Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 759, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.143575
Keywords
Carbon dioxide; Electrochemical reduction; Formate; Nitrogen-doped porous carbon; Digested sludge
Categories
Funding
- National Natural Science Foundation of China [21777121]
- National Key Research and Development Program of China [2019YFC1906304]
- Fundamental Research Funds for the Central Universities [22120180062]
Ask authors/readers for more resources
Carbon-based materials have been successfully utilized as cost-effective electrocatalysts to reduce carbon dioxide into valuable chemicals. In this study, nitrogen-doped porous carbons (NPCs) were obtained from digested sludge and used as a metal-free electrocatalyst for the electrochemical reduction of CO2 to formate. The synthesized material exhibited high efficiency and specific pathways for CO2 conversion.
Carbon-based materials have been applied as cost-effective electrocatalysts to reduce carbon dioxide (CO2) into valuable chemicals. Here, an environment-friendly method is proposed to obtain nitrogen-doped porous carbons (NPCs) from digested sludge, which is an abundant waste product from sewage treatment plants. The materials were used as a metal-free electrocatalyst for electrochemical reduction of CO2 to formate. The synthesized material (NPC-600) had a mesoporous and microporous structure with a specific surface area of 246.21 m(2) g(-1) and pore volume of 0.494 cm(3) g(-1). Active sites based on nitrogen atoms accounted for 2.98 atom% of the content and included pyrrolic-, pyridinic-, and graphitic-N, which is useful for CO2 adsorption and electron transfer in electrochemical reduction. The Faradaic efficiency for formate production from CO2 in the presence of NPC-600 was 68% at the potential of -1.5 V vs. SCE. Tafel analysis indicated that the pathway of CO2 conversion involved the reduction of CO2 to CO2*- intermediate, which was then converted to HCOO*- and finally formate. (C) 2020 Published by Elsevier B.V.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available