Title: High Oxygen reduction reaction performances of Cathode materials combining Polyoxometalates, Coordination complexes and Carboneous supports

Guangjin Zhang

Chinese Academy of Sciences, China


Prof. Guangjin Zhang received his PhD (2004) Degree from Institute of Chiemistry, CAS. After research in University Paris-Sud XI, (2005-2009) under support of Marie-Curie Fellowship, he  joined Institute of process Engineering, CAS in 2009 as a full professor. His research interests mainly focus on the polyoxometalate-based new multifunctional materials as well as photo-electrical catalysis of these materials. He has published over 70 research papers in SCI journals. These paper have been cited for more than 2000 times.


A series of carbonaceous-supported precious metal-free polyoxometalate (POM)-based composites which can be easily synthesized on a large scale has been shown to act as efficient cathode materials for the oxygen reduction reaction (ORR) in neutral or basic media via a four-electron mechanism. In contrast to the commercial Pt/C (20 wt% Pt), these ORR heterogeneous electrocatalysts exhibit high durability and tolerance to methanol. Moreover, exploiting the versatility of the considered system, its activity has been optimized by the judicious choice of the 3d metals incorporated in the {(PW9)2M7} (M = Co, Ni) POM core, the POM counter-ions and the support (thermalized triazine-based frameworks (TTFs), fluorine-doped TTF (TTF-F), reduced graphene oxide or carbon Vulcan XC-72. In particular, for {(PW9)2Ni7}/{Cu(ethylenediamine)2}/TTF-F, the overpotentials required to drive the ORR compare well with those of Pt/C. This outstanding ORR electrocatalytic activity is in link 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, {(PW9)2Ni7}/{Cu(ethylenediamine)2}/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 those of Pt/C in neutral medium.

Audience Take Away:

•    Pt/free electrocatalyst
•    Oxygen reduction
•    Fuel cells