塔菲尔方程
过电位
氢氧化物
钴
镍
电催化剂
析氧
层状双氢氧化物
材料科学
催化作用
化学工程
无机化学
比表面积
兴奋剂
分解水
纳米技术
化学
电极
电化学
冶金
物理化学
生物化学
光电子学
工程类
光催化
作者
Ni Luh Wulan Septiani,Yusuf Valentino Kaneti,Yanna Guo,Brian Yuliarto,Xuchuan Jiang,Yusuke Ide,Nugraha Nugraha,Hermawan Kresno Dipojono,Aibing Yu,Yoshiyuki Sugahara,Dmitri Golberg,Yusuke Yamauchi
出处
期刊:Chemsuschem
[Wiley]
日期:2019-08-08
卷期号:13 (6): 1645-1655
被引量:116
标识
DOI:10.1002/cssc.201901364
摘要
Abstract Layered double hydroxides (LDHs) containing first‐row transition metals such as Fe, Co, and Ni have attracted significant interest for electrocatalysis owing to their abundance and excellent performance for the oxygen evolution reaction (OER) in alkaline media. Herein, the assembly of holey iron‐doped nickel‐cobalt layered double hydroxide (NiCo‐LDH) nanosheets (‘holey nanosheets’) is demonstrated by employing uniform Ni–Co glycerate spheres as self‐templates. Iron doping was found to increase the rate of hydrolysis of Ni–Co glycerate spheres and induce the formation of a holey interconnected sheet‐like structure with small pores (1–10 nm) and a high specific surface area (279 m 2 g −1 ). The optimum Fe‐doped NiCo‐LDH OER catalyst showed a low overpotential of 285 mV at a current density of 10 mA cm −2 and a low Tafel slope of 62 mV dec −1 . The enhanced OER activity was attributed to (i) the high specific surface area of the holey nanosheets, which increases the number of active sites, and (ii) the improved kinetics and enhanced ion transport arising from the iron doping and synergistic effects.
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