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首页> 外文期刊>Nanotechnology >Tailoring gas-phase CO2 electroreduction selectivity to hydrocarbons at Cu nanoparticles
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Tailoring gas-phase CO2 electroreduction selectivity to hydrocarbons at Cu nanoparticles

机译：在Cu纳米粒子上剪裁气相二氧化碳电荷选择性对烃的选择性

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摘要

Copper-based surfaces appear as the most active catalysts for CO2 electroreduction to hydrocarbons, even though formation rates and efficiencies still need to be improved. The aim of the present work is to evaluate the continuous gas-phase CO2 electroreduction to hydrocarbons (i.e. ethylene and methane) at copper nanoparticulated-based surfaces, paying attention to particle size influence (ranging from 25-80 nm) on reaction productivity, selectivity, and Faraday efficiency (FE) for CO2 conversion. The effect of the current density and the presence of a microporous layer within the working electrode are then evaluated. Copper-based gas diffusion electrodes are prepared by airbrushing the catalytic ink onto carbon supports, which are then coupled to a cation exchange membrane (Nafion) in a membrane electrode assembly. The results show that the use of smaller copper nanoparticles (25 nm) leads to a higher ethylene production (1148 mu mol m(-2) s(-1)) with a remarkable high FE (92.8%), at the same time, diminishing the competitive hydrogen evolution reaction in terms of FE. This work demonstrates the importance of nanoparticle size on reaction selectivity, which may be of help to design enhanced electrocatalytic materials for CO2 valorization to hydrocarbons.
机译：即使需要改善形成速率和效率，铜基表面也显示为CO2电氧化合物的最活性催化剂。本作本作作品的目的是评价铜纳米颗粒的表面上的连续气相二氧化碳电 - 碳氢化合物（即乙烯和甲烷），注意粒度影响（25-80nm）对反应生产率，选择性和FE2转换的法拉第效率（FE）。然后评价当前密度和在工作电极内的微孔层的效果。通过将催化墨水喷涂到碳载体上来制备铜基气体扩散电极，然后将其偶联到膜电极组件中的阳离子交换膜（Nafion）。结果表明，使用较小的铜纳米粒子（25nm）导致更高的乙烯生产（1148μmMolm（-2）s（-1）），同时具有显着的高Fe（92.8％），在Fe方面减少竞争性氢气进化反应。这项工作证明了纳米粒子尺寸对反应选择性的重要性，这可能有助于设计增强的CO 2载物的电催化材料对烃。

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