Janus Pt surfaces derivatized with zwitterionic molecules for oxygen reduction reactions in alkaline and acid electrolytes

Title
Janus Pt surfaces derivatized with zwitterionic molecules for oxygen reduction reactions in alkaline and acid electrolytes
Authors
정남기신혜영김만수장인준김형준장종현김형준유성종
Keywords
fuel cell; Oxygen reduction reaction; Zwitterionic moleclues; Bifunctional electrocatalyst
Issue Date
2015-10
Publisher
Nano energy
Citation
VOL 17, 152-159
Abstract
Direct electrostatic interactions between a charged Pt surface and oppositely charged spectator ions are utilized for the enhancement of oxygen reduction reaction (ORR) activity in both KOH and H3PO4 solutions. Zwitterionic L-cysteine molecules functionalized on a Pt surface are turned outwards to afford differing surface charges in either alkaline (−) or acid solutions (+). In KOH solution, this leads to the selective impediment of interactions between OH− and K+ with the Pt surface through repulsive and attractive interactions of the negatively charged –COO− group of L-cysteine, respectively. In H3PO4 solution, the phosphoric acid molecule and its anion are effectively captured by the positively charged –NH3+ moieties of L-cysteine. Behaviors of the spectator species hindering the ORR are systematically controlled through direct electrostatic interactions with the functional groups of L-cysteine in each electrolyte, resulting in a Janus Pt catalyst for superior ORR in both alkaline and acid electrolytes.
URI
http://pubs.kist.re.kr/handle/201004/50317
ISSN
22112855
Appears in Collections:
KIST Publication > Article
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