期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 12, 页码 14064-14070出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c01937
关键词
iridium; one-dimensional nanomaterials; hollow structure; oxygen evolution reaction; nitrate reduction reaction
资金
- National Natural Science Foundation of China [21875133, 51873100]
- Fundamental Research Funds for the Central Universities [GK201901002, GK201902014, 2019TS007]
- 111 Project [B14041]
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 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 Jr nanocrystals (Ir c-NCs), which only require the overpotential of 245 mV to deliver the current density of 10 mA cm(-2). Meanwhile, Jr 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 mu g h(-1) mg(cat)(-1) for ammonia generation, suggesting that Ir NTs are universally advanced Ir-based electrocatalysts.
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