Proton conductivity in a new class of H2S modified thioborate-based glasses and ceramics

Karthikeyan, A.; Martindale, Chad A.; Martin, Steve W.

doi:10.1016/j.ssi.2004.08.032

Cited by 7 publications

(7 citation statements)

References 8 publications

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“…The requirement that the barrier layer must allow migration of H limits the type of materials that can be used -the disclosure makes mention of perovskites, oxy-acids and fluorides, while other patents make mention of metal oxides [222,223], carbides [224] and chalcogenides [225]. Metal chalcogenides, particularly in the form of glasses, are well known to be proton conducting [226][227][228], but are limited in their application due to their low melting points. In a similar vein, several other patents [214,229,230] and publications [214] disclose the use of high-bond valence (BV) metals (e.g., Ta, Nb) as an intermediate layer for supported Pd membranes, designed to prevent diffusion between the Pd separation layer and the porous support structure.…”

Section: Catalytic Coatings and Barrier Layersmentioning

confidence: 99%

Non-Pd BCC alloy membranes for industrial hydrogen separation

Dolan

2010

Journal of Membrane Science

252

152

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Section: Catalytic Coatings and Barrier Layersmentioning

confidence: 99%

Non-Pd BCC alloy membranes for industrial hydrogen separation

Dolan

2010

Journal of Membrane Science

252

152

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“…Chalcogenide glasses offer a new method for proton conduction at 100-300°C, while maintaining good mechanical stability in a reducing atmosphere [93] with PbO-SiO 2 , BaO-SiO 2 and CaO-SiO 2 cited for practical potential [94]. The ionic conductivity data for various materials are given in Table 2.…”

Section: Pyrochloresmentioning

confidence: 99%

Review of proton conductors for hydrogen separation

Phair

Badwal

2006

Ionics

223

132

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There is a global push to develop a range of hydrogen technologies for timely adoption of the hydrogen economy. This is critical in view of the depleting oil reserves and looming transport fuel shortage, global warming, and increasing pollution. Molecular hydrogen (H 2 ) can be generated by a number of renewable and fossil-fuel-based resources. However, given the high cost of H 2 generation by renewable energy at this stage, fossil or carbon fuels are likely to meet the short-to medium-term demand for hydrogen. In view of this, effective technologies are required for the separation of H 2 from a gas feed (by-products of coal or bio-mass gasification plants, or gases from fossil fuel partial oxidation or reforming) consisting mainly of H 2 and CO 2 with small quantities of other gases such as CH 4 , CO, H 2 O, and traces of sulphur compounds. Several technologies are under development for hydrogen separation. One such technology is based on ion transport membranes, which conduct protons or both protons and electrons. Although these materials have been considered for other applications, such as gas sensors, fuel cells and water electrolysis, the interest in their use as gas separation membranes has developed only recently. In this paper, various classes of proton-conducting materials have been reviewed with specific emphasis on their potential use as H 2 separation membranes in the industrial processes of coal gasification, natural gas reforming, methanol reforming and the watergas shift (WGS) reaction. Key material requirements for their use in these applications have been discussed.

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“…6, is the highest reported by our group [11,21]. This value represents a slight improvement over the conductivity of the ternary H 2 S-B 2 S 3 -GeS 2 and binary CsI-HBS 2 systems [11,22] and is approximately one to two orders of magnitude greater than the base meta-thioboric acid. However, this behavior is lower than the expected improvement shown in other fast ion conducting glasses, where alkali iodide salts are added to sulfide glasses and produce a two to four order of magnitude increase in the ionic conductivity.…”

Section: Discussionmentioning

confidence: 55%