Stabilizing electrochemical carbon capture membrane with Al₂O₃ thin-film overcoating synthesized by chemical vapor deposition

Abstract

The stability of electrochemical silver-carbonate dual-phase membranes can be significantly enhanced by overcoating the surfaces of porous silver matrix with a uniform layer of Al2O3 thin-film derived from chemical vapor deposition.

A superior mixed electron and carbonate-ion conducting metal-carbonate composite membrane for advanced flue-gas carbon capture

“…The level of CO 2 flux density achieved by this membrane is also remarkable: 1.30, 1.02 and 0.73 mlmin -1 cm -2 for 700, 650 and 600 o C, respectively. Compared to previous studies using carbon black as a pore former [19][20][21], the CO 2 flux density achieved in this study is 3 higher. What is also intriguing from Fig.…”

“…With a similar electrochemical principle, our group as well as others recently proposed two new types of carbon capture membranes made of ceramic-carbonate and metalcarbonate dual-phase composites [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]…”

Dendritic silver self-assembly in molten-carbonate membranes for efficient carbon dioxide capture

“…It was also clear that in the majority of single pores, Ag dendrites did not cover the entirety of the pore walls. As portions of the highly wettable Al 2 O 3 surface remained exposed to MC, 28 this could…”

“…3 Dual-phase membranes can, in general, be categorised into two classes based on the nature of the solid support; ceramiccarbonate, [11][12][13][14][15][16][17][18][19][20][21][22][23] and metal-carbonate. [24][25][26][27][28][29][30][31][32][33] More recently, a combination of the two has been explored. [34][35][36] Ceramic-carbonate membranes are most commonly fabricated using ceramics with oxide-ion conductivity.…”

“…29 Attempts have been made to address stability issues by decreasing the average pore size of the Ag support to increase capillarity, 27,33 or by coating the surface of the Ag support with a nano-layer of Al 2 O 3 to improve MC wettability. 25,26,28 Alternatively, to limit Ag sintering, a refractory layer of ZrO 2 has been deposited. 31 It should also be noted that Ag is soluble in MC at the operating temperatures of dual-phase membranes, 39,40 through corrosion by MC in the presence of O 2 , 41 via reversible reaction (3):…”