Iridium Nanotubes as Bifunctional Electrocatalysts for Oxygen Evolution and Nitrate Reduction Reactions.

Author(s) Zhu, J.; Xue, Q.; Xue, Y.Y.; Ding, Y.; Li, F.M.; Jin, P.J.; Chen, P.; Chen, Y.
Journal ACS Appl Mater Interfaces
Date Published 2020 Mar 03

One-dimensionally (1D) hollow noble meal nanotubes are attracting continuous attention because of their huge potential applications in catalysis and electrocatalysis. Herein, we successfully synthesize hollow iridium nanotubes (Ir NTs) with the rough porous surface by the 1-hydroxyethylidene-1, 1-diphosphonic acid (HEDP) induced self-template method under hydrothermal conditions and investigate their electrocatalytic performance for oxygen evolution (OER) and nitrate reduction reactions (NO3-RR) in an acidic electrolyte. The unique 1D and porous structure endow Ir NTs with big surface area, high conductivity, and optimal atom utilization efficiency. Consequently, Ir NTs exhibit significantly enhanced activity and durability for acidic OER compared with commercial Ir nanocrystals (Ir c-NCs), which only require the overpotential of 245 mV to deliver the current density of 10 mA cm‒2. Meanwhile, Ir NTs also show higher electrocatalytic activity for NO3-RR than Ir c-NCs, such as faraday efficiency of 84.7% and yield rate of 921 μg h-1 mgcat-1 for ammonia generation, suggesting Ir NTs are universally advanced Ir-based electrocatalyst.

DOI 10.1021/acsami.0c01937
ISSN 1944-8252
Citation ACS Appl Mater Interfaces. 2020.

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