Open AccessPreparation of hierarchical hollow structures assembled from porous NiCo 2 O 4 nanosheets for diesel soot elimination
Author(s) -
Yu Yifu,
Ma Qinglang,
Tan Chaoliang,
Wang Huan,
Hu Zhaoning,
Zhang Qichun,
Zhang Hua,
Zhang Bin
Publication year - 2020
Publication title -
ecomat
Language(s) - English
Resource type - Journals
ISSN - 2567-3173
DOI - 10.1002/eom2.12041
Subject(s) - soot , catalysis , kirkendall effect , diesel exhaust , microstructure , chemical engineering , porosity , materials science , diesel fuel , annealing (glass) , diesel particulate filter , nanotechnology , combustion , chemistry , organic chemistry , metallurgy , composite material , engineering
Construction of catalysts with designed microstructures is critically important in heterogeneous catalysis. The soot catalytic oxidation was considered as one of the most efficient methods for the diesel soot elimination, but its development has been hindered by the lack of efficient catalysts. The hierarchically porous materials with well‐defined microstructures are expected to perform high‐catalytic activity for the large‐sized soot particulates elimination. Herein, we report a method to prepare a novel hierarchical hollow structure (HHS) assembled from porous NiCo 2 O 4 NSs, referred to as NiCo 2 O 4 HHS. The cation‐exchange reaction and Kirkendall effect induce the conversion from the Co‐Asp (Asp: aspartic acid) fibers to the Co,Ni‐Asp HHSs. The NiCo 2 O 4 HHSs are prepared through annealing the Co,Ni‐Asp HHSs. As a proof‐of‐concept application, the unique NiCo 2 O 4 HHS is used as a catalyst to eliminate the soot particulates and exhibits superior performance, which could be attributed to the improved soot‐catalyst contact, sufficient active sites and strong active oxygen species.