Electrochemical processes in the photoelectrolysis of nicotinamide adenine dinucleotide on the chlorophyll electrodes

✍ Scribed by Fujio Takahashi; Masuo Aizawa; Ryoichi Kikuchi; Shuichi Suzuki

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 528 KB
• Volume: 22
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(77)85075-5

✦ Synopsis

The photoelectrolysis, in which redox compounds are electrolysed on a pair of photo-excitable electrodes by supplying photo-energy in place of electric energy, has been performed. The photoexcitable electrodes were prepared by coating a platinum plate with a thin layer of a chlorophylC quinone composite. These electrodes were called chlorophyll electrodes. The chlorophyll eIectrode of chlorophyll-naphthoquinone composite worked as a cathode and that of chlorophyll-anthrahydroquinone composite as an anode when they were illuminated. The chlorophyll electrode of chlorophyllnaphthoquinone composite was characterized by an electrochemical behavior of,p-type semiconductor electrode. Reduction of nicotinamide adenine dinucleotide (NAD+) was carried out on the chlorophyll electrode under illumination at variaus controlled electrode potentials. NAD was reduced at extremely noble electrode potentials as compared with the reductive potential of NAD+ to NADH. Electron transfer accompanied with the photoelectrochemical reactions is discussed.