EunAe Cho

Bimetallic PtNi nanoparticles have been considered as a promising electrocatalyst for oxygen reduction reaction (ORR) in polymer electrolyte membrane fuel cells (PEMFCs) owing to their high catalytic activity. However, under typical fuel cell operating conditions, Ni atoms easily dissolve into the electrolyte, resulting in degradation of the catalyst and the membrane-electrode assembly (MEA). Here, we report gallium-doped PtNi octahedral nanoparticles on a carbon support (Ga-PtNi/C). The Ga-PtNi

A high-performance bifunctional Co–P foam catalyst was successfully synthesized by facile one-step electrodeposition at a high cathodic current density.

Exploring highly efficient platinum single-atom (Pt1) catalysts for oxygen reduction reaction (ORR) is desired to greatly reduce the catalysts costs of polymer electrolyte membrane (PEM) fuel cells. Herein, based on a nitrogen-doped active carbon (N-doped Black Pearl, NBP), an atomically dispersed Pt-based electrocatalyst is first prepared via a hydrothermal ethanol reduction method with Pt content of about 5 wt % (Pt1/NBP), and it shows high selectivity for the two-electron oxygen reduction pat

We report electrospun Co-carbon nanofibers as an efficient ORR catalyst and a study of active site formation.

Iron- and nitrogen-doped carbon (Fe–N–C) materials have been suggested as the most promising replacement for Pt-based catalysts in the oxygen reduction reaction (ORR) owing to the FeN4 active moiety. Based on the relationship between the oxygen binding energy and the catalytic activity, Fe–N–C has a very strong oxygen binding energy; hence, hard to desorb the final reaction intermediate of *OH. Herein, we provide an effective method of tuning the active moiety using a phosphine-gas treatment for

Si, the high-capacity anode for Li-ion battery (LIB), has intrinsic 300% volume changes limiting its commercial application. The volume change leads to particle pulverization that results in loss of electrical contacts. Various nanostructures are proposed to avoid the pulverization, but the commercialization is still a distant future. Recently, Al2O3 has demonstrated its ability to enhance electrochemical cycling performance. However, a comprehensive mechanistic role of the Al2O3 has not been we

A 3D porous Co–Fe–P foam fabricated using electrodeposition is presented as a high-performance and durable catalyst for both oxygen and hydrogen evolution reactions. To establish optimal Fe/Co ratio of the catalyst, Co–Fe–P films were electrodeposited with Fe/Co ratio of 0.2, 0.4, 1.1, and 3.3. Among the prepared samples, the Co–Fe–P film with the Fe/Co ratio of 1.1 (Co–Fe–P-1.1) exhibited the highest activity for the oxygen evolution reaction, which could be attributed to the transfer of the va

Corrosion of carbon support is one of the most crucial causes of the degradation of polymer electrolyte membrane fuel cells (PEMFCs) utilizing carbon-supported platinum nanoparticles (Pt/C) as a catalyst. To mitigate carbon corrosion, Pt is alloyed with iridium (Ir), which is catalytically active for the oxygen evolution reaction (OER), with various compositions of PtxIry. The carbon-supported PtxIry alloy catalysts (PtxIry/C) show slightly lower initial activity for the oxygen reduction reactio