Transition Metal Chalcogenides for the ORR

Behret et al. [105, 106] also investigated the eatalytic ORR activity and mechanism catalyzed by thiospinel-type sulfides with a focus on metals such as Co, Ni, and Fe. The thiospinel sulfides have a Me Me 2S4 formulation, where Me - represents an ion on the tetrahedral sites and Me an ion on the octahedral sites. They prepared these thiospinel sulfides by two different methods, one at high temperature and the other at low temperature. For the high-temperature method, the sulfur and metal components were ball-milled in a degassed atmosphere and 

The ORR mechanism catalyzed by cobalt sulfide was also elucidated by a theoretical approach based on quantum chemistry as well as experimental validation. Reyimjan et al. [108] carried out a theoretical analysis of the catalytic 

According to previous studies by Behret and Campbell [105, 107], the doping of tungsten into cobalt sulfide had a negative effect on the ORR activity. However, Lee et al. [110] recently proved that tungsten could promote the eatalytic activity of Co-Se. They synthesized unsupported W-Co-Se powder by ehemical reaction in 

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