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Alkaline water electrolysis is an advanced technology for scalable H2 production using surplus electricity from intermittent energy sources, but it remains challenging for non‐noble electrocatalysts to split water into hydrogen and oxygen efficiently, especially for tungsten disulfide (WS2)‐based catalysts. Density functional theory calculations in combination with experimental study are used to establish...
Effects of electronic and atomic structures of V‐doped 2D layered SnS2 are studied using X‐ray spectroscopy for the development of photocatalytic/photovoltaic applications. Extended X‐ray absorption fine structure measurements at V K‐edge reveal the presence of VO and VS bonds which form the intercalation of tetrahedral OVS sites in the van der Waals (vdW) gap of SnS2 layers. X‐ray absorption...
It is an effective strategy to develop novel electrocatalysts with controllable defects to enhance their electrocatalytic activity and stability. However, how to precisely design these catalysts on the atom scale remains very difficult. Herein, several vacancy‐dependent CoZnxMn2–xO4 catalysts are prepared through tailoring the concentration of Zn ions. The in situ activation of the obtained products...
Conventional synthesis of carbon dots (CDs) mostly involves a hydrothermal or solvent‐thermal reaction which needs relatively high temperature and pressure. In this work, ionic liquid is used to assist in fast synthesizing CDs with an ultrahigh photoluminescent quantum yield (98.5%) by heating at a low temperature (≤100 °C) and at atmospheric pressure. In addition, through this approach, tunable multicolor...
Electrochemical N2 fixation requires effective electrocatalysts to expedite the nitrogen reduction reaction (NRR) kinetics and suppress the concomitant hydrogen evolution reaction (HER). Although transition metal sulfides have been deemed as efficient NRR electrocatalysts, it remains a great challenge to suppress the serious HER to achieve high Faradaic efficiency (FE). Herein, vanadium disulfide...
NiCo2O4 nanowire array on carbon cloth (NiCo2O4/CC) is proposed as a highly active electrocatalyst for ambient nitrate (NO3−) reduction to ammonia (NH3). In 0.1 m NaOH solution with 0.1 m NaNO3, such NiCo2O4/CC achieves a high Faradic efficiency of 99.0% and a large NH3 yield up to 973.2 µmol h−1 cm−2. The superior catalytic activity of NiCo2O4 comes from its half‐metal feature and optimized adsorption...
Manipulating catalytic active sites and reaction kinetics in alkaline media is crucial for rationally designing mighty water‐splitting electrocatalysts with high efficiency. Herein, the coupling between oxygen vacancies and interface engineering is highlighted to fabricate a novel amorphous/crystalline CrOx‐Ni3N heterostructure grown on Ni foam for accelerating the alkaline hydrogen evolution reaction...
High overpotentials required to cross the energy barriers of both hydrogen and oxygen evolution reactions (HER and OER) limit the overall efficiency of hydrogen production by electrolysis of water. The rational design of heterostructures and anchoring single‐atom catalysts (SAC) are the two successful strategies to lower these overpotentials, but realization of such advanced nanostructures with adequate...
All‐Solid‐State Thin‐Film Batteries
In article number 2201134, Dong‐Hwa Seo, Hyun‐Suk Kim, and co‐workers demonstrate cation (Ni and Mn)‐ordering effects using thin‐film LiNi0.5Mn1.5O4 cathode materials with or without oxygen vacancies. The authors explain that cations order changes from a disordered structure to an ordered structure with increased oxygen (O2) flow rate (Ar:O2 flowing) during sputter...
All‐solid‐state thin‐film batteries (ASSTFBs) are promising next‐generation battery systems, but critical challenges such as low‐energy‐density remain. The low‐energy‐density might persist with low‐voltage cathode material; hence, high‐voltage cathode material development is required. While LiNi0.5Mn1.5O4 (LNM) has been considered a promising high‐voltage cathode material. This study investigates...
Despite the excellent optoelectronic properties, organic‐inorganic hybrid perovskite solar cells (PSCs) still present significant challenges in terms of ambient stability. CsPbI2Br, a member of all‐inorganic perovskites, may respond to this challenge because of its inherent high stability against light, moisture, and heat, and therefore has gained tremendous attraction recently. However, the practical...
The structure–activity relationship is a cornerstone topic in catalysis, which lays the foundation for the design and functionalization of catalytic materials. Of particular interest is the catalysis of the hydrogen evolution reaction (HER) by palladium (Pd), which is envisioned to play a major role in realizing a hydrogen‐based economy. Interestingly, experimentalists observed excess heat generation...
Proton Electroreduction
In article number 2202410, Elena L. Gubanova, Aliaksandr S. Bandarenka, Matthias Vandichel, and co‐workers report the structure–activity relations that govern the complex electrochemical processes for the proton electro‐reduction on Pd(hkl) electrodes using a combination of theoretical and experimental approaches. The formation of subsurface hydride results in morphological...
Regulating the catalytic pathways of single‐atom sites in single atom catalysts (SACs) is an exciting debate at the moment, which has redirected the research towards understanding and modifying the single‐atom catalytic sites through various strategies including altering the coordination environment of single atom for desirable outcomes as well as increasing their number. One useful aspect concerning...
Dispersing carbon nanomaterials in solvents is effective in transferring their significant mechanical and functional properties to polymers and nanocomposites. However, poor dispersion of carbon nanomaterials impedes exploiting their full potential in nanocomposites. Cellulose nanocrystals (CNCs) are promising for dispersing and stabilizing pristine carbon nanotubes (pCNTs) and graphene nanoplatelets...
The fiber‐shaped aqueous battery (FSAB) has the advantages of flexibility, portability and safety making it promising for energy storage applications. In particular, FSABs based on metal wire current collectors with good electrical conductivity can provide excellent energy storage properties. However, the low adhesion caused by the smooth surface of the metal wire and the unavailability of many electrochemically...
Finding low‐cost and nontoxic redox couples for organic redox flow batteries is challenging due to unrevealed reaction mechanisms and side reactions. In this study, a 3D kinetic Monte Carlo model to study the electrode‐anolyte interface of a methyl viologen‐based organic redox flow battery is presented. This model captures various electrode processes, such as ionic displacement and degradation of...
Hard carbon (HC) anodes together with ethylene carbonate (EC)‐based electrolytes have shown significant promise for high‐performing sodium‐ion batteries. However, questions remain in relation to the initial contact between the carbon surface and the EC molecules. The surface of the HC anode is complex and can contain both flat pristine carbon surfaces, curvature, nanoscale roughness, and heteroatom...
Organic Redox Flow Batteries
In article number 2107720, Alejandro A. Franco and co‐workers present a 3D model based on kinetic Monte Carlo to study the electrode–anolyte interface of a methyl viologen‐based organic redox flow battery. This model captures various electrode processes, including the electron transfer, ionic displacement, and degradation of active materials. In this study, various discharging...
Lead‐free perovskites have gained much interest for photovoltaic and optoelectronic applications. But instability and low quantum efficiency significantly limit their prospects for future applications. Here, a general route is reported to synthesize highly stable lead‐free perovskites on a large scale with remarkably enhanced quantum efficiency. Two typical vacancy‐ordered double perovskites (Cs2ZrCl...
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