Renewable and high efficient syngas production from carbon dioxide and water through solar energy assisted electrolysis in eutectic molten salts

Carbon deposition and sulfur poisoning during CO2 electrolysis in nickel-based solid oxide cell electrodes

“…Such variable energy production must be balanced with the more constant consumption profile by storing the energy for later use. One promising method of electrical energy storage is by electrolysis of water and/or CO2 to produce valuable chemicals like hydrogen, synthesis gas, and gaseous and liquid hydrocarbons [1,2]. Compared with conventional lowtemperature electrolysis, high-temperature electrolysis with solid oxide electrolysis cell (SOEC) devices offers some distinct advantages.…”

“…Small variations in thickness of the different components and absolute performance of the different cells is not believed to affect the observations reported here. Two 2CO  CO2 + C [1] CO2  O2 + C [2] CO  ½O2 + C [3] This study investigates the phenomenon of carbon deposition occurring before the expected threshold based on the outlet CO concentration and the thermodynamics of the Boudouard reaction. As an illustration of this issue, a cell was operated in CO/CO2 with a CO outlet gas concentration just below the Boudouard limit.…”

Syngas production: diverse H2/CO range by regulating carbonates electrolyte composition from CO2/H2O via co-electrolysis in eutectic molten salts

“…39,40 The actual decomposition voltage was greater than the theoretical value, E(decomposition potential) ¼ E(theory decomposition voltage) + E(overpotential) + IR. According to our previous study, 32,33 metal deposition occurs at higher voltages and, when the voltage exceeds 2.5 V, the CO content showed a signicant downward trend. Therefore, an electrolysis voltage range of 1.6-2.6 V was determined.…”

“…37,38 Furthermore, temperatures of over 600 C favor methane formation, achieving a methane yield of 64.9% in a eutectic mixture of carbonates as electrolyte in electrochemically reducing H 2 O/CO 2 . 28 In our previous study, 33 when the temperature was about 550 C, the methane content was less than 25%. Aer conducting a systematic experimental study of experimental data, the range of electrolysis temperatures studied herein was chosen as 500-600 C.…”

“…where n B is the stoichiometric number, B is a component of the reaction, H is the standard enthalpy (kJ mol À1 ), S is the standard entropy (J mol À1 K À1 ), G is the standard Gibbs free energy (kJ mol À1 ), Far is the Faraday constant (96 485C mol À1 ), n is the number of transferred electrons, t ¼ T/1000, and T is the temperature in K, and A-G are thermodynamic parameters. 33 For ease of discussion, the absolute value of the electrolysis potential was used to represent the calculation value. As shown in Fig.…”