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Metal-organic framework derived coralline-like non-precious metal catalyst for highly efficient oxygen reduction reaction

Chen, Linlin, Li, Yanyan, Xu, Ning, Zhang, Guoan
Carbon 2018 v.132 pp. 172-180
batteries, carbon, catalysts, cobalt, electrochemistry, energy conversion, fuel cells, ligands, mass transfer, methanol, pyrolysis, renewable energy sources, surface area, temperature
Non-precious metal catalysts with high activity and low cost play important role in oxygen reduction reaction (ORR) in the energy conversion devices, for example, fuel cells and metal-air batteries. In this work, we report a novel and feasible method to prepare coralline-like nitrogen-doped porous carbon catalysts with dispersed CoO and metallic Co through high temperature pyrolysis (900 °C) and alkaline etching (12 h), which is denoted as (Co@NPC-900)12. The metal-organic framework (MOF) MIL-101-NH2 (Al) acts as the host precursor, and then the second ligand is introduced to chelate Co2+ after one-step post-synthetic modification. The (Co@NPC-900)12 catalyst possesses high specific surface area (776.59 m2 g−1) and large pore volume (0.617 cm3 g−1), which is in favor of mass transport for ORR. The (Co@NPC-900)12 catalyst exhibits high ORR performance with a positive onset potential of 1.050 V vs. RHE and a half-wave potential of 0.824 V vs. RHE, which is comparable with the commercial 20% Pt/C. In addition, both the long-term stability and methanol tolerance of (Co@NPC-900)12 are superior to Pt/C. In general, the prepared (Co@NPC-900)12 catalyst shows the excellent ORR performance with four-electron pathway in alkaline solution, which can be applied in sustainable energy storage or conversion.