Evolution of silver to a better electrocatalyst: Water-assisted oxygen reduction reaction at silver chloride nanowires in alkaline solution
- 주제(키워드) Oxygen reduction reaction , Electrocatalysis , Silver halide , Nanowires , DFT calculation
- 주제(기타) Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied
- 설명문(일반) [Kim, Su-jin; Lee, Chongmok; Kim, Myung Hwa; Lee, Youngmi] Ewha Womans Univ, Dept Chem & Nano Sci, 52 Ewhayeodae Gil, Seoul 03760, South Korea; [Lee, Seung-Cheol] Korea Inst Sci & Technol, Elect Mat Res Ctr, 5 Hwarang Ro,14 Gil, Seoul 02792, South Korea
- 등재 SCIE, SCOPUS
- 발행기관 ELSEVIER SCIENCE BV
- 발행년도 2018
- URI http://www.dcollection.net/handler/ewha/000000151384
- 본문언어 영어
- Published As http://dx.doi.org/10.1016/j.nanoen.2018.03.041
초록/요약
Oxygen reduction reaction (ORR) is of great interest in various areas, including energy conversion. This paper presents the simple synthesis and characterization of one-dimensional silver halides nanowires (AgClNW and AgBrNW) as an electrocatalyst for ORR in alkaline media, as well as an investigation of the ORR pathway at AgCl. AgClNW and AgBrNW were prepared via a galvanic replacement reaction (GRR) between silver nanowires (AgNW) and a halide precursor. AgClNW exhibited excellent ORR catalytic activity that was comparable to or better than that for commercial Pt (20 wt% Pt loading on Vulcan carbon), demonstrating potential to replace Pt-based catalysts. A scanning electrochemical microscopy (SECM) analysis supports the existence of an associative ORR pathway at AgCl, and first-principles density functional theory (DFT) calculations suggest that the high ORR activity of AgCl is possibly attributed to the up-shifted Ag d-band center energy in AgCl as well as the assistance of adsorbed water molecules.
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