Facile Preparation of Stable Ni II ‐ and Co II ‐Tetraaminophthalocyanine Electropolymers for Highly Efficient Heterogeneous Carbon Dioxide Reduction
Year: 2024
Type: article
Abstract: This study focused on preparation of stable polymer films of Ni II ‐ and Co II ‐tetraaminophthalocyanines, p‐NiTAPc and p‐CoTAPc , respectively, for highly efficient heterogeneous electrochemical carbon dioxide (CO 2 ) reduction in a flow electrolysis cell. Major development represented in this work was fabrication of p‐NiTAPc and p‐CoTAPc films via electropolymerization of their corresponding monomers on carbon‐based substrates without using binder or conducting additive materials to obtain efficient gas diffusion electrodes (GDEs) for scalable, productive and selective CO 2 ‐to‐CO conversion. The target polymers were characterized by UV‐visible spectrophotometry, attenuated total reflection‐Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X‐ray spectroscopy and cyclic voltammetry. According to controlled potential electrolysis and gas chromatography, p‐NiTAPc ‐catalyzed CO 2 reduction at −0.99 V vs . reversible hydrogen electrode (RHE) gave 953 mL of CO in a period of 16 hours with current density and Faradaic efficiency (FE) of 109±1 mA ⋅ cm −2 and 99±2 %, respectively. A p‐CoTAPc ‐modified GDE exhibited superior catalytic performance to the case of p‐NiTAPc in terms of catalyst stability and CO productivity by performing the continuous CO 2 reduction at the potential of −1.10 V vs . RHE for up to 41 hours and affording almost 3 times higher amount of CO with the current density of 161±5 mA⋅cm –2 and 95±2 % FE.
Source: ChemCatChem
Institutions: Chulalongkorn University, Johannes Kepler University of Linz
Language: English
Field: Energy
Domain: Physical Sciences
Open Access status: bronze
Awards: G140673900, G3432729142
OpenAlex ID: W4396618576