纳米结构铜薄膜电极的CO2电还原制C2+产品

IF 5.1 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Nanoscale Pub Date : 2025-07-03 DOI:10.1039/D5NR01514F
Dimitra Papamichail, Filippo Franceschini, Imran Abbas, Deema Balalta, Trang Thi Hong Nguyen, Deepak Pant, Sara Bals, Irene Taurino, Ewald Janssens, Didier Grandjean and Peter Lievens
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引用次数: 0

摘要

电化学CO2还原反应(CO2RR)是实现化学工业碳中和过程的一种很有前途的方法。在这种情况下,各种纳米结构已经被报道可以提高cu基催化剂的C2+选择性。本文以300 nm溅射Cu薄膜为材料,在不同的阳极氧化条件下制备了Cu纳米针(NN),并研究了其调节C2+产物选择性的性能。阳极氧化电位(+0.75 VRHE, +0.85 VRHE和+0.95 VRHE)和KOH电解质浓度(0.1 M, 0.5 M和1.0 M)的各种组合允许调整神经网络的长度和密度,这些神经网络的长度和密度与它们在-1.0 VRHE下的CO2RR产物选择性纠缠在一起。使用C2+:C1比例时,神经网络表面密度高,性能最佳。利用高角环形暗场扫描透射电子显微镜和x射线吸收精细结构光谱对表现最好的样品进行了详细分析,结果表明,Cu薄膜阳极氧化后形成由2nm氢氧化物纳米粒子(NPs)组成的均匀三维网络,并在CO2RR后重建成粗糙的金属Cu NP网络。具有这种内部结构的高密度神经网络可能导致局部CO浓度的增加,从而导致C2+产物的增加。本系统的研究表明,纳米结构的铜薄膜电极表面可以提高CO2RR对C2+产物的选择性,而神经网络的形态和内部结构之间的相关性进一步加强了其作为CO2电催化剂的应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Nanostructuring copper thin film electrodes for CO2 electroreduction to C2+ products†

Nanostructuring copper thin film electrodes for CO2 electroreduction to C2+ products†

The electrochemical CO2 reduction reaction (CO2RR) is a promising approach for achieving carbon-neutral processes in the chemical industry. In this context, various nanostructures have been reported to enhance the C2+ selectivity of Cu-based catalysts. Here, we prepared Cu nanoneedles (NN) from 300 nm sputtered Cu thin films through anodization under various conditions and investigated their performance in terms of C2+ product selectivity. Various combinations of anodization potentials (+0.75 VRHE, +0.85 VRHE, and +0.95 VRHE) and KOH electrolyte concentrations (0.1 M, 0.5 M and 1.0 M) allow the tailoring of the NN length and density that are linked to their CO2RR product selectivity at −1.0 VRHE. The best performance using the C2+ : C1 ratio was achieved with a high NN surface density. A detailed analysis using high-angle annular dark-field scanning transmission electron microscopy and X-ray absorption fine structure spectroscopy of the best performing sample shows that the anodization of a Cu thin film produces NNs composed of a uniform 3D network of 2 nm hydroxide nanoparticles (NPs) and reconstructs into a rougher metallic Cu NP network after the CO2RR. A high density of NNs with this inner structure may lead to an increase in the local CO concentration and thus to C2+ products. This systematic work demonstrates that nanostructuring the surface of copper thin film electrodes can enhance the CO2RR selectivity to C2+ products while the correlation between the NN morphology and their inner structure strengthens further their applications as CO2 electrocatalysts.

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来源期刊
Nanoscale
Nanoscale CHEMISTRY, MULTIDISCIPLINARY-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
12.10
自引率
3.00%
发文量
1628
审稿时长
1.6 months
期刊介绍: Nanoscale is a high-impact international journal, publishing high-quality research across nanoscience and nanotechnology. Nanoscale publishes a full mix of research articles on experimental and theoretical work, including reviews, communications, and full papers.Highly interdisciplinary, this journal appeals to scientists, researchers and professionals interested in nanoscience and nanotechnology, quantum materials and quantum technology, including the areas of physics, chemistry, biology, medicine, materials, energy/environment, information technology, detection science, healthcare and drug discovery, and electronics.
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