过电位
电催化剂
材料科学
铱
析氧
催化作用
双功能
电解质
化学工程
分解水
无机化学
电化学
化学
光催化
电极
有机化学
物理化学
工程类
作者
Jingyi Zhu,Qi Xue,Yuanyuan Xue,Yu Ding,Fu-Min Li,Pujun Jin,Pei Chen,Yu Chen
标识
DOI:10.1021/acsami.0c01937
摘要
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-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 areas, high conductivity, and optimal atom utilization efficiency. Consequently, Ir NTs exhibit significantly enhanced activity and durability for acidic OERs 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 that of Ir c-NCs, such as a Faraday efficiency of 84.7% and yield rate of 921 μg h-1 mgcat-1 for ammonia generation, suggesting that Ir NTs are universally advanced Ir-based electrocatalysts.
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