过电位
材料科学
电催化剂
纳米棒
析氧
化学工程
多孔性
分解水
互连性
纳米技术
电极
水溶液
催化作用
电化学
光催化
复合材料
物理化学
化学
有机化学
人工智能
计算机科学
工程类
作者
Shanhong Wan,Jing Qi,Wei Zhang,Weina Wang,Shaokang Zhang,Kaiqiang Liu,Haoquan Zheng,Junliang Sun,Shuangyin Wang,Rui Cao
标识
DOI:10.1002/adma.201700286
摘要
The development of new materials/structures for efficient electrocatalytic water oxidation, which is a key reaction in realizing artificial photosynthesis, is an ongoing challenge. Herein, a Co(OH)F material as a new electrocatalyst for the oxygen evolution reaction (OER) is reported. The as-prepared 3D Co(OH)F microspheres are built by 2D nanoflake building blocks, which are further woven by 1D nanorod foundations. Weaving and building the substructures (1D nanorods and 2D nanoflakes) provides high structural void porosity with sufficient interior space in the resulting 3D material. The hierarchical structure of this Co(OH)F material combines the merits of all material dimensions in heterogeneous catalysis. The anisotropic low-dimensional (1D and 2D) substructures possess the advantages of a high surface-to-volume ratio and fast charge transport. The interconnectivity of the nanorods is also beneficial for charge transport. The high-dimensional (3D) architecture results in sufficient active sites per the projected electrode surface area and is favorable for efficient mass diffusion during catalysis. A low overpotential of 313 mV is required to drive an OER current density of 10 mA cm-2 on a simple glassy carbon (GC) working electrode in a 1.0 m KOH aqueous solution.
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