Highly selective reduction of CO2 through a protonic ceramic electrochemical cell

作者：Wang, Yakun; Zhang, Hua; Cao, Jiachun; Xu, Kang; Pei, Kai; Chen, Yu^*

来源：Journal of Power Sources, 2022, 524: 231101.

DOI：10.1016/j.jpowsour.2022.231101

• Protonic ceramic electrochemical cells
• Carbon dioxide utilization
• CO production
• Durability

CO2 reduction has attracted widespread attention due to its critical role in the realization of carbon neutrality. Efficient conversion of CO2 to CO or CH4 via a protonic ceramic electrochemical cell (PCEC) is a good strategy. Herein, a promising electrochemical performance of CO2 reduction is achieved from a PCEC with a NdBa0.8Ca0.2Co2O5+sigma (NBCC) air electrode, a BaZr0.4Ce0.4Y0.1Yb0.1O3-sigma (BZCYYb) electrolyte, and a Ni-BZCYYb fuel electrode. A current density of 1.259 A cm(-2) at 1.3 V is delivered when the fuel- and air-electrodes are exposed to 20% CO2-80% H-2 and wet air with 3% H2O. A distribution of relaxation times analysis indicates that the rate-limiting step changes from the medium frequency region to the low-frequency region with the increase of the electrolysis current density. At 650 degrees C, the cells can typically produce CO at a production rate of similar to 595 mu mol min(-1) cm(-2) at 0.75 A cm(-2) with high selectivity of over 99%, and a reasonable short-term stability has been demonstrated in a testing period of 100 h at 1 A cm(-2).

• 单位
  广东工业大学; y