The PhD, Zhang He, a Ph.D., a Ph.D., a Ph.D., is sitting in the experimental station, and continuously adjusts the connection mode of the device by observing the operation of electrochemical workstation data. This is his daily epitome of his daily life.
“Sometimes the cycle test may take more than a dozen hours, the operator must be in front of the laboratory device.” He told the “China Science News”. * Close, Zhang He finally relaxed shortly. Under the guidance of the Chinese Academy of Sciences Dong Shajun, his team successfully implemented continuous conversion and storage of solar energy in the integrated system by constructing a biochemical model based on water / oxygen circulation. Relevant results have been published in “American Chemical Society”.
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Uninterrupted solar earth rotation, causing alternating changes in white and night in nature, which leads to intermittent, non-continuous. For conventional photovoltaic devices, to achieve a continuous power output, continuous illumination is the basic condition of the device to function properly. However, affected by regional illumination, energy conversion (light energy to electrical energy) in photovoltaic devices is a non-conneity process. This limits the direct utilization of solar energy to make it unable to meet the power needs of the actual production life. To solve this problem, scientists have proposed corresponding energy reserve strategies to achieve solar transformation and storage by connecting the photoelectrochemical system with secondary batteries or liquid flow battery systems. “But, multi-system continues to have a complex system, high cost, and severe energy transmission loss. “The first author of the paper, the first author of the paper, the multi-system connection is used to consider the matching problem between the system and the system. On the other hand, the energy is easily unavoidable in thermal energy in the transmission transfer process. In this way, there is an effective use of equipment costs and is not conducive to storage energy. In 2018, the team successfully constructed a water / oxygen-based biochemical pool by using the N-type semiconductor light anode and the multiprametic oxidase biological cathode. Continuously stable conversion to chemical energy to electrical energy. However, as the traditional photoelectrochemical system, the operation of the system is completely controlled by the external light, and it is urgent to further correct. “Our team has established a integrated biochemical model system by introducing energy storage module (polypyrole capacitor electrodes) based on the research work. In the state of the water / oxygen in the system, the power output of the source and the steady source of light and the dark field is realized. “Zhang He said.
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Store solar energy for the battery system, the team starts from the electrochemical behavior of a single electrode, and then from a single electrode to a single battery to the entire system, the components and overall properties of the construction model system. Examine. The first thing that is first encountered is the choice of energy storage module. One of the authors of the paper, the Chinese Academy of Sciences Changchun Institute of Applied Chemistry, China, Huang Liang, told the “Chinese Science News” to ensure the normal energy storage of solid capacitor electrodes, one side of its charge / discharge potential window needs to die from the optical fuel cell. Between potentials; on the other hand, it is necessary to ensure a high and stable capacitance in the neutral electrochemical system. “After many aspects of optimization selection and testing, we choose a polypyrrole capacitor electrode as an energy storage module. “As far as, the dual role of polypylastical capacitor electrode is actuated to achieve the integrated connection of the photoelectrochemical system and the battery system. Under the photochemical system, the polypyrrole capacitor electrode is received as a cathode to accept light electrons produced from the anode, and the performance of its own capacitance is stored, and the light energy to electrical energy, chemical conversion; under the dark field conditions, The polypyrrole capacitor electrode in the battery system is also transmitted as an anode to the bio-cathode to achieve the conversion of chemical energy to electrical energy. The second difficulty is the matching problem of the potential between the various electrodes during the storage process. “Need to determine the charge / discharge potential of capacitor electrodes. “One of the authors of the papers, Zi Junfeng, a Home Research Institute, Chinese Academy of Sciences, Tao Junfeng, told the” China Sciences News “, in the photoelectrochemical system, the anode photocatalytic water oxidation (Oer) potential is less than-0.1 v to effectively achieve photosensitive charge In the storage of the capacitor electrode, the titanium dioxide electrode can be used as a suitable photocatalytic material in this system. In the biofuel cell system, the cathode catalytic oxygen reduction potential needs to be higher than 0.3 V to effectively realize the release of photosynthetic charge from the capacitor electrode. Therefore, the team selects biliary oxidase as a suitable biocatalytic material, which is used in this system. Experimental data analysis showed that the concept model obtained 0.34 ¡À 0.01 and 0.19 ¡À 0.02 MW CM-2 * high-power density output under light and housing, and showed a stable solar storage cycle performance. In addition, by changing the capacitance of the energy storage module (polypyrole capacitor electrode), the system charge / discharge time can be effectively regulated.Recommend:
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