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Continuous, stable, light and heat / high speed interface Joule heat assisted evaporation desalination

Industry trends

Carbon material has a very broad application prospects in energy capture, storage and utilization. In recent years, the use of high efficiency solar evaporation interface has become a new hotspot, a number of new materials in the carbon material is particularly excellent. Evaporation using interface may provide new solutions for the efficient use of clean energy, desalination, waste water treatment and the like. Subject to a lower energy density of sunlight (1 kW m 2 ), the new material can be achieved Most solar thermal evaporation rate of the interface is still at a low level, only the natural evaporation rate (0.5 kg m is about 3 times 2 h 1) of the. Moreover, the use of solar thermal interface to achieve the evaporation rate is not stable enough, affected by weather, sunlight and other factors irradiation diurnal variation, poor use under cloudy day, night, indoor and other environmental effects. Adopt measures to enhance the physical device convergence solar energy, high cost, which is currently a lot of solar energy equipment is difficult to promote the use of one of the main reasons a large area. Power supply clean energy (e.g., solar, wind, etc.) have been based on large-scale applications, especially in off-line power yearly costs for new energy supply interface provides new opportunities evaporated. Recently, Shanghai Jiaotong University Associate Professor Zhao Bin Yuan (Associate Professor Binyuan Zhao) Task Force and the City University of London (City, University of London) George Dennis Assistant Professor, International Chemical Industry Association (Society of Chemical Industry, SCI) Chairman of the British branch of Dr. WU Weiping (Dr Weiping Wu) Research Group, Department of materials at Oxford University Professor Robert Bradley [123 ] cooperation , the mesoporous carbon – copolymer complex structure to achieve the wind, solar thermal evaporation interface, Advanced Functional Materials, 28, 1870332, 2018, https://onlinelibrary.wiley.com/doi/ 10.1002 / adfm.201870332,https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.201803266, environment-friendly multi-level and large pore carbon material photothermal evaporation, based RSC Advances, 9, 29414, 2019 and other previous work, [ 123] achieved sustained, stable, high rate of evaporation interface aspects important progress . They based nano-optical surfaces and super metamaterial principle, a combination of new ideas +-dimensional two-dimensional (1D + 2D) material design, invented a new flexible graphene / carbon fiber sheet to all carbon-based composite material rGO-CC, and design of composite – hydrophilic fiber cloth – foam insulating layer structure for electric and photothermal evaporation. Wherein skillfully with CFRP composite material in which the carbon is deposited electrochemically deposited on the surface oxidized graphite fiber, and graphite oxide in situ by the Joule heat of the electric heat-reduction, the preparation of graphene /. The work as a positive cover (Figure 1), published in Wiley\’s journals Advanced Sustainable Systems on (Graphene-Carbon Composites for Solar and Low-Voltage Powered Efficient Interfacial Evaporation. Advanced Sustainable Systems, 4, 1900122, 2020), PhD Liu Fenghua (Fenghua Liu) is the first author of the paper, Associate Professor Zhao Bin yuan and Dr. WU Weiping for the corresponding author.

FIG Cover 1 持续、稳定、高速率的光热/焦耳热界面蒸发助力海水淡化
The structure of all carbon-based materials, low cost, flexible folded bent, environment-friendly, while using solar heat and driving the piezoelectric low (only Joule heat is 1 volt to 3-volt power supply) is generated, to achieve high speed, high efficiency, stable, green evaporated interface (FIG. 2). The program not only applicable to desalination of clean energy, but also widely applicable to various types of evaporation, distillation, sewage treatment, sterilization, and other fields.
FIG graphene 2 – Electrochemical carbon fiber sheet composite material – Preparation Joule heat evaporation apparatus and a schematic interface 持续、稳定、高速率的光热/焦耳热界面蒸发助力海水淡化
carbon fiber sheet excellent flexibility, high electrical conductivity, and ultraviolet, thermal stability , the optical absorption in the visible and near-infrared region is high, and the graphene composite optical absorption capacity has been further improved to around 97%. In a standard solar irradiance of (AM1.5G, 1 kW m 2), photothermal evaporation rate rGO-CC composite device reaches 2.54 kg m 2 h 1, up to five times the rate of natural evaporation of the water, significantly better than the other New Materials. This is mainly due to the entire composite structure is thin, is excellent in controlling effect localized heat, and the all-carbon composite material having a relatively large pore structure and a suitable surface properties conducive to mass transfer and rapid escape of steam (FIG. 3 shown).
FIG. 3 graphene – carbon fiber sheet all carbon composite scanning electron microscope (SEM) photograph, infrared thermal imaging pictures, light-absorbing properties and photothermal interface evaporation curve 持续、稳定、高速率的光热/焦耳热界面蒸发助力海水淡化
In addition, they further use of Joule heat driven at low voltage, effectively solves the problem of light instability and low rate of thermal evaporation. Graphene and carbon fiber sheet all-carbon composite material having a highly graphitized structure, excellent conductive properties, using the Joule heating of the material is required to achieve significant at lower voltages. Experiments show that, when a low voltage is applied, the surface temperature of Joule heat is very easy to break boiling point of water (100 degrees Celsius), the maximum heating temperature can reach 385 degrees Celsius, and short start-up time, the heating temperature is adjusted (FIG. 4). I.e., as the voltage of the input power is increased, the interface may be implemented evaporated improved significantly. Hydrophobic carbon cloth 3 volts at a low voltage, the evaporation rate of up to 45.87 kg m 2 h 1 (FIG. 5).
FIG 4 graphene – Joule heat properties of carbon fiber sheet composite structure 持续、稳定、高速率的光热/焦耳热界面蒸发助力海水淡化
FIG. 5 graphene – Joule heat interface carbon fiber sheet of the composite structure evaporation 持续、稳定、高速率的光热/焦耳热界面蒸发助力海水淡化
the research work has made solar thermal desalination, a breakthrough in the field of interface evaporation. Utilization Strategy electric Joule heat and solar thermal combination is expected to be stable and sustainable, high-speed interface evaporation of the most effective solutions inDesalination, sewage treatment, water purification and utilization of new energy and so has broad prospects, provides a great potential solutions for sustainable development, environmental protection, climate change and alleviate the shortage of fresh water resources and other issues. Paper won the reviewers highly praised, \”Authors of this manuscript mainly report the synthesis of graphene-carbon composites and also their applications in the field of the water evaporation. This work would potentially contribute to the development of the water evaporation, especially, the utilization of low voltages to increase the evaporation rate \”, and

Advanced Sustainable Systems preferably 2020 volume 4 No. 3 positive cover of the journal (https: // onlinelibrary. wiley.com/toc/23667486/2020/4/3). The project won the British Innovation Agency (Innovate UK, Grant 104013), the UK Research and Innovation Agency (UK Research and Innovation, UKRI), Global Research Challenge Fund (Global Challenges Research Fund, referred to GCRF) and the Shanghai Science and Technology Commission (STCSM, Grant 17230732700) funding. Original link: https: //onlinelibrary.wiley.com/doi/full/10.1002/adsu.201900122

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