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Advanced science: vertical transport of graphene oxide for efficient salt energy conversion

wallpapers News 2020-08-16
The sustainable development of

human society is facing the challenges of energy crisis environmental degradation. The development of renewable clean energy has become the common choice of all countries in the world. There is a large amount of renewable salt energy between seawater fresh water. When the same volume of river water is mixed with sea water the released energy is equivalent to the gravitational potential energy of the same amount of water at the height of 200 m so the junction of river sea is also called "salt difference waterfall". In the world the annual available energy of salt difference is about 26000 TWH which is equivalent to the global total annual power consumption. Reverse electrodialysis using membrane is a traditional method to collect energy of salt difference but it is restricted by the performance of selective osmosis membrane. In recent years the development of two-dimensional materials has effectively improved the properties of nano porous membranes but the power density of porous materials in seawater fresh water is still lower than the commercial stard of 5.0 wm-2.

the research team of Associate Professor Cao Liuzhu researcher Liu Feng of School of physics of Peking University have prepared two-dimensional graphene oxide (v-go) with the same direction of ion transport across the membrane to obtain membrane materials with high permeability. Compared with horizontally stacked graphene oxide (h-go) it is found that v-go keeps high cation selectivity its ion transport rate is three orders of magnitude higher than h-go under the same test conditions.

take advantage of the high permeability charge selectivity of v-go. By mixing seawater river water v-go can achieve an output power density of 10.6 wm-2 which is higher than that of porous membrane materials reported so far. V-go can maintain a stable power density increase the output power by increasing the area. At the same time the v-go has good stability maintains the output power density of more than 10 wm-2 during the test for more than 100 hours. Molecular dynamics simulation theoretical analysis of

reveal the reason for the rapid transport of ions in v-go. The vertical arrangement of lamellar structure provides lower entry barrier larger entrance area. This study reveals the decisive influence of the two-dimensional lamellar arrangement direction on the ion transport properties which will greatly promote the application of salt differential energy bring new enlightenment for high-performance nanostructure design chemical detection ion separation catalysis energy conversion.

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