塔菲尔方程
电催化剂
过电位
析氧
材料科学
电化学
纳米颗粒
分解水
化学工程
上部结构
催化作用
化学
纳米技术
电极
物理化学
光催化
有机化学
工程类
地质学
海洋学
作者
Yecan Pi,Nan Zhang,Shaojun Guo,Jun Guo,Xiaoqing Huang
出处
期刊:Nano Letters
[American Chemical Society]
日期:2016-06-02
卷期号:16 (7): 4424-4430
被引量:339
标识
DOI:10.1021/acs.nanolett.6b01554
摘要
Shape-controlled noble metal nanocrystals (NCs), such as Au, Ag, Pt, Pd, Ru, and Rh are of great success due to their new and enhanced properties and applications in chemical conversion, fuel cells, and sensors, but the realization of shape control of Ir NCs for achieving enhanced electrocatalysis remains a significant challenge. Herein, we report an efficient solution method for a new class of three-dimensional (3D) Ir superstructure that consists of ultrathin Ir nanosheets as subunits. Electrochemical studies show that it delivers the excellent electrocatalytic activity toward oxygen evolution reaction (OER) in alkaline condition with an onset potential at 1.43 V versus reversible hydrogen electrode (RHE) and a very low Tafel slope of 32.7 mV decade(-1). In particular, it even shows superior performance for OER in acidic solutions with the low onset overpotential of 1.45 V versus RHE and small Tafel slope of 40.8 mV decade(-1), which are much better than those of small Ir nanoparticles (NPs). The 3D Ir superstructures also exhibit good stability under acidic condition with the potential shift of less than 20 mV after 8 h i-t test. The present work highlights the importance of tuning 3D structures of Ir NCs for enhancing OER performance.
科研通智能强力驱动
Strongly Powered by AbleSci AI