As long as the cell structure is modified, the energy cell microorganisms will be able to increase their "enthusiasm for generating electricity", increase their efficiency, consume more waste and turn it into waste? Recently, the new issue of "Nature · Communication" magazine published the latest research results of the team of Professor Song Hao from the School of Chemical Engineering of Tianjin University online. This research has solved important scientific problems in the field of microbial electrochemistry, and provided a feasible idea for improving the efficiency of extracellular electron transfer in power microbial cells and promoting the industrial application of power cell microbes "turning waste into treasure".

According to reports, the process of microbial electrocatalysis is a process in which electrical energy cells perform two-way electron and energy exchange with the external environment by means of cell charge and discharge. It has a broad application prospect in the fields of energy, environment, chemical industry, and military. This process can realize the application of "turning waste into treasure" in the field of environmental energy, such as microbial fuel cells that promote the degradation of organic waste and electrical energy recovery, microbial electrolysis cells used to treat animal husbandry, brewing, and food processing industrial wastewater, Microbial electrosynthesis for reducing carbon dioxide and synthesizing high value-added fine chemicals.

Microbial electrocatalysis systems (microbial electricity generation, microbial electrosynthesis, microbial non-equilibrium electrical fermentation, etc.) dominated by electrical energy cells are emerging as a new green and new energy production method. At present, the cell electron transfer efficiency is too low, which has become the biggest bottleneck restricting the industrial application of electrical energy cells and microorganisms. How to use electrical energy cells to generate electricity efficiently has become a difficult problem that scientists can't wait to solve. The team of Song Hao used synthetic biology modular engineering to transform cell strategy, systematically optimized and reconstructed Shewanella, and transformed its genetic genes. "We found that the size of the 'electron pool' inside the electrical energy cell is the key factor limiting the extracellular electron transfer rate." Song Hao compares the cell's electron carrier NAD + to the cell's internal "battery", and its capacity directly affects the cell's electricity production effectiveness. The experiment also proves that by increasing the total amount of intracellular electron carrier NAD + and strengthening the substrate consumption rate, the cell electron transfer rate can be significantly improved, which in turn can stimulate the energy cell microbes to "put into work" more efficiently. (Reporter Sun Yusong correspondent Zhao Xijun)

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