塔菲尔方程
纳米线
铱
分解水
析氧
材料科学
电化学
化学工程
纳米技术
电解质
催化作用
电极
化学
物理化学
光催化
有机化学
工程类
作者
Leigang Li,Pengtang Wang,Zifang Cheng,Qi Shao,Xiaoqing Huang
出处
期刊:Nano Research
[Springer Nature]
日期:2021-09-09
卷期号:15 (2): 1087-1093
被引量:23
标识
DOI:10.1007/s12274-021-3603-9
摘要
The sluggish reaction kinetics of oxygen evolution reaction (OER) has largely lowered the efficiency of electrochemical water splitting. Ir represents one of the state-of-the-art electrocatalysts for promoting OER especially in acidic electrolytes. However, it remains a formidable challenge to synthesize high-quality one-dimensional (1D) Ir-based nanostructures for improved electrocatalytic performance. Herein, a template-assisted synthesis method is reported wherein 1D porous Ir-Te nanowires (Ir-Te NWs) are synthesized with Te NWs serving as the template. The Ir-Te NWs exhibit highly enhanced OER performance compared to commercial IrO2 and Ir/C. In detail, the overpotentials to reach 10 mA·cm−2 are 248 and 284 mV in 1 M KOH and 0.5 M H2SO4, respectively, much lower than those of commercial catalysts. The Ir-Te NWs also show smaller Tafel slopes than commercial IrO2 and Ir/C, signifying faster reaction kinetics. Besides, much more durable OER activity can be maintained for Ir-Te NWs with negligible decay during 25 and 20 h stability tests in 1 M KOH and 0.5 M H2SO4, respectively. Further analysis indicates that the significantly improved OER performance of Ir-Te NWs could be ascribed to the larger electrochemical surface area and smaller electrical resistance. More significantly, the templated synthesis of Ir-Te NWs can be facilely extended to the fabrication of other metal-Te NWs including Ru-Te, Rh-Te and Pt-Te NWs. The design and synthesis of 1D metal-based NWs in this work provide important inspiration for the synthesis of diversified 1D metallic nanostructures with distinctly enhanced catalytic performance and beyond.
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