CdS–TiO2 nanotube array (CdS–TNTA) hybrid nanomaterials. Nevertheless, it is still challenging to synthesize hierarchically ordered CdS–TNTA heterostructures as efficient photocatalysts via a facile and simple approach. this work, tailor-made negatively charged CdS quantum dots (QDs) are evenly deposited hierarchical framework TiO2 arrays, consisting periodically nanorings surface nanotubes underneath, by modulating...
Recent years have witnessed quite a number of worldwide efforts for fabricating CdSe/TiO2 nanotube arrays (CdSe/TNTAs) nanocomposites; however, the construction well-defined CdSe/TNTAs binary nanostructure versatile photocatalytic and photoelectrochemical applications still poses big challenge. In this work, hierarchically ordered CdSe/nanoporous TiO2 (CdSe/NP-TNTAs) hybrid was fabricated through facile electrochemical deposition strategy. The combined structural morphological...
Carbide formation on iron-based catalysts is an integral and, arguably, the most important part of Fischer-Tropsch synthesis process, converting CO and H2 into synthetic fuels numerous valuable chemicals. Here, we report in situ surface-sensitive study effect pressure, temperature, time, gas feed composition growth dynamics two distinct iron-carbon phases with octahedral trigonal prismatic coordination carbon sites Fe(110) single crystal acting as a model catalyst. Using combination...
In a photoelectrochemical cell, the most concerned issue in nanostructured TiO 2 electrode is charge transport, which consists of internal movement electrons nanostructures and intergrain transfer. Here, inspired by electrochemical studies on different polymorphs , it proposed to bridge adjacent building blocks fence electron transport highways electrodes surface rutilization anatase nanorods. The ultrathin rutilized layer completely coated has slightly higher conduction band edge than that...