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Effect of catalyst layer on electrochemical reduction of carbon dioxide using different morphologies of copper
Journal of CO2 Utilization ( IF 7.7 ) Pub Date : 2018-08-24 , DOI: 10.1016/j.jcou.2018.07.020
Karan Malik , Nardev Kumar Bajaj , Anil Verma

Electrochemical reduction of carbon dioxide (ERC) is one of the promising technologies for the renewable energy storage challenge and mitigation of the CO2 levels. Till now Cu has been found the best electrocatalyst for ERC but still the potential of Cu is not fully explored. This paper illustrates the effect of electrocatalyst layer formed by four different morphologies of cupper (nanorods, octahedral, spherical, and dendrite) with similar crystallite phases. Pre and post-ERC analysis of the catalyst in different environment shows that same crystal facet is formed at the end of ERC, indicating that the crystal rearrangement occurred during ERC is independent of the environment and does not promote any particular reaction. Nanorods form intercalated layers with an extended surface giving maximum faradaic efficiency of 26% at a lower cell voltage of −2.75 V. Dendrites forms porous layers, which are filled by the gas formed during ERC and thus decreases the active surface. However, the entrapped intermediates provide sufficient residence time and conditions for C2H4 and C2H6 formation. Spherical nanoparticles and octahedral nanoparticles formed a smooth, and thin layer with minimum faradaic efficiency towards ERC.



中文翻译:

催化剂层对不同形态铜的电化学还原二氧化碳的影响

二氧化碳的电化学还原(ERC)是可再生能源存储挑战和减少CO 2的有前途的技术之一水平。到目前为止,铜已被发现是ERC的最佳电催化剂,但仍未充分挖掘铜的潜力。本文说明了由具有相似微晶相的四种不同形态的铜(纳米晶,八面体,球形和枝晶)形成的电催化剂层的作用。在不同环境中对催化剂进行的ERC前后分析表明,在ERC末端形成了相同的晶面,这表明ERC期间发生的晶体重排与环境无关,并且不会促进任何特定的反应。纳米棒形成插入层,该插入层具有延伸的表面,在-2.75 V的较低电池电压下,其最大法拉第效率为26%。树枝状晶体形成多孔层,这些多孔层被ERC期间形成的气体填充,从而降低了活性表面。然而,2 H 4和C 2 H 6的形成。球形纳米颗粒和八面体纳米颗粒形成光滑薄层,对ERC的法拉第效率最低。

更新日期:2018-08-24
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