Abstract
In-situ resource utilization technology(ISRU) is the key technology for human beings to go out of the earth and realize deep space exploration. As an important resource in outer space, CO2 can be reduced to produce O2 and fuel. In this paper, the reduction of CO2 by ISRU is studied. Artificial photoelectrocatalytic synthesis technology is applied through a microfluidic device to realize the generation of O2 and the production of organic substances in extraterrestrial space. A multi-physical field coupled mathematical model was established for the reduction of CO2 in electrochemical catalytic reaction. The flow and diffusion of gas-liquid two-phase flow in microchannel was studied, and the mechanism of mass transfer and chemical reaction in microscale was analyzed. The gas-liquid mass transfer performance during electrochemical reaction was studied, and the effects of microchannel structure parameters on mass transfer were analyzed.
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Abbreviations
- \(\rho\) [kg/m3]:
-
density;
- t [s]:
-
time;
- \(\vec{u}\) [m/s]:
-
the velocity vector;
- \(\varphi\) [-]:
-
the volume fraction;
- \(p\) [Pa]:
-
pressure;
- \(\mu\) [Pa.s]:
-
the dynamic viscosity;
- g [m/s2]:
-
gravitational acceleration;
- \(D_{{}}^{i,eff}\) [m2/s]:
-
effective diffusion coefficient;
- C [mol/L]:
-
molar concentration;
- \(\vec{u}_{f}\) [m/s]:
-
flow rate of the liquid film;
- A f [m2]:
-
area of the liquid film;
- A O2 [m2]:
-
cross-sectional area of the bubble;
- A d [m2]:
-
cross-sectional area of the microchannel;
- \(\eta\) [-]:
-
porosity of the anode porous medium;
- S [kg]:
-
mass source phase;
- M [g/mol]:
-
molar mass;
- F [-]:
-
Faraday's constant;
- R [A/m2]:
-
exchange current density;
- \(K\) [-]:
-
permeability;
- A [m2]:
-
area of the proton exchange membrane;
- n d [-]:
-
electric traction coefficient;
- I [A]:
-
current;
- t m [m]:
-
thickness of the proton exchange membrane;
- \(\phi\) [V]:
-
overpotential;
- Rg [-]:
-
ideal gas constant,
- T [K]:
-
reaction temperature,
- \(\alpha\) [kmol/(m2.s.kPa)]:
-
transfer coefficient;
- \(\phi_{s}\) [V]:
-
potential of the microreactor chip skeleton structure;
- \(\phi_{m}\) [V]:
-
potential of the electrolyte;
- \(U_{{}}^{0}\) [V]:
-
equilibrium potential;
- \(\varsigma\) [m2]:
-
active surface area;
- \(j\) [A/m2]:
-
exchange current density;
- \(\gamma\) [-]:
-
concentration index;
- \(v\) [m/s]:
-
the flow rate;
- \(d\) [m]:
-
the equivalent diameter;
- \(\sigma\) [N/m]:
-
interfacial tension;
- An :
-
the anode microchannel;
- El :
-
transfer by electromigration;
- Sp :
-
transfer by diffusion;
- Cat :
-
cathode microchannel;
- L :
-
gas Phase;
- G :
-
liquid phase
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Qingjun, Y., Rizhi, D., Rui, Z. et al. Mass transfer of electrochemical CO2 reduction in microchannel. J Solid State Electrochem (2023). https://doi.org/10.1007/s10008-023-05643-2
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DOI: https://doi.org/10.1007/s10008-023-05643-2