Porous Hollow Fiber Nickel Electrodes for Effective Supply and Reduction of Carbon Dioxide to Methane through Microbial Electrosynthesis
AuthorsAlQahtani, Manal Faisal
KAUST DepartmentAdvanced Membranes and Porous Materials Research Center
Biological and Environmental Sciences and Engineering (BESE) Division
Chemical Engineering Program
Environmental Biotechnology Research Group
Environmental Science and Engineering Program
Physical Science and Engineering (PSE) Division
Water Desalination and Reuse Research Center (WDRC)
KAUST Grant NumberURF/1/2985-01-01
Online Publication Date2018-09-06
Print Publication Date2018-10
Permanent link to this recordhttp://hdl.handle.net/10754/628529
MetadataShow full item record
AbstractMicrobial electrochemical reduction of CO2 gas to value-added chemical products requires the development of an electrode architecture with a three-phase interface for efficient mass transport. A hybrid bioinorganic system for CO2 reduction to CH4 is developed by coupling a new electrode architecture with enriched methanogenic community. The novel electrode design consists of porous nickel hollow fibers, which act as an inorganic electrocatalyst for hydrogen generation from proton reduction and as a gas-transfer membrane for direct CO2 delivery to CO2-fixing hydrogenotrophic methanogens (biological catalyst) on the cathode through the pores of the hollow fibers. These unique features of the electrode create a suitable environment for the enrichment of methanogens, which utilize the hydrogen as a source of reducing equivalents for the conversion of CO2 to CH4. The performance of the nickel electrode is tested in microbial electrosynthesis cells operated at cathode potential of −1 V versus Ag/AgCl, achieving high faradaic efficiency of 77% for CH4. The superior performance of the hybrid bioinorganic system is attributed to the electrode architecture, which provides a three-phase boundary for gas–liquid reactions, with the reactions supported by the inorganic and biological catalysts.
CitationAlqahtani MF, Katuri KP, Bajracharya S, Yu Y, Lai Z, et al. (2018) Porous Hollow Fiber Nickel Electrodes for Effective Supply and Reduction of Carbon Dioxide to Methane through Microbial Electrosynthesis. Advanced Functional Materials: 1804860. Available: http://dx.doi.org/10.1002/adfm.201804860.
SponsorsThis work was supported by Competitive Research Grant (URF/1/2985-01-01) from King Abdullah University of Science and Technology. The authors thank Dr. Srikanth Pedireddy for generating Scheme 1, Figure S4 (Supporting Information), and ToC. Additionally, the authors acknowledge Hyun Ho Hwang (Heno) at the Office of Academic Writing Services at KAUST for generating Figure 2 in the manuscript.
JournalAdvanced Functional Materials