Abstract
The reduction of CO 2 to HCOOH has been studied for the Hg electrode in neutral and acidic aqueous solutions in the potential range between −0.8 and −1.9 V(sce). In the neutral pH range all the current is consumed in the production of formic acid, while in acid solutions both HCOOH and H 2 are produced. Steady-state polarization curves, cathodic galvanostatic charging curves. current-efficiency measurements, reaction orders with respect to CO 2 partial pressure, and double-layer variation have been used to determine possible reaction pathways. In neutral solutions the mechanism may be described by a direct reduction of CO 2 in which two consecutive charge-transfer steps occur. In acidic solutions the above process occurs in parallel with the reduction of H 3O + ions. The H atoms formed react in a branching mechanism either with H 3 O + ions and electrons to yield H 2, or with CO 2 to yield eventually HCOOH.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
