Operando X-ray characterization platform to unravel catalyst degradation under accelerated stress testing in CO2 electrolysis

Author:

Drnec Jakub1ORCID,Xu Qiucheng2ORCID,Zeledón José Zamora3,Joensen Bjørt Óladóttir2,Trotochaud Lena3ORCID,Sartori Andrea1,Kaas Lau4,Moss Asger2ORCID,Mirolo Marta1,Mairena Luis3,Huynh Sylvia3,Garg Sahil2,Helveg Stig4,Chorkendorff Ib2,Zhao Shuai3,Seger Brian4ORCID

Affiliation:

1. ESRF

2. Department of Physics, Technical University of Denmark

3. Twelve Benefit Corporation

4. Technical University of Denmark

Abstract

Abstract

Membrane-electrode assembly (MEA)-based CO2 electrolysis technology has a promising future to realize the industrial-scale production of diverse value-added chemical commodities. One crucial metric for CO2 electrolysis is stability. However, comprehensive but distinguishable degradation mechanisms of catalyst and electrode in the MEA are still missing when assembled in the electrolyzer. Herein, a customized operando synchrotron X-ray characterization platform was first established to track the time- and space-resolved evolution of ions and water movements, crystal structure, and particle size of the catalyst in the entire MEA. Based on the model catalysts of Au and Ag, we reveal that the crystalline phase stability of catalyst and catalyst-substrate interaction together determine cathode durability. The D-ratio (i.e., diameter ratio achieved from a deep analysis of small/wide angle X-ray scattering) is a good descriptor to evaluate the structure stability of catalyst on electrode. Au catalysts with a more stable crystal structure and strong catalyst-substrate interaction possess a smaller D-ratio change as well as a better durability under a pulse-driven accelerated stress test in contrast to Ag catalysts, which degrade due to agglomeration and Ostwald ripening. This work demonstrates the broad capability of the newly developed operando X-ray characterization platform to unveil catalyst and electrode degradation in MEA-based devices.

Publisher

Springer Science and Business Media LLC

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3