PHOTOELECTROCHEMICAL REDUCTION OF AQUEOUS CARBON-DIOXIDE ON P-TYPE GALLIUM-PHOSPHIDE IN LIQUID JUNCTION SOLAR-CELLS
PHOTOELECTROCHEMICAL REDUCTION OF AQUEOUS CARBON-DIOXIDE ON P-TYPE GALLIUM-PHOSPHIDE IN LIQUID JUNCTION SOLAR-CELLS
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DOI：
10.1038/275115a0
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发表时间：
1978-01-01
期刊：
影响因子：
64.8
通讯作者：
HALMANN, M
中科院分区：
文献类型：
--
作者：
HALMANN, M
作为自然光合作用的替代方案，二氧化碳非生物还原为有机化合物对于生产有机原材料或燃料很有意义。在一种方法中，在亚铁盐存在的情况下，通过紫外线照射提供所需的能量，并导致甲酸和甲醛的产生。在另一种方法中，通过二氧化碳水溶液的电化学还原从外部电源提供能量。还报道了水溶液中碳酸氢钠电解过程中二氧化碳的还原和甲酸的产生，并且汞阴极上二氧化碳还原的研究回顾了早期的工作3。汞电极上的极谱测量表明，二氧化碳而不是碳酸氢根离子是电活性物质，半波还原电位为-2.1 V（相对于 SCE），并且甲酸是唯一的产物4。我们在此报告了使用p型磷化镓作为光电阴极实现二氧化碳水溶液的光辅助电解还原，部分或全部能量由光提供。产物是甲酸、甲醛和甲醇。
THE non-biological reduction of carbon dioxide to organic compounds is of interest, as an alternative to natural photosynthesis, for the production of organic raw materials or fuel. In one approach, the required energy was supplied by irradiation with UV light, in the presence of ferrous salts, and resulted in the production of formic acid and of formaldehyde1. In another approach, the energy was supplied from an external power source by electrochemical reduction of aqueous carbon dioxide. The reduction of carbon dioxide and production of formic acid during the electrolysis of sodium bicarbonate in aqueous solutions has also been reported2, and a study of the reduction of carbon dioxide on a mercury cathode reviews earlier work3. Polarographic measurements on mercury electrodes showed that carbon dioxide, rather than the bicarbonate ion, is the electroactive species, with a half-wave reduction potential of −2.1 V (relative to SCE), and that formic acid is the only product4. We report here the photoassisted electrolytic reduction of aqueous carbon dioxide, achieved using p-type gallium phosphide as a photocathode, with part or all of the energy being supplied by light. The products were formic acid, formaldehyde and methanol.