Browsing by Subject "CO2 conversion"

Now showing 1 - 4 of 4

Access status: Open Access ,
Electrodeposited copper-cuprite layers modified with rGO for light-supported conversion of $CO_{2}$ to methane and ethylene
(2025) Mech, Krzysztof; Kolbusz, Patrycja; Sławek, Andrzej; Marzec, Mateusz M.; Csapó, Edit
Akademickie Centrum Materiałów i Nanotechnologii
$Cu-Cu_{2}O-rGO$ composite layers were electrodeposited for the first time from alkaline copper(II) lactate-based electrolytes containing dispersed rGO flakes. The properties of electrodeposited composite materials are strongly affected by applied potentials. Obtained layers were investigated towards their catalytic activity in electro- and photoelectrochemical artificial $CO_{2}$-based synthesis of hydrocarbons. The effect of applied potential on the morphology, crystallographic structure, band gap, and conduction and valence band location was investigated. The catalytic performance of the electrodeposited layers was analyzed in $CO_{2}$-saturated $KHCO_{3}$ electrolyte under the dark and at light illumination applying different conversion potentials. The stability of the obtained layers was analysed based on XPS and XAS results. Maximal Faradaic efficiencies for methane and ethylene formation were achieved in the presence of light and amounted to 10 and 9.91%, respectively. Reported results indicate that the presence of rGO in deposited layers significantly affects the band structure of electrodeposited layers. It was also observed that even slight modification of electrodeposition or conversion potential results in noticeable differences in Faradaic efficiency corresponding to hydrocarbons formation.
Access status: Open Access ,
Electrodeposition of Cu-Cu2O composite films of adjustable band structure for photoelectrochemical conversion of carbon dioxide to hydrocarbons
(2024) Mech, Krzysztof; Podborska, Agnieszka; Marzec, Mateusz M.; Szaciłowski, Konrad; Ponce de Leon, Carlos
Akademickie Centrum Materiałów i Nanotechnologii
The electrodeposited $Cu-Cu_{2}O$ composite films were investigated in terms of their selectivity, efficiency, and stability in the electrochemical and photoelectrochemical conversion of $CO_{2}$ to hydrocarbons. Composite films were deposited at various potentials from an alkaline copper(II) lactate solution. The influence of electrode potential on the structure, morphology, and location of the valence and conduction bands was investigated. Finally, the catalytic activity of the materials was investigated in the dark and under illumination at various potentials in a $CO_{2}$-saturated $KHCO_{3}$ solution. Gas chromatography analysis indicated that maximum concentrations of $CH_{4}$ and $C_{2}H_{4}$ were observed under illumination and amounted to 13.37 and 8.99%, respectively. The highest Faradaic efficiencies for ethylene formation were observed at - 0.893 V vs. RHE, while for methane at - 0.893 V or 0.993 V, depending on the applied deposition potential. Performed studies indicated that at even relatively low conversion potentials, $Cu_{2}O$ may not be fully reduced to metallic copper and therefore affects the mechanism and kinetics of electrode reactions. Moreover, reported results indicated possibilities for controlling the selectivity toward the formation of hydrocarbons through proper selection of the composite synthesis conditions and conversion parameters as well.
Access status: Open Access ,
Energetyka a środowisko
(Wydawnictwa AGH, 2025) Burmistrz, Piotr; Gazda-Grzywacz, Magdalena; Górecki, Jerzy; Grzywacz, Przemysław; Motak, Monika; Olkuski, Tadeusz; Samojeden, Bogdan; Jacek Sobczyk, Eugeniusz; Sobczyk, Wiktoria; Styszko, Katarzyna; Szramowiat-Sala, Katarzyna; Uchmanowicz, Dominika
The chapter presents ways of producing energy in accordance with the idea of sustainable development. The implementation of European environmental policy through a circular economy is described. The importance of access to environmental data and modern measurement techniques in quantitative and qualitative analyses was emphasised. The benefits of using classical methods and deep and reinforcement learning techniques for modelling energy processes were indicated. The use of innovative catalytic and sorptive materials for waste gas purification and carbon dioxide conversion and management is discussed. The importance of identifying and quantifying critical points along the fuel value chain is demonstrated. The importance of investment and regulatory decisions in the decarbonisation process is presented.
Access status: Open Access ,
Exploring the frontiers of electrochemical $CO_{2}$ conversion: a comprehensive review
(2025) Ashraf, Shahid; Gohar, Osama; Khan, Muhammad Zubair; Tariq, Urooj; Ahmad, Jawad; Awan, Ramsha Javed; Zheng, Kun; Ur Rehman, Junaid; Abdul Karim, Muhammad Ramzan; Ishfaq, Hafiz Ahmad; Said, Zafar; Motola, Martin; Han, Ning; Hanif, Muhammad Bilal
Wydział Energetyki i Paliw
The electrochemical conversion of carbon dioxide into valuable products is pivotal for maintaining the global carbon cycle and mitigating global warming. This review explores the advancements in electrochemical $CO_{2}$ conversion, particularly focusing on producing methanol, ethanol, and n-propanol using various catalysts such as metals, metal oxides, metal alloys, and metal organic frameworks. Additionally, it covers the photoelectrochemical (PEC) conversion of $CO_{2}$ into alcohols. The primary objective is to identify efficient electrocatalysts for ethanol, methanol, and n-propanol production, prioritizing selectivity, stability, Faradaic efficiency (FE), and current density. Notable catalysts include PtxZn nanoalloys, which exhibit an FE of ∼81.4 % for methanol production, and trimetallic Pt/Pb/Zn nanoalloys, aimed at reducing Pt costs while enhancing catalyst stability and durability. Metal oxide catalysts like thin film $Cu_{2}O/CuO$ on nickel foam and $Cu_{2}O/ZnO$ achieve FE values of ∼38 % and ∼16.6 % for methanol production, respectively. Copper-based metal-organic frameworks, such as Cu@ $Cu_{2}O$, demonstrate an FE of ∼45 % for methanol production. Similarly, $Ag_{0.14}/Cu_{0.86}$ and Cu–Zn alloys exhibit FEs of ∼63 % and ∼46.6 %, respectively, for ethanol production. Notably, n-propanol production via Pd–Cu alloy and $graphene/ZnO/Cu_{2}O$ yields FEs of ∼13.7 % and ∼23 %, respectively. Furthermore, the review discusses recent advancements in PEC reactor design, photoelectrodes, reaction mechanisms, and catalyst durability. By evaluating the efficiency of these devices in liquid fuel production, the review addresses challenges and prospects in $CO_{2}$ conversion for obtaining various valuable products.