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Hierarchical‐dimensional Material: A Co(OH) 2 Superstructure with Hybrid Dimensions for Enhanced Water Oxidation
Author(s) -
Qi Jing,
Chen Mingxing,
Zhang Wei,
Cao Rui
Publication year - 2019
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201900697
Subject(s) - electrocatalyst , nanosheet , materials science , electrochemistry , superstructure , nanotechnology , cobalt , catalysis , cobalt hydroxide , chemical engineering , electrode , chemistry , metallurgy , oceanography , geology , engineering , biochemistry
Herein, we propose the concept of hierarchical‐dimensional materials (HDMs), which are 3D superstructures built by low‐dimensional single‐crystalline substructures. HDMs combine the low‐ and high‐dimensional features and are a new class of promising functional materials toward electrochemical reactions. We reported a hierarchical‐dimensional cobalt hydroxide nanosheet assembly for electrocatalytic water oxidation. The assembling is 1D‐oriented, the substructures are 2D nanosheets, and 3D voids are created in the material. The as‐prepared material achieved superior electrocatalytic activity than isolated substructures. The better performance is associated with the improved mass transport, which is demonstrated by the analysis of kinetic‐controlled currents. This protocol can also be applied in preparing efficient catalysts on the surface of industrial current collectors. The proposed concept of HDMs might open a new area of functional materials in heterogeneous electrocatalysis.