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Synthesis and catalytical properties of hierarchical nanoporous copper from θ and η phases in CuAl alloys
Journal of Physics and Chemistry of Solids ( IF 4.3 ) Pub Date : 2020-12-24 , DOI: 10.1016/j.jpcs.2020.109915
Yan-Rung Su , Tung-Hua Wu , I-Chung Cheng

Greenhouse gases, such as carbon dioxide, have a great impact on global warming and climate change. CO2 trapping and reduction have been one of the solutions to slow down the temperature rise. Copper has proven to be an effective electrocatalyst to transform CO2 into useful organic compounds, such as CH4, C2H4, and HCOOH. Here, nanoporous copper (NPC), that are synthesized from various precursor phases of Cu–Al alloys, like pure Al solid solution α, CuAl2 θ and CuAl η phases, with different relative densities and ligament sizes are being used as electrocatalyst for CO2 reduction reaction (CO2RR). The ligament sizes of the NPCs can be adjusted with the use of dealloying solution, either in HCl or NaOH, and dealloying temperatures. In this study, the ligament sizes were available from the range of 51–116 nm. A hierarchical structure containing a lamellar eutectic structure with an interlayer spacing of 6 μm in the parent phases is observed from NPC synthesized from Cu18Al82. The results show that the current density of CO2RR using NPC as electrocatalyst is 2–5 times higher than that of using copper foil. The ligament size effect is more obvious than the relative density effect since the peak current density was obtained from the NPC with ligament size of 76 nm. The product distribution suggested that NPC with hierarchical structure has higher Faraday efficiency of ethylene than conventional NPC or Cu foil at high overpotential.



中文翻译:

CuAl合金中θ和η相的多级纳米多孔铜的合成及催化性能

二氧化碳等温室气体对全球变暖和气候变化具有重大影响。捕获和还原CO 2已成为减缓温度上升的解决方案之一。事实证明,铜是将CO 2转化为有用的有机化合物(例如CH 4,C 2 H 4和HCOOH)的有效电催化剂。在这里,由Cu-Al合金的各种前驱物相(如纯Al固溶体α,CuAl 和CuAlη相)合成的具有不同相对密度和韧带尺寸的纳米孔铜(NPC)被用作CO的电催化剂。2还原反应(CO 2RR)。NPC的韧带尺寸可通过使用HCl或NaOH中的脱合金溶液和脱合金温度进行调节。在这项研究中,韧带的大小范围为51–116 nm。从Cu 18 Al 82合成的NPC观察到母体相中层间共层间隔为6μm的层状共晶结构的分层结构。结果表明,CO 2的电流密度使用NPC作为电催化剂的RR比使用铜箔的RR高2-5倍。韧带尺寸效应比相对密度效应更明显,因为峰值电流密度是从韧带尺寸为76 nm的NPC获得的。产品分布表明,在高超电势下,具有分层结构的NPC具有比常规NPC或Cu箔更高的乙烯法拉第效率。

更新日期:2020-12-31
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