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Layered 2D transition metal dichalcogenides (TMDs) have been suggested as efficient substitutes for Pt‐group metal electrocatalysts in the hydrogen evolution reaction (HER). However, poor catalytic activities in neutral and alkaline electrolytes considerably hinder their practical applications. Furthermore, the weak adhesion between TMDs and electrodes often impedes long‐term durability and thus requires...
Structural engineering and hybridization of heterogeneous 2D materials can be effective for advanced supercapacitor. Furthermore, architectural design of electrodes particularly with vertical construction of structurally anisotropic graphene nanosheets, can significantly enhance the electrochemical performance. Herein, MXene‐derived TiO2 nanocomposites hybridized with vertical graphene is synthesized...
Phase‐Transition Ion Gels
In article number 2301868, Hong Chul Moon and co‐workers report highly deformable and thermo‐responsive ion gels produced by simply blending PS‐r‐PnBMA (copolymer gelator) and [BMI][TFSI] (ionic liquid). The functional gel‐based sensory platforms can successfully recognize thermal and mechanical environmental changes through variations in the optical (transmittance) and electrical...
Wearable ionoskins are one of the representative examples of the many useful applications offered by deformable stimuli‐responsive sensory platforms. Herein, ionotronic thermo‐mechano‐multimodal response sensors are proposed, which can independently detect changes in temperature and mechanical stimuli without crosstalk. For this purpose, mechanically robust, thermo‐responsive ion gels composed of...
Carbonate Electrolytes
The problem of Li dendrites is a demanding issue for the commercialization of Li metal batteries (LMBs). In article number 2301754, Jong‐Won Lee, Min‐Sik Park, Ki Jae Kim, and co‐workers propose a one‐body functional separator, which effectively suppresses the Li dendrite by controlling both nucleation and concentration overpotential. Consequently, the application of the proposed...
The uncontrollable dendritic growth of metallic lithium during repeated cycling in carbonate electrolytes is a crucial obstacle hindering the practical use of Li‐metal batteries (LMBs). Among numerous approaches proposed to mitigate the intrinsic constraints of Li metal, the design of a functional separator is an attractive approach to effectively suppress the growth of Li dendrites because direct...
Three‐dimensional (3D) bioprinting, which is being increasingly used in tissue engineering, requires bioinks with tunable mechanical properties, biological activities, and mechanical strength for in vivo implantation. Herein, a growth‐factor‐holding poly(organophosphazene)‐based thermo‐responsive nanocomposite (TNC) bioink system is developed. The mechanical properties of the TNC bioink are easily...
Despite of extremely high theoretical capacity of Si (3579 mAh g−1), Si anodes suffer from pulverization and delamination of the electrodes induced by large volume change during charge/discharge cycles. To address those issues, herein, self‐healable and highly stretchable multifunctional binders, polydioxythiophene:polyacrylic acid:phytic acid (PEDOT:PAA: PA, PDPP) that provide Si anodes with self‐healability...
Thermo‐Responsive Nanocomposite Bioinks
Poly(organophosphazene)‐based thermo‐responsive nanocomposite bioink, with tunable mechanical property under a moderate temperature range, exhibits good 3D printing outcomes without additional chemical crosslinking process. The bioink encapsulates growth factors through physical interaction, exhibiting biological activities and therapeutic potential for bone...
By controlling the configuration of polymorphic phases in high‐k Hf0.5Zr0.5O2 thin films, new functionalities such as persistent ferroelectricity at an extremely small scale can be exploited. To bolster the technological progress and fundamental understanding of phase stabilization (or transition) and switching behavior in the research area, efficient and reliable mapping of the crystal symmetry encompassing...
Electrocatalytic reactions are known to take place at the catalyst/electrolyte interface. Whereas recent studies of size‐dependent activity in nanoparticles and thickness‐dependent activity of thin films imply that the sub‐surface layers of a catalyst can contribute to the catalytic activity as well, most of these studies consider actual modification of the surfaces. In this study, the role of catalytically...
Here, lamellar confinement strategy is introduced for “sheet‐to‐nanocrystals (NCs)” conversion within a 2D‐SiO2 envelope, which constructs a catalytic nanocartridge holding a platoon of isolated and in‐plane‐aligned ultrasmall Ni‐NCs, performing as a robust and coking‐resistant catalytic system for dry reforming of methane. Overcoming the problem of unavoidable bulk crystal growth from multiple sheets‐stack...
The pulsed laser fragmentation in liquid (PLFL) process is a promising technique for the synthesis of carbon‐based functional materials. However, a fundamental deep understanding of the formation of graphene quantum dots (GQDs) from multiwalled carbon nanotubes (MWCNTs) by PLFL has still not been achieved despite the high demand. In article number 2003538, Jeong Ho Ryu, Hyuksu Han, Kang Min Kim, and...
The pulsed laser fragmentation in liquid (PLFL) process is a promising technique for the synthesis of carbon‐based functional materials. In particular, there has been considerable attention on graphene quantum dots (GQDs) derived from multiwalled carbon nanotubes (MWCNTs) by the PLFL process, owing to the low cost and rapid processing time involved. However, a fundamental deep understanding of the...
Transition metal (TM)‐based carbon hybrids have numerous applications in the field of regenerative electrochemical energy. The synergetic effects of high conductivity of carbon supports and abundant catalytic active sites in TMs make these hybrids promising oxygen evolution reaction (OER) electrocatalysts. However, strategies for modulating the catalytic active species in the above hybrids are limited...
A nitrogen doped carbon nanotube and cobalt nanoparticle hybrid is prepared by a facile atomic layer deposition process exhibiting excellent oxygen evolution activity, and long‐term durability by utilizing a high number of pyridinic nitrogen sites and better electrical conductivity of carbon supports encapsulating metallic cobalt nanoparticles in article number 2002427 by Kang Min Kim, Jin Kuen Park,...
Battery‐type materials are promising candidates for achieving high specific capacity for supercapacitors. However, their slow reaction kinetics hinders the improvement in electrochemical performance. Herein, a hybrid structure of P‐doped Co3O4 (P‐Co3O4) ultrafine nanoparticles in situ encapsulated into P, N co‐doped carbon (P, N‐C) nanowires by a pyrolysis–oxidation–phosphorization of 1D metal–organic...
The quadruple‐level cell technology is demonstrated in an Au/Al2O3/HfO2/TiN resistance switching memory device using the industry‐standard incremental step pulse programming (ISPP) and error checking/correction (ECC) methods. With the highly optimistic properties of the tested device, such as self‐compliance and gradual set‐switching behaviors, the device shows 6σ reliability up to 16 states with...
High‐quality and large‐area molybdenum disulfide (MoS2) thin film is highly desirable for applications in large‐area electronics. However, there remains a challenge in attaining MoS2 film of reasonable crystallinity due to the absence of appropriate choice and control of precursors, as well as choice of suitable growth substrates. Herein, a novel and facile route is reported for synthesizing few‐layered...
This study demonstrates that small amount of oxygen incorporated into carbon nanotubes (CNTs) during the purification process greatly increases their solubility in chlorosulfonic acid (CSA). Using as‐purchased and unpurified CNT powders, the optimal purification process is established to significantly increase the solubility of CNTs in CSA, and spin CNT fibers with high mechanical strength (0.84 N...
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