Ertl Center for Electrochemistry and Catalysis

Gwangju, South Korea

Ertl Center for Electrochemistry and Catalysis

Gwangju, South Korea
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Choun M.,Ertl Center for Electrochemistry and Catalysis | Ham K.,Ertl Center for Electrochemistry and Catalysis | Shin D.,Gwangju Institute of Science and Technology | Lee J.K.,Gwangju Institute of Science and Technology | Lee J.,Gwangju Institute of Science and Technology
Catalysis Today | Year: 2017

Catalytically active highly metallic palladium (A-I-Pd/C) catalyst for oxidation of formate (HCOO-) was synthesized via borohydride reduction method assisted by ammonia and iodine ion. The physico-chemical characterizations were conducted to investigate properties of the synthesized catalysts and we confirmed A-I-Pd/C is consisted with palladium hydride. The catalytic activity of the catalysts for oxidation of HCOO- are characterized by electrochemical analysis and A-I-Pd/C catalysts performed the best catalytic activity for oxidation of HCOO- in terms of Tafel slope and onset potential. The enhanced catalytic activity of A-I-Pd/C is explained by enhanced kinetics of oxidation of Hads, which is caused by weaken adsorption strength of Hads on Pd due to electron transfer from H to Pd. The enhanced performance of A-I-Pd/C was also confirmed and compared with the others in a single cell system. © 2017 Elsevier B.V.


Shin D.,Korea Advanced Institute of Science and Technology | Jeong B.,Korea Advanced Institute of Science and Technology | Mun B.S.,Ertl Center for Electrochemistry and Catalysis | Mun B.S.,Gwangju Institute of Science and Technology | And 6 more authors.
Journal of Physical Chemistry C | Year: 2013

Nitrogen-carbon (N-C) species is a potential electrocatalyst for oxygen reduction reaction (ORR) in electrochemical energy conversion cells, but its mechanistic origin of ORR on the N-C surface is still unclear. We show our facile approach to the synthesis of highly active Co-modified N-C catalyst and investigated the origin of ORR activity of electrospun N-C species by removing the metal with hydroxide carbon etching and acid metal leaching. Through the detailed investigation on the origin of ORR electrocatalysis for electrospun N-C nanofibers, we revealed that pyrrolic-N and highly graphitized carbon structure are mainly responsible for the enhanced ORR activity of metal-free N-C nanofiber and embedded Co metal got involved in the creation of the pyrrolic N site. © 2013 American Chemical Society.


Yang J.,China University of Mining and Technology | Song Y.,China University of Mining and Technology | Varela H.,University of Sao Paulo | Varela H.,Ertl Center for Electrochemistry and Catalysis | And 5 more authors.
Electrochimica Acta | Year: 2013

The adsorption of poisonous species on the catalyst surface impacts electrocatalytic reactions to different extents and by distinct means. The impact of adsorbing anionic species on electrocatalytic reactions has generally been investigated in the non-oscillatory regime or, at most, with temporal oscillations. Here, we report on spatiotemporal pattern formation in the electro-oxidation of sulfide on a platinum disk perturbed with dissolved chloride. The spatiotemporal dynamics was followed simultaneously with an electrochemical workstation and a charge-coupled device (CCD) camera. Perturbing the system with chloride results in (a) enhancement of dynamic instabilities throughout the current-potential curve, including regions of both positive and negative slope; (b) emergence of several spatial patterns; and (c) decreasing the width of pulses with increasing [Cl-]. The results are interpreted in terms of surface poisoning by chloride adsorption. © 2013 Elsevier Ltd. All rights reserved.

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