Comparative Study of Electrochemical CO2 Reduction Using Electrodes made of Metal Nanoparticles deposited on a Metal Substrate Vita Efelina1*, Kirana Qulsum3, Aulia Defitri Wulandari2, Muhammad Asharuddin2, Alvin Fariz1, Herman2, Fitrilawati3, and Rahmat Hidayat2*
1 Doctoral Program in Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung 40132, West Java, Indonesia
2 Physics of Magnetism and Photonics Research Division, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Jl. Ganesha 10, Bandung 40132, West Java, Indonesia
3 Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jalan Raya Bandung-Sumedang, Km 21 Jatinangor, Sumedang, West Java 45363, Indonesia
Abstract
Electrochemical reduction of carbon dioxide (CO2RR) is one of the straightforward methods to convert CO2 into valuable products or fuels while simultaneously reducing greenhouse gas emissions. Integration with solar or other renewable energy electricity may offer a promising pathway to a sustainable fuel economy. However, CO2RR occurs simultaneously with other reduction reactions, particularly the hydrogen evolution reaction (HER), which decreases the efficiency of CO2RR. In this presentation, we will report the investigation results on several electrodes made of metal nanoparticles deposited on a metal substrate for CO2RR. The Sn, Ni, and Cu nanoparticles were electrodeposited onto five different types of metal substrates, namely Cu, Sn, Ni, Zn, and stainless steel. CO2RR was carried out in 0.25 M KHCO3 electrolyte solution. The electrochemical performance of the electrodes was evaluated using cyclic voltammetry (CV) in a CO2-free and CO2-saturated electrolyte solution. The measurement results showed different electrocatalytic properties and CO2RR depending on the electrode, which is related to the suppression of the dominant HER reaction. The electrodes made of the combination of Cu and Sn showed a remarkable CO2RR current density in the CO2 saturated electrolyte solution, suggesting increased CO2RR activity. On the contrary, electrodes composed of Ni tended to promote more HER. These findings emphasise the crucial importance of selecting an appropriate electrode made of metal nanoparticles deposited on a metal substrate to improve the efficiency of CO2RR.
Keywords: CO2 electroreduction, CO2RR, cyclic voltammetry, hydrogen evolution reaction, metal nanoparticles.
