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Advanced materials: multiple biomimetic electrodes for in situ separation of electrolyzed water products

hydrogen energy is known as one of the most potential renewable clean energy in the 21st century with high energy storage density low environmental load. Hydrogen production from electrolytic water is not only a green way to obtain hydrogen energy but also an ideal way to store excess electricity. In electrolyzed water system hydrogen oxygen are generated synchronously easily mixed with each other. Therefore how to separate hydrogen oxygen has become a key problem in actual production. The traditional solution is to use ion exchange membrane to separate the anode cathode but the cost of ion exchange membrane is high needs to be replaced frequently. In recent years a number of designs of diaphragm less electrolyzers have emerged which abon ion exchange membrane use microfluidic technology to separate hydrogen oxygen. Although the diaphragm free design simplifies the structure of the cell the application of microfluidic system requires precision instruments additional energy input. Therefore it is particularly important to develop electrolysis system with the ability of spontaneous fluid transport.

are naturally the sources for human beings to seek solutions to industrial production problems. After hundreds of millions of years of evolution the fluid transport methods adopted by organisms often have obvious characteristics of high efficiency low consumption fast so on. Inspired by diving bell water spider (underwater bubble capture) lotus leaf (asymmetric wettable interface) cactus (geometrically asymmetric interface) Ma Jun academician team of Harbin Institute of technology together with Jiang Lei academician team of Institute of physics chemistry of Chinese Academy of Sciences Dr. Cao Moyuan team of Tianjin University realized in-situ separation collection of electrolyzed aquatic product H2 / O2 by bionic interface bubble manipulation for the first time. The bionic interface has a double gradient structure (wettability gradient shape gradient) which can not only drive the surface directional movement anti buoyancy penetration of underwater bubbles but also control the directional enrichment of micro bubbles in situ. Based on the biomimetic electrodes the researchers constructed a step array of electrodes a compact integrated water electrolysis device which realized synchronous electrolysis gas production bubble directional transportation collection.

in this study a new method based on the electrode interface structure to realize the separation of electrolyzed water gas is proposed which provides a new idea for the design of compact electrolytic cell without diaphragm simplified structure.

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