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Highly active oxygen evolution integrated with efficient CO2 to CO electroreduction.

Yongtao Meng1,2, Xiao Zhang2,3, Wei-Hsuan Hung2,4

  • 1College of Electrical Engineering and Automation, Shandong University of Science and Technology, 266590 Qingdao, China.

Proceedings of the National Academy of Sciences of the United States of America
|November 15, 2019
PubMed
Summary

A novel nickel-iron hydroxide carbonate (NiFe-HC) electrocatalyst efficiently converts CO2 to CO, overcoming challenges in oxygen evolution reactions for sustainable chemical fuel production.

Keywords:
CO2 electrolyzerCO2 reductionelectrocatalysisoxygen evolutionpH-neutral electrolyte

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Electrochemical reduction of carbon dioxide (CO2RR) is crucial for carbon cycling and environmental protection.
  • The oxygen evolution reaction (OER) is a critical bottleneck in CO2RR efficiency, requiring noble metal catalysts in neutral electrolytes.
  • Developing efficient and stable OER electrocatalysts is essential for advancing CO2 conversion technologies.

Purpose of the Study:

  • To develop a highly active and stable electrocatalyst for the oxygen evolution reaction (OER) in neutral electrolytes.
  • To investigate the electrochemical properties of anodized nickel-iron (NiFe) composite foam.
  • To integrate the novel OER catalyst with a CO2 reduction reaction (CO2RR) catalyst for efficient CO2 conversion.

Main Methods:

  • Anodization of a metallic Ni-Fe composite foam under specific harsh conditions (0.1 M KHCO3, 85 °C, ~250 mA/cm2).
  • Characterization of the resulting nickel-iron hydroxide carbonate (NiFe-HC) material, including its nanostructure and composition.
  • Electrochemical testing of NiFe-HC for OER activity and stability in CO2-saturated 0.5 M KHCO3.
  • Assembly and testing of a CO2 electrolyzer pairing NiFe-HC with a cobalt phthalocyanine/carbon nanotube (CoPc/CNT) CO2RR catalyst.

Main Results:

  • The anodization process transformed the NiFe foam into a porous NiFe-HC material with flower-like NiFe layer-double hydroxide (LDH) flakes.
  • The NiFe-HC electrode demonstrated superior OER activity compared to IrO2, with lower overpotentials (450 mV at 10 mA/cm2, 590 mV at 250 mA/cm2) and excellent stability (>120 h).
  • The integrated CO2 electrolyzer achieved selective CO2 to CO conversion with >97% Faradaic efficiency and a low cell voltage of 2.13 V at 10 mA/cm2, yielding a 59% electricity-to-chemical fuel efficiency.

Conclusions:

  • Anodizing NiFe composite foam under harsh conditions is an effective method to create a highly active and stable OER electrocatalyst (NiFe-HC).
  • NiFe-HC significantly outperforms noble metal catalysts like IrO2 in neutral electrolytes for OER.
  • The developed NiFe-HC catalyst enables efficient and selective electrochemical conversion of CO2 to CO, paving the way for sustainable fuel production.