Dong‐Wan Kim

For mass production of hydrogen fuel by electrochemical water splitting, seawater electrolysis is preferred over freshwater electrolysis because of the abundance of seawater in nature. However, the electrochemically active anions in seawater can cause the corrosion of electrodes or undesirable side reactions during the anodic reaction at the anode, thus degrading the overall system efficiency. Hence, it is imperative to develop highly active and stable oxygen evolution reaction (OER) electrocata

Abstract Developing low‐cost, highly active, and stable bifunctional electrocatalysts is a challenging issue in electrochemical water electrolysis. Building on 3D architectured electrocatalysts through structural and compositional engineering is an effective strategy to enhance catalytic activities as well as stability and durability. Herein, 3D architectures of quaternary Co‐Ni‐S‐P compounds coupled with graphene ((Co 1− x Ni x )(S 1− y P y ) 2 /G) electrocatalysts are proposed, in which nanosh

Abstract Lithium is regarded as an ideal anode for next‐generation Li metal batteries (LMB) as it exhibits extraordinarily high theoretical capacity and the lowest electrochemical potential among all anode candidates. However, safety concerns and poor cycling stability of Li induced by uncontrollable dendrite growth and severe side reactions impede its practical application for LMB. Although various strategies for fabricating Li anodes have been suggested, developing high‐rate LMB remains a sign

We report on the self-supported, two-dimensional (2D) SnS nanosheets electrode directly grown on metallic current collectors via non-catalytic and template-free, vapor transport synthetic route. The self-supported SnS nanosheets electrode demonstrates good cycling performance and superior rate capabilities: a capacity of ∼380 mAh g−1 even at 20C rate (after charging for 3 min), larger than the theoretical capacity of the carbon-based electrodes currently used in commercial Li ion batteries. The

Germanium (Ge) nanoparticle-multiwalled carbon nanotube (MWCNT) anodes are fabricated through the anchoring of Ge on the surface of electrophoretically pre-deposited MWCNT networks via a thermal evaporation process. This Ge-MWCNT nanocomposite displays a large reversible capacity of over 800 mA h g(-1) at 1 C even after 200 cycles.

Abstract Aqueous Zn metal batteries (ZMBs) are receiving attention as large‐scale energy storage systems owing to their high theoretical capacity, low toxicity, and the abundance of Zn. However, Zn anodes still undergo undesired dendrite growth and intrinsic side reactions, thereby hindering the practical application of ZMBs. In this study, a multifunctional porous zincophilic carbon host (FPCH) assisted by a thin ZnO interphase (ZI) on bare Zn (FPCH‐ZI/Zn) is rationally designed as the interfac

A new electrode material that is expected to have promising applications in energy storage and energy-harvesting systems is presented. In this material, which consists of Ca3Co4O9 nanoplates with a high theoretical gravimetric capacity, the lithium-driven conversion process results in the formation of active/inactive nanocomposite electrodes that mitigate the aggregation of the active nanometals (see picture). Supporting information for this article is available on the WWW under http://www.wiley

The development of efficient electrocatalysts is important to produce clean and sustainable hydrogen fuel on a large scale. With respect to cathodic reactions, Pt exhibits an overwhelming electrocatalytic capability in the hydrogen evolution reaction (HER) in comparison with other earth-abundant electrocatalysts, despite its rarity and high cost. So, a hybrid catalyst that combines a low-cost electrocatalyst with Pt would balance cost-effectiveness with catalytic activity. Herein, α-phase molybd

We herein present the synthesis of germanium (Ge) nanowires on Au-catalyzed low-temperature substrates using a simple thermal Ge/Sn co-evaporation method. Incorporation of a low-melting point metal (Sn) enables the efficient delivery of Ge vapor to the substrate, even at a source temperature below 600 °C. The as-synthesized nanowires were found to be a core/shell heterostructure, exhibiting a uniform single crystalline Ge sheathed within a thin amorphous germanium suboxide (GeO(x)) layer. Furthe