Yong‐Tae Kim 교수

The selection of oxide materials for catalyzing the oxygen evolution reaction in acid-based electrolyzers must be guided by the proper balance between activity, stability and conductivity-a challenging mission of great importance for delivering affordable and environmentally friendly hydrogen. Here we report that the highly conductive nanoporous architecture of an iridium oxide shell on a metallic iridium core, formed through the fast dealloying of osmium from an Ir₂₅Os₇₅ a

Bond formation between single Pt atoms and surface thiol groups is the result of the reduction of a Pt precursor in the presence of surface-thiolated carbon nanotubes. By setting the temperature of the following heat treatment, finely size-controlled and monodispersed Pt clusters were obtained from the dispersed single atoms (see picture).

To enhance its pseudocapacitance, ruthenium oxide must be formed with a hydrated amorphous and porous structure and a small size, because this structure provides a large surface area and forms conduction paths for protons to easily access even the inner part of the RuO2. In this study, we report that highly dispersed RuO2 nanoparticles could be obtained on carboxylated carbon nanotubes. This could be achieved by preventing agglomeration among RuO2 nanoparticles by bond formation between the RuO2

Mo-doped TiNb2O7 (TNO) anode material has shown excellent electrochemical performance, especially at high C-rates. Doping TNO with Mo(6+) resulted in charge redistribution, leading to the enhancement of electronic conductivity (caused by bandgap narrowing) and Li(+) diffusivity in the lattice.

Since one of the main drawbacks of Li4Ti5O12 as a negative-electrode material is its low electronic conductivity, several researchers have attempted to improve the conductivity by narrowing the band gap through transition-metal doping. Herein, we report another, more significant effect of doping in addition to the band gap narrowing, namely, an anomalous decrease in the structural disorder in Li4Ti5O12 upon Cr3+-ion doping. Although it is generally recognized that doping with heterogeneous eleme

In this letter we show that it is possible to drastically change electric double layer capacitance, from a large increase to complete disappearance, by introducing various surface functional groups on carbon nanotubes. The introduction of surface carboxyl groups created a 3.2 times larger capacitance due to the increased hydrophilicity of the multiwalled carbon nanotubes in an aqueous electrolyte. In contrast, the introduction of alkyl groups resulted in a marked decrease of capacitance. Notably

Growing the hydrogen economy requires improving the stability, efficiency, and economic value of water-splitting technology, which uses an intermittent power supply from renewable energy sources. Alkaline water electrolysis systems face a daunting challenge in terms of stabilizing hydrogen production under the condition of transient start-up/shut-down operation. Herein, we present a simple but effective solution for the electrode degradation problem induced by the reverse-current under transient

Herein, we report a cheap and simple approach to solve the polysulfide dissolution problem in lithium sulfur batteries. It was interestingly revealed that a simple insertion of acetylene black mesh enabled us to obtain the capacity of 1491 mA h g(-1) at initial discharge and 1062 mA h g(-1) after 50 cycles.

Eine Bindungsbildung zwischen einzelnen Pt-Atomen und Oberflächen-Thiolgruppen ist die Folge der Reduktion einer Pt-Vorstufe in Gegenwart Oberflächen-thiolierter Kohlenstoffnanoröhren. Durch Variation der Temperatur bei der anschließenden Wärmebehandlung wurden monodisperse Pt-Cluster mit fein einstellbarer Größe aus den dispergierten Einzelatomen erhalten (siehe Bild). Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2001/2006/z501792_s.h

While achieving high product selectivity is one of the major challenges of the CO2 electroreduction technology in general, Pb is one of the few examples with high selectivity that produces formic acid almost exclusively (versus H2, CO, or other byproducts). In this work, we study the mechanism of CO2 electroreduction reactions using Pb to understand the origin of high formic acid selectivity. In particular, we first assess the proton-assisted mechanism proposed in the literature using density fu