Scalable fabrication of high activity nanoporous copper powders for electrochemical CO2 reduction via ball milling and dealloying
Scalable fabrication of high activity nanoporous copper powders for electrochemical CO2 reduction via ball milling and dealloying
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DOI：
10.1016/j.jcou.2021.101454
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发表时间：
2021-01-23
影响因子：
7.7
通讯作者：
Biener, Juergen
中科院分区：
文献类型：
--
作者：
Qi, Zhen;Biener, Monika M.;Biener, Juergen
电化学CO2还原（ECR）是利用可再生能源关闭人为CO2循环以实现碳中和的一种很有前途的技术。ECR的未来商业化将需要开发新的催化剂合成路线，这将使催化剂的生产规模从目前的研究级毫克级大幅提升到公斤级甚至更高，同时保持研究级的活性和选择性。在这项工作中，我们报告了使用一种可扩展的方法来生成和测试亚微米尺寸的纳米多孔铜（npCu）颗粒，该方法包括球磨脆性铜基金属间化合物，然后合金化以增加纳米孔隙度以获得高表面积。所得到的npCu颗粒已经在工业相关的大面积（25 cm2）电解槽平台上进行了测试，结果表明，在75-100 mA/cm2的电流密度下，乙烯的法拉第效率（FE）高达34%，而氢的FE保持在30%以下。我们的研究结果表明，球磨和合金化的结合是一种有前途的方法，可以在工业相关规模上为ECR生产大量高活性和高表面积的npCu颗粒。
Electrochemical CO2 reduction (ECR) is a promising technology to close the anthropic CO2 circle using renewable energy to achieve carbon neutrality. Future commercialization of ECR will require the development of new catalyst synthesis routes that will allow significant upscaling of catalyst production from current research-level milligram quantities to the kilogram scale and beyond while maintaining the activity and selectivity demonstrated at the research level. In this work, we report on generating and testing submicron-sized nanoporous copper (npCu) particles by using a scalable approach consisting of ball milling brittle Cu-based intermetallics followed by dealloying to add nanoporosity for high surface area. The resulting npCu particles have been tested in an industry-relevant large area (25 cm2) electrolyzer platform and showed Faraday efficiencies (FE) for ethylene up to 34 % at current densities of 75-100 mA/cm2 while keeping FE for hydrogen less than 30 %. Our results demonstrate that a combination of ball milling and dealloying is a promising approach to generate large quantities of high activity and high surface area npCu particles for ECR at an industry-relevant scale.