Shulou(Shulou.com)11/24 Report--

Hydrogen has attracted much attention because of its potential as a clean energy. So far, most hydrogen is produced from fossil fuels such as natural gas, coal or oil. The hydrogen extracted from fossils must be purified from various common pollutants before it can be further applied to fuel cells.

The use of dense oxygen ion conduction ceramic membrane for fossil-derived hydrogen-assisted water decomposition is a new hydrogen purification technology. The oxygen ion conduction membrane composed of metal oxides has 100% selectivity for oxygen. if the high temperature water decomposition reaction is carried out on one side of the membrane and the fossil-derived hydrogen combustion reaction is carried out on the other side of the membrane, then the combustion of low purity hydrogen can drive the water decomposition on the other side of the membrane. hydrogen without carbon monoxide is directly obtained for hydrogen fuel cells. However, when exposed to complex atmospheres such as hydrogen, carbon dioxide, hydrogen sulfide, methane and water vapor, the chemical stability of existing oxygen ion conduction membranes is still a problem.

On the basis of the previous development of oxygen ion conduction membrane materials (Angew.Chem.Int.Ed. 2021, 60pr. 5204-5208. Recently, the research team of Qingdao Institute of Biological Energy and process Technology (QIBEBT) of the Chinese Academy of Sciences developed a new method of "recombination induced by interfacial reaction" to build an ultra-thin layer of oxygen ion transfer on the surface of ceramic oxide film to form a multi-layer ceramic membrane to stably and efficiently purify fossil derived hydrogen and produce hydrogen without carbon monoxide.

The study was published in the German Journal of Applied Chemistry (Angewandte Chemie International Edition) on November 3 and has applied for a Chinese invention patent and an international patent.

Screenshot of web page | Ref. [1] "Multilayer ceramic films are usually fabricated by layer-by-layer deposition. However, these traditional film-making processes (Fig. 1A) have numerous procedures and the resulting dense layer is thicker, usually between 10 μ m and 1000 μ m. In addition, the deposited dense layer is often peeled off from the support layer during co-sintering." Researcher Jiang Heqing, author of the newsletter, said.

Inspired by the structure of rhizome grass in the soil, the researchers developed an interfacial reaction-induced recombination method to make three-layer ceramic membranes (figure 1b). The oxygen conduction thin layer is rooted in the support layer, and the in-situ oxygen ion conduction membrane is very thin (~ 1 μ m). Dense and firmly adhere to the support layer, it can not only significantly reduce the oxygen ion transport resistance, but also avoid the film delamination or peeling, and maintain the integrity of the multi-layer structure ceramic membrane. In addition, this process requires only one-step heat treatment (one-step sintering of two-phase ceramic precursors), which is expected to reduce the preparation cost of multilayer ceramic membranes.

Fig. 1 has a schematic diagram of multilayer ceramic films with dense layers caused by ion transfer. A) traditional layer-by-layer deposition; b) recombination induced by interfacial reaction | Ref. [1] this method is suitable for more than ten different ceramic systems and has good universality, in which oxygen ion conduction films include Ce0.9Gd0.1O2- δ, Y0.08Zr0.92O2-δ, Ce0.9Pr0.1O2- δ, Ce0.9Sm0.1O2- δ, etc., referred to as CGO dense films. The researchers used the new ceramic membrane as a membrane reactor to produce hydrogen by oxidation-assisted water hydrolysis in a simulated coke oven atmosphere (containing H2, CH4, CO2, CO and H2S). It can run continuously and stably for more than 1000 hours, showing excellent stability and hydrogen production performance.

"these results show that this technology paves the way for the development of high-performance multilayer ceramics with functional layers, and has a broad application prospect, such as solid oxide fuel cells and electrolytic cells," said researcher Jiang Heqing. This will also be the focus of our future work. "

reference

[1] He, G., Lan, Q., Liu, M., Wu, G., Dunin-Borkowski, R. E. and Jiang, H. (2022), Multilayered Ceramic Membrane with Ion Conducting Thin Layer Induced by Interface Reaction for Stable Hydrogen Production. Angew. Chem. Int. Ed.. Accepted Author Manuscript. Https://doi.org/10.1002/anie.202210485

[2] https://www.eurekalert.org/news-releases/970563

[3] https://www.cas.cn/syky/202211/t20221107_4853939.shtml

Research team

Newsletter author Jiang Heqing: research fellow, Qingdao Institute of Biological Energy and process, Chinese Academy of Sciences

First author he Guanghu: associate Research fellow, Qingdao Institute of Biological Energy and process, Chinese Academy of Sciences

Paper information

Publish periodical Angewandte Chemie International Edition

Release date: November 3, 2022

Paper title Multilayered Ceramic Membrane with Ion Conducting Thin Layer Induced by Interface Reaction for Stable Hydrogen Production

(DOI: https://doi.org/10.1002/anie.202210485)

This article comes from the official account of Wechat: I am a scientist iScientist (ID:IamaScientist), compiled by Bamboo, edited by Jin Xiaoming, typesetting by Yin Ningliu

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.