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Japanese consortium synthesize bifunctional oxygen-reaction catalysts

By Chemical Engineering |

Researchers from the group of professor Ikuya Yamada at Osaka Prefecture University (Osaka, Japan; www.osakafu-u.ac.jp), in collaboration with the University of Tokyo, Japan Synchrotron Radiation Research Institute (Hyogo; www.spring8.or.jp) and Fuji Die Co. (Tokyo; www.fujidie.co.jp), have synthesized for the first time manganese-quadruple perovskites — CaMn7O12 and LaMn7O12 — which are compounds that both exhibit bifunctional electrocatalytic behavior for the oxygen evolution/reduction reaction (OER/ORR). The new catalyst systems are desirable for the development of energy conversion technologies, especially in the field of next-generation secondary batteries, such as metal-air secondary batteries. One explanation for the high OER activity of these new catalyst systems is the unique surface structure, which consists of corner-shared planar MnO4 and octahedral MnO6 units, which promote the direct formation of oxygen-oxygen bonds. Compared to existing manganese-oxide catalyst systems, the crystal structure of these new quadruple manganese perovskites could enhance the oxygen evolution catalytic activity by up to 30 times, say the researchers.
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