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Atomically Isolated Iron Atom Anchored on Carbon Nanotubes for Oxygen Reduction Reaction
journal contribution
posted on 2019-10-20, 19:13 authored by Dong Liu, Jin-Cheng Li, Qiurong Shi, Shuo Feng, Zhaoyuan Lyu, Shichao Ding, Leiduan Hao, Qiang Zhang, Chenhui Wang, Mingjie Xu, Tao Li, Erik Sarnello, Dan Du, Yuehe LinRecently,
electrocatalysts based on anchored dispersive/isolated
single metal atoms on conductive carbon supports have demonstrated
great promise to substitute costly Pt for the oxygen reduction reaction
(ORR) in the field of fuel cells or metal-air batteries. However,
developments of cost-efficient single-atom Fe catalysts with high
activities are still facing various hardships. Here, we developed
a facile way to synthesize isolated iron atoms anchored on the carbon
nanotube (CNT) involving a one-pot pyrrole polymerization on a self-degraded
organic template and a subsequent pyrolysis. The as-obtained electrocatalyst
possessed unique characteristics of abundant nanopores in the wall
of conductive CNTs to host the abundant atomic Fe-Nx active sites, showing ultrahigh ORR activity (half-wave
potential: 0.93 V, kinetic current density: 59.8 mA/cm2 at 0.8 V), better than that of commercial Pt/C (half-wave potential:
0.91 V; kinetic current density: 38.0 mA/cm2 at 0.8 V)
in an alkaline electrolyte. Furthermore, good ORR activity has been
proven in acidic solution with a half-wave-potential of 0.73 V.
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fuel cellsdensity0.73 Vmetal atomscarbon nanotubeconductive CNTsPt0.91 V0.8 Viron atomsoxygen reduction reactionultrahigh ORR activityCarbon NanotubesmAas-obtained electrocatalystsingle-atom Fe catalystsone-pot pyrrole polymerizationOxygen Reduction ReactionIron Atom AnchoredORR activityconductive carbon0.93 Vhalf-waveFe-N xacidic solutionmetal-air batteries
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