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<p>Electrochemical reduction of CO<sub>2</sub> into syngas (CO/H<sub>2</sub>) using renewable electricity is an emerging approach to achieve carbon neutrality. However, precise regulation of competing carbon dioxide reduction reaction (CO<sub>2</sub>RR) and hydrogen evolution reaction (HER) to tailor CO/H<sub>2</sub> ratios remains a formidable challenge. Here we prepared two different compositions of hetero-structures, such as ZnO/Zn(OH)<sub>2</sub> – Fe<sub>2</sub>O<sub>3</sub> and ZnO – Fe<sub>2</sub>O<sub>3</sub>, on carbon paper by electrodeposition, named as ZnFeO@CP-3 and ZnFeO@CP-4, and examined their electrocatalytic CO<sub>2</sub>RR ability to form syngas. The influence of applied potential on obtaining different compositions of Zn and Fe in the Zn-Fe-O electrocatalysts was investigated, and their subsequent impact on CO<sub>2</sub>RR performance was studied. We determined that higher deposition potential favored Zn-rich materials (ZnFeO@CP-4) and lower potentials favored greater incorporation of Fe in ZnFeO@CP-3. Among all electrodes, ZnFeO@CP-4 displayed an optimal performance, achieving a high syngas Faradaic efficiency (FE) of 98% with a CO/H<sub>2</sub> ratio of 3.9:1 at -1&#xa0;V vs. RHE. Apart from syngas formation, ZnFeO@CP-3 demonstrates high CO FE of 87% at -1.1&#xa0;V vs. RHE. The high selectivity towards CO formation highlights the versatility of Zn-Fe mixed oxide-hydroxide systems, which can further be tuned for targeted syngas or CO production.</p>

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Zinc iron oxide-hydroxide electrocatalysts for CO2 reduction to syngas

  • 期刊论文

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  • 发表日期：

    2026年3月3日

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  • Bibhudatta Malik,
  • Lama Younis,
  • Alina Sermiagin,
  • Hannah-Noa Barad

摘要

Electrochemical reduction of CO2 into syngas (CO/H2) using renewable electricity is an emerging approach to achieve carbon neutrality. However, precise regulation of competing carbon dioxide reduction reaction (CO2RR) and hydrogen evolution reaction (HER) to tailor CO/H2 ratios remains a formidable challenge. Here we prepared two different compositions of hetero-structures, such as ZnO/Zn(OH)2 – Fe2O3 and ZnO – Fe2O3, on carbon paper by electrodeposition, named as ZnFeO@CP-3 and ZnFeO@CP-4, and examined their electrocatalytic CO2RR ability to form syngas. The influence of applied potential on obtaining different compositions of Zn and Fe in the Zn-Fe-O electrocatalysts was investigated, and their subsequent impact on CO2RR performance was studied. We determined that higher deposition potential favored Zn-rich materials (ZnFeO@CP-4) and lower potentials favored greater incorporation of Fe in ZnFeO@CP-3. Among all electrodes, ZnFeO@CP-4 displayed an optimal performance, achieving a high syngas Faradaic efficiency (FE) of 98% with a CO/H2 ratio of 3.9:1 at -1 V vs. RHE. Apart from syngas formation, ZnFeO@CP-3 demonstrates high CO FE of 87% at -1.1 V vs. RHE. The high selectivity towards CO formation highlights the versatility of Zn-Fe mixed oxide-hydroxide systems, which can further be tuned for targeted syngas or CO production.