Soshan Cheong
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View article: Size‐Controlled Cobalt Nanoplates and Their Impact on Oxygen Evolution Catalysis
Size‐Controlled Cobalt Nanoplates and Their Impact on Oxygen Evolution Catalysis Open
Controlling the size of nanoparticles is important in catalytic reactions, not only for tuning the surface area but also for modifying the electronic structure. However, achieving precise size control in 2D structures remains challenging. …
View article: Using In Situ TEM to Understand the Surfaces of Electrocatalysts at Reaction Conditions: Single‐Atoms to Nanoparticles
Using In Situ TEM to Understand the Surfaces of Electrocatalysts at Reaction Conditions: Single‐Atoms to Nanoparticles Open
Catalytic activity is improved by reducing particle size, followed by atomic scale structural and chemical design, allowing physical and electronic confinement of chemical conversion centers. These concepts culminate in single‐atom catalys…
View article: How the Arrangement of Platinum Atoms on Ruthenium Nanoparticles Improves Hydrogen Evolution Activity
How the Arrangement of Platinum Atoms on Ruthenium Nanoparticles Improves Hydrogen Evolution Activity Open
The platinum‐ruthenium (PtRu) system is highly active for hydrogen evolution reaction (HER) in alkaline media with both Pt and Ru playing active roles in the water dissociation step that generates adsorbed hydrogen atoms. Precise control o…
View article: Iridium Nanocrystals Enriched with Defects and Atomic Steps to Enhance Oxygen Evolution Reaction Performance
Iridium Nanocrystals Enriched with Defects and Atomic Steps to Enhance Oxygen Evolution Reaction Performance Open
The presence of defects can significantly improve catalytic activity and stability, as they influence the binding of the reactants, intermediates, and products to the catalyst. Controlling defects in the structures of nanocrystal catalysts…
View article: A photovoltaic-electrolysis system with high solar-to-hydrogen efficiency under practical current densities
A photovoltaic-electrolysis system with high solar-to-hydrogen efficiency under practical current densities Open
The photovoltaic-alkaline water (PV-AW) electrolysis system offers an appealing approach for large-scale green hydrogen generation. However, current PV-AW systems suffer from low solar-to-hydrogen (STH) conversion efficiencies (e.g., <20%)…
View article: Selenium nanoparticles as catalysts for nitric oxide generation
Selenium nanoparticles as catalysts for nitric oxide generation Open
The critical role of nitric oxide (NO), a potent signalling molecule, in various physiological processes has driven the development of NO delivery strategies for numerous therapeutic applications. However, NO's short half-life poses a sign…
View article: Formation of open ruthenium branched structures with highly exposed active sites for oxygen evolution reaction electrocatalysis
Formation of open ruthenium branched structures with highly exposed active sites for oxygen evolution reaction electrocatalysis Open
The open Ru branched nanostructures provide high accessibility to incoming reagents and high electrochemically active surface areas for catalysing the oxygen evolution reaction.
View article: Atomic Dispersed Co on NC@Cu Core‐Shells for Solar Seawater Splitting
Atomic Dispersed Co on NC@Cu Core‐Shells for Solar Seawater Splitting Open
With freshwater resources becoming increasingly scarce, the photocatalytic seawater splitting for hydrogen production has garnered widespread attention. In this study, a novel photocatalyst consisting of a Cu core coated is introduced with…
View article: How Size and Composition of Cobalt Doped Iron Oxide Nanoparticle Tracers Enhance Magnetic Particle Imaging Performance
How Size and Composition of Cobalt Doped Iron Oxide Nanoparticle Tracers Enhance Magnetic Particle Imaging Performance Open
Magnetic particle imaging (MPI) is a promising diagnostic imaging technique that enables direct and precise tracking of magnetic tracers. The optimization of iron oxide-based nanoparticle tracers is of utmost importance in MPI for attainin…
View article: Liquid Metal Doping Induced Asymmetry in Two‐Dimensional Metal Oxides
Liquid Metal Doping Induced Asymmetry in Two‐Dimensional Metal Oxides Open
The emergence of ferroelectricity in two‐dimensional (2D) metal oxides is a topic of significant technological interest; however, many 2D metal oxides lack intrinsic ferroelectric properties. Therefore, introducing asymmetry provides acces…
View article: Tuning the Pt–Ru Atomic Neighbors for Active and Stable Methanol Oxidation Electrocatalysis
Tuning the Pt–Ru Atomic Neighbors for Active and Stable Methanol Oxidation Electrocatalysis Open
Controlling the coordination environment of the nanocatalyst surface is a major synthetic challenge to producing electrocatalysts with high activity and high stability. This is particularly important for the methanol oxidation reaction (MO…
View article: Controlling Platinum Active Sites on Silver Nanoparticles for Hydrogen Evolution Reaction
Controlling Platinum Active Sites on Silver Nanoparticles for Hydrogen Evolution Reaction Open
Growing Pt on Ag nanoparticles is a promising approach to forming catalysts that present active sites with both Pt and Ag available to improve the activity for the hydrogen evolution reaction (HER). By carefully controlling the concentrati…
View article: Synthesis of hierarchical metal nanostructures with high electrocatalytic surface areas
Synthesis of hierarchical metal nanostructures with high electrocatalytic surface areas Open
3D interconnected structures can be made with molecular precision or with micrometer size. However, there is no strategy to synthesize 3D structures with dimensions on the scale of tens of nanometers, where many unique properties exist. He…
