In Situ Topotactic Transformation of an Interstitial Alloy for CO Electroreduction

Changming Zhao, Gan Luo, Xiaokang Liu, Wei Zhang, Zhijun Li, Qian Xu, Qinghua Zhang, Huijuan Wang, Deming Li, Fangyao Zhou, Yunteng Qu, Xiao Han, Zezhou Zhu, Geng Wu, Jing Wang, Junfa Zhu, Tao Yao, Yafei Li, Henny J.M. Bouwmeester, Yuen Wu*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

8 Citations (Scopus)
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Abstract

Electrochemical reduction of CO to value-added products holds promise for storage of energy from renewable sources. Copper can convert CO into multi-carbon (C2+) products during CO electroreduction. However, developing a Cu electrocatalyst with a high selectivity for CO reduction and desirable production rates for C2+ products remains challenging. Herein, highly lattice-disordered Cu3N with abundant twin structures as a precursor electrocatalyst is examined for CO reduction. Through in situ activation during the CO reduction reaction (CORR) and concomitant release of nitrogen, the obtained metallic Cu° catalyst particles inherit the lattice dislocations present in the parent Cu3N lattice. The de-nitrified catalyst delivers an unprecedented C2+ Faradaic efficiency of over 90% at a current density of 727 mA cm−2 in a flow cell system. Using a membrane electrode assembly (MEA) electrolyzer with a solid-state electrolyte (SSE), a 17.4 vol% ethylene stream and liquid streams with concentration of 1.45 m and 230 × 10−3 m C2+ products at the outlet of the cathode and SSE-containment layer are obtained.

Original languageEnglish
Article number2002382
JournalAdvanced materials
Volume32
Issue number39
DOIs
Publication statusPublished - 1 Oct 2020

Keywords

  • CO electroreduction
  • Cu N
  • high concentration products streams
  • lattice dislocations
  • multi-carbon products

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