One-dimensional iridium-based nanowires for efficient water electrooxidation and beyond  

作　　者：Leigang Li Pengtang Wang Zifang Cheng Qi Shao Xiaoqing Huang 

机构地区：[1]State Key Laboratory of Physical Chemistry of Solid Surfaces,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China [2]College of Chemistry,Chemical Engineering and Materials Science,Soochow University,Suzhou 215123,China

出　　处：《Nano Research》2022年第2期1087-1093,共7页纳米研究（英文版）

基　　金：supported by the National Key R&D Program of China(Nos.2017YFA0208200 and 2016YFA0204100);the National Natural Science Foundation of China(No.22025108)。

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 IrO_(2) 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 H2S04,respectively,much lower than those of commercial catalysts.The Ir-Te NWs also show smaller Tafel slopes than commercial IrO_(2) 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 H_(2)SO_(4),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.

关 键 词：Ir TEMPLATE NANOWIRE water splitting oxygen evolution reaction 

分 类 号：TB3[一般工业技术—材料科学与工程]