View article: Nanoconfinement Allows a Less Active Cascade Catalyst to Produce More C<sub>2+</sub> Products in Electrochemical CO<sub>2</sub> Reduction
Nanoconfinement Allows a Less Active Cascade Catalyst to Produce More C<sub>2+</sub> Products in Electrochemical CO<sub>2</sub> Reduction Open
Enzymes with multiple distinct active sites linked by substrate channels combined with control over the solution environment near the active sites enable the formation of complex products from simple reactants via the confinement of interm…
View article: Rationalized design of hyperbranched trans-scale graphene arrays for enduring high-energy lithium metal batteries
Rationalized design of hyperbranched trans-scale graphene arrays for enduring high-energy lithium metal batteries Open
Lithium (Li) metal anode have shown exceptional potential for high-energy batteries. However, practical cell-level energy density of Li metal batteries is usually limited by the low areal capacity (6 mAh cm −2 ). Such atomic-to-macroscopic…
View article: Unveiling microscopic carrier loss mechanisms in 12% efficient Cu2ZnSnSe4 solar cells
Unveiling microscopic carrier loss mechanisms in 12% efficient Cu2ZnSnSe4 solar cells Open
Understanding carrier loss mechanisms at microscopic regions is imperative for the development of high-performance polycrystalline inorganic thin-film solar cells. Despite the progress achieved for kesterite, a promising environmentally be…
View article: Pt Single Atom Electrocatalysts at Graphene Edges for Efficient Alkaline Hydrogen Evolution
Pt Single Atom Electrocatalysts at Graphene Edges for Efficient Alkaline Hydrogen Evolution Open
Graphene edges exhibit a highly localized density of states that result in increased reactivity compared to its basal plane. However, exploiting this increased reactivity to anchor and tune the electronic states of single atom catalysts (S…
View article: Introducing Stacking Faults into Three-Dimensional Branched Nickel Nanoparticles for Improved Catalytic Activity
Introducing Stacking Faults into Three-Dimensional Branched Nickel Nanoparticles for Improved Catalytic Activity Open
Creating high surface area nanocatalysts that contain stacking faults is a promising strategy to improve catalytic activity. Stacking faults can tune the reactivity of the active sites, leading to improved catalytic performance. The format…
View article: Two‐Dimensional Ultra‐Thin Nanosheets with Extraordinarily High Drug Loading and Long Blood Circulation for Cancer Therapy
Two‐Dimensional Ultra‐Thin Nanosheets with Extraordinarily High Drug Loading and Long Blood Circulation for Cancer Therapy Open
Nanoparticle drug delivery is largely restricted by the low drug loading capacity of nanoparticle carriers. To address this critical challenge and maximize the potential of nanoparticle drug delivery, a 2D ultra‐thin layered double hydroxi…
View article: Perovskite Quantum Dot Solar Cells Fabricated from Recycled Lead-Acid Battery Waste
Perovskite Quantum Dot Solar Cells Fabricated from Recycled Lead-Acid Battery Waste Open
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Materials Letters, copyright © 2021 American Chemical Societ, after peer review and technical editing by the publisher. To access the f…
View article: Quantum Dot Passivation of Halide Perovskite Films with Reduced Defects, Suppressed Phase Segregation, and Enhanced Stability
Quantum Dot Passivation of Halide Perovskite Films with Reduced Defects, Suppressed Phase Segregation, and Enhanced Stability Open
Structural defects are ubiquitous for polycrystalline perovskite films, compromising device performance and stability. Herein, a universal method is developed to overcome this issue by incorporating halide perovskite quantum dots (QDs) int…
View article: Role of the Secondary Metal in Ordered and Disordered Pt–M Intermetallic Nanoparticles: An Example of Pt<sub>3</sub>Sn Nanocubes for the Electrocatalytic Methanol Oxidation
Role of the Secondary Metal in Ordered and Disordered Pt–M Intermetallic Nanoparticles: An Example of Pt<sub>3</sub>Sn Nanocubes for the Electrocatalytic Methanol Oxidation Open
When comparing alloy catalysts with different degrees of ordering, it is important to maintain surface facets to understand the effect of different arrangements of surface atoms. This is even more important when both metals are involved in…
View article: Single Pt atoms on Ru nanoparticles for CO-resistant methanol oxidation reaction electrocatalysis
Single Pt atoms on Ru nanoparticles for CO-resistant methanol oxidation reaction electrocatalysis Open
Single Pt atom catalysts on non-active carbon supports have been key targets for electrochemical reactions because the high exposure of active Pt leads to record-high activities. PtRu alloy catalysts are the most active for the methanol ox…
View article: Metrology of convex-shaped nanoparticles <i>via</i> soft classification machine learning of TEM images
Metrology of convex-shaped nanoparticles <i>via</i> soft classification machine learning of TEM images Open
The shape of nanoparticles is a key performance parameter for many applications, ranging from nanophotonics to nanomedicines.
View article: Controlling the Number of Branches and Surface Facets of Pd‐Core Ru‐Branched Nanoparticles to Make Highly Active Oxygen Evolution Reaction Electrocatalysts
Controlling the Number of Branches and Surface Facets of Pd‐Core Ru‐Branched Nanoparticles to Make Highly Active Oxygen Evolution Reaction Electrocatalysts Open
Producing stable but active materials is one of the enduring challenges in electrocatalysis and other types of catalysis. Producing branched nanoparticles is one potential solution. Controlling the number of branches and branch size of fac…