材料科学
析氧
电极
电化学
多孔性
电流密度
化学工程
纳米技术
扫描电子显微镜
比表面积
分解水
催化作用
复合材料
物理化学
生物化学
化学
物理
量子力学
光催化
工程类
作者
Asim Riaz,Zelio Fusco,Felipe Kremer,Bikesh Gupta,Doudou Zhang,C. Jagadish,Hark Hoe Tan,Siva Krishna Karuturi
标识
DOI:10.1002/aenm.202303001
摘要
Abstract Crucial advancements in versatile catalyst systems capable of achieving high current densities under industrial conditions, bridging the gap between fundamental understanding and practical applications, are pivotal to propel the hydrogen economy forward. In this study, vertically oriented hierarchically multiscale nanoflakes of NiFeCo electrocatalysts are presented, developed by surface modification of a porous substrate with nano‐structured nickel. The resulting electrodes achieve remarkably low overpotentials of 139 mV at 10 mAcm −2 and 248 mV at 500 mAcm −2 . Further, scaled‐up electrodes are implemented in a water‐splitting electrolyser device exhibiting a stable voltage of 1.82 V to deliver a constant current density of 500 mA cm −2 for over 17 days. Moreover, the role of the unique structures on electrochemical activity is systematically investigated by fractal analysis, involving computation of structure factors such as Minkowski connectivity, fractal dimension, and porosity using scanning electron microscope images. It is found that such structures offer higher surface area than typical layered double hydroxide structures due to morphological coherence that results in a superhydrophilic surface, while the base Ni layer boosts the charge transfer. This study demonstrates a Ni/NiFeCo(OH) x heterostructure with highly porous morphology, a key to unlocking extremely efficient oxygen evolution reaction activity with exceptional stability. Moreover, fractal analysis is presented as a valuable tool to evaluate the electrochemical performance of catalysts for their structured morphology.
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