AI Article Synopsis
- A new type of carbon-supported polyoxometalate (POM)-based composites was developed as effective cathode materials for oxygen reduction reactions (ORR) that can be produced on a large scale.
- The performance of these materials was optimized by selecting specific 3d metals, POM counterions, and conducting supports like fluorine-doped triazine-based frameworks.
- The composite named {(PW)Ni}/{Cu(ethylenediamine)}/TTF-F was highlighted for its impressive electrocatalytic activity and stability, comparable to precious-metal catalysts like Pt/C, but without using any precious metals.
Article Abstract
A series of carbonaceous-supported precious-metal-free polyoxometalate (POM)-based composites which can be easily synthesized on a large scale was shown to act as efficient cathode materials for the oxygen reduction reaction (ORR) in neutral or basic media via a four-electron mechanism with high durability. Moreover, exploiting the versatility of the considered system, its activity was optimized by the judicious choice of the 3d metals incorporated in the {(PW)M} (M = Co, Ni) POM core, the POM counterions and the support (thermalized triazine-based frameworks (TTFs), fluorine-doped TTF (TTF-F), reduced graphene oxide, or carbon Vulcan XC-72. In particular, for {(PW)Ni}/{Cu(ethylenediamine)}/TTF-F, the overpotential required to drive the ORR compared well with those of Pt/C. This outstanding ORR electrocatalytic activity is linked with two synergistic effects due to the binary combination of the Cu and Ni centers and the strong interaction between the POM molecules and the porous and highly conducting TTF-F framework. To our knowledge, {(PW)Ni}/{Cu(ethylenediamine)}/TTF-F represents the first example of POM-based noble-metal-free ORR electrocatalyst possessing both comparable ORR electrocatalytic activity and much higher stability than that of Pt/C in neutral medium.
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| http://dx.doi.org/10.1021/acsami.7b10989 | DOI Listing |
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