10.1021/acsenergylett.9b00975.s002
Yuguang
C. Li
Yuguang
C.
Li
Geonhui Lee
Geonhui
Lee
Tiange Yuan
Tiange
Yuan
Ying Wang
Ying
Wang
Dae-Hyun Nam
Dae-Hyun
Nam
Ziyun Wang
Ziyun
Wang
F. Pelayo García de Arquer
F.
Pelayo García de Arquer
Yanwei Lum
Yanwei
Lum
Cao-Thang Dinh
Cao-Thang
Dinh
Oleksandr Voznyy
Oleksandr
Voznyy
Edward H. Sargent
Edward H.
Sargent
CO<sub>2</sub> Electroreduction from Carbonate Electrolyte
American Chemical Society
2019
syngas product stream
CO 2 release
CO 2 electrolysis
CO 2
CO 2 Electroreduction
upgrades carbonate electrolyte
CO 2 conversion technologies
2019-05-24 00:00:00
Media
https://acs.figshare.com/articles/media/CO_sub_2_sub_Electroreduction_from_Carbonate_Electrolyte/8204594
The
process of CO<sub>2</sub> valorizationfrom capture
of CO<sub>2</sub> to its electrochemical upgraderequires significant
inputs in each of the capture, upgrade, and separation steps. Here
we report an electrolyzer that upgrades carbonate electrolyte from
CO<sub>2</sub> capture solution to syngas, achieving 100% carbon utilization
across the system. A bipolar membrane is used to produce proton in
situ to facilitate CO<sub>2</sub> release at the membrane:catalyst
interface from the carbonate solution. Using a Ag catalyst, we generate
syngas at a 3:1 H<sub>2</sub>:CO ratio, and the product is not diluted
by CO<sub>2</sub> at the gas outlet; we generate this pure syngas
product stream at a current density of 150 mA/cm<sup>2</sup> and an
energy efficiency of 35%. The carbonate-to-syngas system is stable
under a continuous 145 h of catalytic operation. The work demonstrates
the benefits of coupling CO<sub>2</sub> electrolysis with a CO<sub>2</sub> capture electrolyte on the path to practicable CO<sub>2</sub> conversion technologies.