https://scholars.lib.ntu.edu.tw/handle/123456789/598867
標題: | Effect of Dealloying Time and Post-Annealing on the Surface Morphology and Electrocatalytic Behavior of Nanoporous Copper Films for CO2Reduction Reaction | 作者: | Zeng W.-Y Lai J.-H Cheng I.-C. I-Chung Cheng |
關鍵字: | Annealing;Carbon dioxide;Copper;Copper oxides;Dealloying;Electrocatalysts;Film preparation;Formic acid;Global warming;Greenhouse gases;Morphology;Nanosheets;X ray photoelectron spectroscopy;Copper films;Electrochemical surface area;Faraday efficiency;Ligament sizes;Morphology behavior;Nano-porous coppers;Nanosheet structure;Postannealing;Reduction reaction;Surface morphology | 公開日期: | 2021 | 卷: | 168 | 期: | 12 | 來源出版物: | Journal of the Electrochemical Society | 摘要: | Electrocatalytic reduction reaction of CO2 (CO2RR) is one of the promising routes to mitigate global warming via transforming greenhouse gas into valuable chemical feedstocks. By adding proper electrocatalysts, such as nanoporous copper (NPC) with an average ligament size of 37 ± 6 nm, hydrocarbons could be produced at a relatively low overpotential. As the dealloying time increased to 156 h, the NPC was transformed into CuO nanosheet structure, which yielded larger electrochemical surface area (ECSA) and current density than the as-prepared NPC films. However, the Faraday efficiency (FE) of the major conversion product, formic acid (HCOOH), decreased from 29 to 8% when the nanosheet structure was used as electrocatalyst. On the other hand, the surface morphology of the NPC films remained similar while the average ligament size increased from 37 to 63 nm after a post-annealing treatment at 500 °C for 4 h. Both the current density and ECSA of this post-annealed NPC film were nearly 3 times higher than those of as-prepared NPC film, and the FE toward HCOOH increased from 29 to 45%. X-ray photoelectron spectroscopy and Raman spectroscopy revealed that Cu2O were present on the nanoporous structure, which enhanced the selectivity and FE toward HCOOH in CO2RR. ? 2021 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85121765648&doi=10.1149%2f1945-7111%2fac393c&partnerID=40&md5=913ef0f863cc1383f85445e1574d8b17 https://scholars.lib.ntu.edu.tw/handle/123456789/598867 |
ISSN: | 00134651 | DOI: | 10.1149/1945-7111/ac393c |
顯示於: | 機械工程學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。