Proton-conducting ceramics

Using proton-conducting ceramics as an electrolyte for a steam electrolyzer involves the same reactions as for a low-temperature proton-conducting polymer membrane ... 

Chen, RL. et al., Preparation of Nd-doped BaCeOj proton-conducting ceramic and its electrical properties in different atmospheres, J. Eur. Ceram. Soc., 18, 1389-1395 (1998). 

Proton-conducting ceramic membranes have been studied as SOFC electrolytes for intermediate temperature, around 800°C, and can also be used as electrolytes in steam electrolysis. The families of SrCeOj and BaCeOj with dopants such as Y, Yb, and Nd on the Ce site show good selectivity for proton transport. The advantage of... 

Iwahara, H., Asakura, Y., Katahira, K., and Tanaka, M., Prospects of hydrogen technology using proton-conducting ceramics. Solid State Ionics, 168, 299, 2004. 

DIRECT ENERGY CONVERSION BY PROTON-CONDUCTING CERAMIC FUEL CELL SUPPLIED WITH CH4 AND ILO AT 60()-8()()°C... 

Relations between current density and terminal voltage (I-V curves) of the proton-conducting ceramic of Sr( c were determined for application to a fuel cell working at 600 - 800°C. In... 

Keywords proton-conducting ceramic, Sr-Ce-Yb oxide, fuel cell, high temperature, CH steam reforming, internal reform. 

Figure 8. Mass and charge transfer on proton-conducting ceramics fuel cell...

Figure 8 shows a schematic illustration of the anode reaction in the present proton-conducting ceramic fuel-cell system. In the anode, the following reactions may occur simultaneously ... 

Since the pioneering studies of Iwahara et al. [42, 43], most of the HT (>500 °C) proton-conducting ceramic materials that have been developed have been either cerates or zirconates, with the general formula (Sr,Ba)Cei where M is a... 

On recent years these proton-conducting ceramics have attracted increasing interest, not only as SOFC materials but also for HT electrolysis, for sensors, and for electrochemical processes. However, their widespread application depends on a number of factors, such as material stability, electrochemical and energetic efficiency and, of course, their cost. 

Figure 12.12 Hydrogen pumping using proton-conducting ceramics. 

Yajima, T., Koide, K., Takai, H., Fukatsu, N. and Iwahara, H. (1995) Application of hydrogen sensor using proton conductive ceramics as a solid electrolyte to aluminum casting industries. Solid State Ionics, 79, 333-57. 

At 700°C, the permeability of palladium is approximately 3.0 xlO- [mol/(m s Pa )] and the permeability of iron is 5.0x10- [mol/(m s Pa"0] [Buxbaum and Marker, 1993]. Figure 4 illustrates the hydrogen permeability of palladium, iron and the proton conducting ceramic material as a function of inverse temperature. The driving force for hydrogen flux in each membrane material is... 

FIGURE 2.14 Response/recovery time of the hydrogen sensor based on the (NH4)4Ta,oW03o solid electrolyte (Cj = 10 ppm Cj = 100,000 ppm). (From Zhuiykov, S., Hydrogen sensor based on a new type of proton conductive ceramic, Ira. J. Hydrogen Energy 21 (1996) 749-759. With permission.)... 

Zhuiykov, S., Hydrogen sensor based on a new type of proton conductive ceramic, Int. J. Hydrogen Energy 21 (1996) 749-759. 

Bridging the temperature gap with proton-conducting ceramics Direct ammonia fuel cells... 

Evaluate proton-conducting ceramic membranes for use in electrolyzers. 

Characterize the bulk hydrogen conductivity of the sintered proton-conducting ceramics using AC impedance spectroscopy and DC conductivity measurements. 

Obtain tubes of the proton-conducting ceramics and apply electrodes to these proton-conducting tubes. 

Tubes of the proton-conducting ceramic SrCeg, 95Ybo. 05O3-X were obtained from TYK Ceramics, and platinum electrodes were applied to the inner and outer sides of these tubes. 

A promising alternative to liquid and polymer membrane electrolytes is a proton conducting ceramic solid electrolyte technology. These materials offer a number of potential advantages over current systems ... 

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