Proton conducting membranes for hydrogen and ammonia production

Abstract

Hydrogen and ammonia are ubiquitous chemical raw materials with a wide range of industrial applications. Methane steam reforming and Haber-Bosch process are the most commonly used industrial technology for hydrogen...

Electrochemistry and energy conversion features of protonic ceramic cells with mixed ionic-electronic electrolytes

“…Further decreases in p O 2 (or the degree of humidity) result in electron conductivity becoming a dominating factor in the overall transport of PCMs. These features should be considered when designing the protonic ceramic electrochemical devices, which operate in “dry” reducing atmospheres, including hydrogen production, alkane conversion 103–105 (ethane to ethylene, methane to benzene), ammonia synthesis, 106,107 etc. For example, the recent work of Wrubel et al 108 theoretically confirmed that cerium reduction of the BaCe 1− x − y Zr x Y y O 3− δ or BaCe 1− x − y − z Zr x Y y Yb z O 3− δ phases might significantly decrease the faradaic efficiency of the corresponding PCECs as compared with the BaZr 1− x Y x O 3− δ phases composed of cations (zirconium, yttrium ions) with stable oxidation states.…”

Proton Conducting Organic-Inorganic Composite Membranes for All-Vanadium Redox Flow Battery

“…Fascinatingly, in the last decade, with the explosion of the research into energy storage systems such as redox flow batteries (RFBs) and fuel cells, the selective transfer of protons is the primitive requirement from the membrane [ 7 , 8 , 9 , 10 ]. A plethora of research is devoted to the preparation of proton-selective membranes [ 11 , 12 , 13 , 14 , 15 ]. The basic concept involves the introduction of ionic groups such as sulfonic, phosphonic, carboxylic acid, etc., to the polymer backbone [ 16 , 17 , 18 ].…”

Tuning the two phases ratio by nonmetal ion doping in dual‐phase mixed‐conductive ceramic membranes

“…Particularly, mixed protonic-electronic conducting (MPEC) membranes show great attraction and huge competitiveness due to their unparalleled H 2 selectivity of 100%. [15][16][17][18] Therefore, the MPEC membranes exhibit great potential in H 2 separation and purification, as well as the relevant membrane reactors. [19][20][21] Up to now, perovskite-type oxides have been the most widely investigated MPEC materials with the chemical formula of ABO 3 , which possess high protonic conductivity.…”

“…Membrane separation technology is regarded as an efficient technique to purify H 2 for its high efficiency, simple operation, and energy conservation. Particularly, mixed protonic–electronic conducting (MPEC) membranes show great attraction and huge competitiveness due to their unparalleled H 2 selectivity of 100% 15–18 . Therefore, the MPEC membranes exhibit great potential in H 2 separation and purification, as well as the relevant membrane reactors 19–21 …”