Boosted Electron-Transfer Kinetics of Hydrogen Evolution Reaction at Bimetallic RhCo Alloy Nanotubes in Acidic Solution
- 주제(키워드) alloy nanotubes , rhodium , cobalt , hydrogen evolution reaction , electrocatalysis
- 주제(기타) Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
- 설명문(일반) [Yu, Areum; Kim, So Yeon; Lee, Chongmok; Kim, Myung Hwa; Lee, Youngmi] Ewha Womans Univ, Dept Chem & Nano Sci, Seoul 03760, South Korea
- 등재 SCIE, SCOPUS
- 발행기관 AMER CHEMICAL SOC
- 발행년도 2019
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000165845
- 본문언어 영어
- Published As http://dx.doi.org/10.1021/acsami.9b16892
- PubMed https://pubmed.ncbi.nlm.nih.gov/31815407
초록/요약
RhCo alloy nanotubes were synthesized via the reduction of single-phase Co2RhO4 nanotubes. The reduction was conducted by thermal annealing of the Co2RhO4 nanotubes under hydrogen gas flow. The crystallinity of the prepared RhCo alloy nanotubes depended on the reduction temperature: amorphous phase (200 degrees C reduction) and the crystalline phase (300 degrees C reduction). The hydrogen evolution reaction (HER) on RhCo alloys was investigated with voltammetry in 1.0 M HClO4 solution. Amorphous RhCo alloys provided lower overpotential than the crystalline counterpart despite their similar morphology and composition. Of great interest, amorphous RhCo alloy nanotubes exhibited an outstanding HER electroactivity verified with a low overpotential at -10 mA cm(-2) (-22 mV) and a small Tafel slope (-24.1 mV dec(-1)), outperforming commercial Pt, pure Rh metal, and the other previously reported Rh-based catalysts. This excellent HER activity of amorphous RhCo nanotubes was attributed to the amorphous structure having a large electrochemical surface area and maximized Rh-Co interfaces in the alloy facilitating HER Active but expensive Rh alloyed with less active but cheap Co was successfully demonstrated as a potential cost-effective HER catalyst.
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