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Hydrogen Generation in Microbial Reverse-Electrodialysis Electrolysis Cells Using a Heat-Regenerated Salt Solution

机译:利用热再生盐溶液在微生物逆电渗析电解槽中产生氢

摘要

Hydrogen gas can be electrochemically produced in microbial reverse-electrodialysis electrolysis cells (MRECs) using current derived from organic matter and salinity-gradient energy such as river water and seawater solutions. Here, it is shown that ammonium bicarbonate salts, which can be regenerated using low-temperature waste heat, can also produce sufficient voltage for hydrogen gas generation in an MREC. The maximum hydrogen production rate was 1.6 m3 H2/m3·d, with a hydrogen yield of 3.4 mol H2/mol acetate at a salinity ratio of infinite. Energy recovery was 10% based on total energy applied with an energy efficiency of 22% based on the consumed energy in the reactor. The cathode overpotential was dependent on the catholyte (sodium bicarbonate) concentration, but not the salinity ratio, indicating high catholyte conductivity was essential for maximizing hydrogen production rates. The direction of the HC and LC flows (co- or counter-current) did not affect performance in terms of hydrogen gas volume, production rates, or stack voltages. These results show that the MREC can be successfully operated using ammonium bicarbonate salts that can be regenerated using conventional distillation technologies and waste heat making the MREC a useful method for hydrogen gas production from wastes. © 2012 American Chemical Society.
机译:氢气可以在微生物逆电渗析电解槽(MREC)中使用有机物和盐度梯度能(例如河水和海水溶液)中产生的电流电化学产生。在此表明,可以使用低温废热再生的碳酸氢铵盐也可以产生足够的电压,以在MREC中产生氢气。最大产氢速率为1.6 m3 H2 / m3·d,盐度比为无限大时,氢产率为3.4 mol H2 / mol乙酸盐。基于所施加的总能量,能量回收率为10%,基于反应器中的消耗能量,能量效率为22%。阴极过电势取决于阴极电解液(碳酸氢钠)的浓度,但不取决于盐度比,这表明高阴极电解液的电导率对于最大化氢气的产生速率至关重要。 HC和LC流动的方向(并流或逆流)在氢气量,生产率或烟囱电压方面均不影响性能。这些结果表明,MREC可以使用碳酸氢铵盐成功运行,该碳酸氢铵盐可以使用常规蒸馏技术和废热进行再生,从而使MREC成为从废物中生产氢气的有用方法。 ©2012美国化学学会。

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