Electroreduction of <scp> CO ₂ </scp> to <scp> CH ₄ </scp> without overpotential using <scp>Pt‐black</scp> catalysts: Enhancement of faradaic efficiency

The use of metal electrocatalysts (Cu, Au, and Ag) is the mainstream in primary CO2 reduction systems, but their large overpotential induces a decrease energy conversion efficiency. Recently, it has been discovered that carbon-supported Pt can make game change to reduce CH4 electrocatalytically without overpotential; however, its faradaic efficiency remains only 12.3% thus far. One approach investigate role carbon supports for improving In this study, improved was carried out by employing Pt-black electrocatalyst support polymer electrolyte membrane electrolyzer cell. When supplying diluted Ar gas at concentrations 4-7 vol.%, efficient generation observed. reason behind production occurs Langmuir-Hinshelwood mechanism associated with adsorbed CO (COads) H (Hads) on electrocatalyst. Moreover, high-density COads environment (surface) be created catalyst, achieving 23.2% 0.18 V vs RHE. Therefore, study succeeded from using