Development of Bifunctional Electrocatalysts for the Electrochemical Reduction of CO2 Coupled with Lignin Oxidation to Produce Value-Added Products

• Grant number: 24/18459-4
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: August 01, 2025
• End date: July 31, 2028
• Field of knowledge: Engineering - Sanitary Engineering - Water Supply and Wastewater Treatment
• Principal Investigator: Marcos Roberto de Vasconcelos Lanza
• Grantee: Marciélli Karoline Rodrigues de Souza
• Host Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Associated research grant: 22/12895-1 - Advanced processes for the degradation of emerging pollutants: catalytic materials, electroanalytical sensors and scientific dissemination, AP.TEM

Abstract

The rising consumption of fossil fuels, along with human-induced CO2 emissions, has led to the current challenges of global warming and energy crisis. One promising approach to achieving carbon neutrality is the electrochemical reduction of CO2 (RRCO2). This project aims to develop efficient and selective bifunctional catalysts for RRCO2, focusing on fuels like methanol and ethanol. Using a straightforward hydrothermal method, we will synthesize these electrocatalysts from transition metals such as Ni, Co, Cu, and Fe supported on graphene nanoribbons. To enhance the economic viability of the process, we will integrate lignin oxidation (ROL) to produce valuable chemicals. In a continuous flow reactor, we will explore variables such as pH, potential, and reactant flow rates to optimize energy efficiency and Faradaic efficiency. The materials will undergo electrochemical characterization, and a comprehensive analysis of their composition, morphology, chemical nature, and crystallinity will provide insights into their catalytic performance, including selectivity and stability. Through the development of this bifunctional system, we aim to achieve high yields of valuable and highly selective products, utilizing electrodes with greater current densities that are more resistant to leaching, while also ensuring their reusability and stability at lower overall cell voltages. The technological advancements from this project could lead to patentable solutions that may be commercially viable for São Paulo companies looking to reduce their carbon emissions and access valuable products.