A new strategy to make an artificial enzyme: photosystem II around nanosized manganese oxide

作者：Najafpour Mohammad Mahdi^*; Madadkhani Sepideh; Akbarian Somayyeh; Holynska Malgorzata; Kompany Zareh Mohsen; Tomo Tatsuya; Singh Jitendra Pal; Chae Keun Hwa; Allakhverdiev Suleyman I

来源：Catalysis Science & Technology, 2017, 7(19): 4451-4461.

DOI：10.1039/c7cy01654a

Herein we report a new strategy to disperse Mn oxide into the apoenzyme of photosystem II. The compound was characterized by scanning electron microscopy, transmission electron microscopy, UV-visible spectroscopy, Fourier transform infrared spectroscopy, X-ray absorption near edge structure, extended X-ray absorption fine structure, X-ray diffraction and some electrochemical methods. Under electrochemical conditions, the peaks attributed to Mn(II)/(III), Mn(III)/(IV) and Mn(II)/(IV) were assigned and compared with other manganese oxides. Linear sweep voltammetry shows that water electro-oxidation occurs at 80 mV less than that for the apoenzyme of photosystem II. Thus, Mn oxide maintains its water-oxidizing activity under these conditions. The compound is a new type of structural and functional model for the wateroxidizing complex in photosystem II.

• 出版日期2017-10-7