CuIr Nanoparticles for Electrochemical Reduction of CO2 to t-BuOH

Myeong Geun Kim, Jinwoo Park, Youngjo Choi, Ho Chang Song, Seung Hoon Kim, Kyeong Mi Bang, Hyung Chul Ham, Nak Kyoon Kim, Da Hye Won, Byoung Koun Min, Sung Jong Yoo, Woong Kim

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Recent advances in electrocatalysts for the CO2 reduction reaction (CO2RR) have led to several promising results, including the large-scale production of low-carbon fuels. One of the next steps in this route is the generation of economically and scientifically valuable multicarbon (e.g., C4) chemicals. However, this process has rarely been reported to-date and has generally suffered from a low production rate (jpartial ≤ 0.097 mA cm−2) and Faradaic efficiency (FE) of ≤ 1%. This is largely due to the lack of efficient electrocatalysts for the complicated and interconnected reaction pathway of C4 generation. Herein, CuxIr1–x alloy nanoparticles (NPs) are shown to convert CO2 into (CH3)3COH (t-BuOH) with a jpartial of 0.207 mA cm–2 at a FE of 14.8%, which is the best performance toward C4 production demonstrated so far. Furthermore, this study proposes a probable mechanism of C4 formation based on density functional theory (DFT) calculations. The findings suggest that the C4 production is facilitated by the strong electronic interaction between Cu and Ir and the high oxophilicity of the Ir-rich surface, which enhances the binding strength of oxygen-bound intermediates. This work opens the potential of Ir-based alloys for the CO2RR and highlights the production of C4 chemicals beyond the currently available C1–C3 products.

Original languageEnglish
Article number2300749
JournalAdvanced Energy Materials
Volume13
Issue number22
DOIs
Publication statusPublished - 2023 Jun 9

Bibliographical note

Funding Information:
This research was supported by the National Research Council of Science and Technology (NST) grant by the Korean government (MSIT) (No. CAP21012‐102), the New & Renewable Energy Core Technology Program of KETEP (20203020030010) in Korea, and the Korea University

Publisher Copyright:
© 2023 Wiley-VCH GmbH.

Keywords

  • carbon dioxide reduction
  • copper alloys
  • iridium
  • multicarbon productions
  • t-BuOH

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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