Polydopamine-Coated Manganese Complex/Graphene Nanocomposite for Enhanced Electrocatalytic Activity Towards Oxygen Reduction.
作者： Charlette M. Parnell , Bijay Chhetri , Andrew Brandt , Fumiya Watanabe , Zeid A. Nima
DOI: 10.1038/SREP31415
关键词:
摘要: Platinum electrodes are commonly used electrocatalysts for oxygen reduction reactions (ORR) in fuel cells. However, this material is not economical due to its high cost and scarcity. We prepared an Mn(III) catalyst supported on graphene further coated with polydopamine, resulting superior ORR activity compared the uncoated PDA structures. During ORR, a peak potential at 0.433 V was recorded, which significant shift material’s −0.303 V (both versus SHE). All materials reduced wide pH range via four-electron pathway. Rotating disk electrode rotating ring studies of polydopamine-coated revealed occurring 4.14 4.00 electrons, respectively. A rate constant 6.33 × 106 mol−1s−1 observed material–over 4.5 times greater than nanocomposite those reported similar carbon-supported metal catalysts. Simply integrating inexpensive bioinspired polymer coating onto Mn-graphene increased performance significantly, over +730 mV. This indicates that can reduce higher but lower energy usage, revealing excellent as electrocatalyst
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