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As an important raw material, TiO2 has been widely used in industries closely related to human life, such as coatings, sunscreens, and food additives
.
In 2019, the global market size reached 16.
64 billion U.
S.
dollars, and the compound growth rate in the next five years is expected to be as high as 7.
6%
.
However, these TiO2 materials mainly exist in the form of powder on the macroscopic level, which can easily enter the human body through the respiratory system, thereby causing health risks
.
Therefore, on February 18, 2020, the European Union officially listed "mixtures in powder form containing 1% or more of titanium dioxide which is in the form of or incorporated in particles with aerodynamic diameter ≤10 μm" as a category two carcinogen
.
In addition, these nanomaterials are difficult to recycle, and once released into the environment, they will be biologically toxic to animals and plants in nature
.
Therefore, it is a challenging task to develop and use self-supporting TiO2 materials with high safety factor and easy recycling
.
? Recently, Academician Yu Jianyong, Professor Ding Bin, and Professor Liu Yitao of the Textile Technology Innovation Center of Donghua University reported on a new form of TiO2 body-ultra-light and highly elastic TiO2 nanofiber aerogel
.
They used flexible TiO2 nanofibers as the building block, a small amount of SiO2 sol as a chemical crosslinking agent, and used the method of freeze molding to realize the directional assembly of TiO2 nanofibers, and prepared TiO2 nanofibers with ordered cell structure.
Glue
.
The nanofiber aerogel can be repeatedly compressed at a strain of up to 40% without obvious plastic deformation, and exhibits excellent dynamic mechanical properties
.
In addition, the nanofiber aerogel also has ultra-low bulk density (0.
5 mg cm-3) and ultra-high porosity (>99%)
.
Further, abundant oxygen vacancies are generated through the reduction of lithium metal, thereby effectively regulating the electronic structure of TiO2, and its electrical conductivity is as high as 38.
2 mS cm–1
.
The ordered cell structure of TiO2 nanofiber aerogel makes it have ultra-low bulk density, ultra-high porosity and excellent elasticity.
TiO2 nanofiber aerogel reduced by lithium metal has excellent electrical conductivity and optical properties ? As a proof of concept, the researchers used the nanofiber aerogel as a new type of self-supporting electrocatalyst for environmental nitrogen fixation, showing excellent electrocatalytic activity
.
In addition, the nanofiber aerogel exhibits excellent durability in acidic, alkaline and neutral electrolytes
.
Density functional theory (DFT) calculations show that the presence of oxygen vacancies can promote the adsorption and activation of nitrogen, thereby helping to improve electrocatalytic activity
.
In addition to the application in the field of electrocatalysis, the highly conductive, ultra-light and highly elastic TiO2 nanofiber aerogel also has broad application prospects in the fields of energy storage, photocatalysis, and flexible electronic devices
.
? Related work was published on Angewandte Chemie International Edition, DOI: 10.
1002/anie.
202010110 with the title "Conductive and Elastic TiO2 Nanofibrous Aerogels: A New Concept toward Self-Supported Electrocatalysts with Superior Activity and Durability"
.
The first author of the paper is Meng Zhang, a doctoral student in the Textile College of Donghua University, and the co-corresponding authors are Professor Ding Bin and Professor Liu Yitao
.
This work has been strongly funded by the National Natural Science Foundation of China, the Shanghai Natural Science Foundation, the Shanghai Municipal Education Commission, and the Donghua University Inspirational Project
.
.
In 2019, the global market size reached 16.
64 billion U.
S.
dollars, and the compound growth rate in the next five years is expected to be as high as 7.
6%
.
However, these TiO2 materials mainly exist in the form of powder on the macroscopic level, which can easily enter the human body through the respiratory system, thereby causing health risks
.
Therefore, on February 18, 2020, the European Union officially listed "mixtures in powder form containing 1% or more of titanium dioxide which is in the form of or incorporated in particles with aerodynamic diameter ≤10 μm" as a category two carcinogen
.
In addition, these nanomaterials are difficult to recycle, and once released into the environment, they will be biologically toxic to animals and plants in nature
.
Therefore, it is a challenging task to develop and use self-supporting TiO2 materials with high safety factor and easy recycling
.
? Recently, Academician Yu Jianyong, Professor Ding Bin, and Professor Liu Yitao of the Textile Technology Innovation Center of Donghua University reported on a new form of TiO2 body-ultra-light and highly elastic TiO2 nanofiber aerogel
.
They used flexible TiO2 nanofibers as the building block, a small amount of SiO2 sol as a chemical crosslinking agent, and used the method of freeze molding to realize the directional assembly of TiO2 nanofibers, and prepared TiO2 nanofibers with ordered cell structure.
Glue
.
The nanofiber aerogel can be repeatedly compressed at a strain of up to 40% without obvious plastic deformation, and exhibits excellent dynamic mechanical properties
.
In addition, the nanofiber aerogel also has ultra-low bulk density (0.
5 mg cm-3) and ultra-high porosity (>99%)
.
Further, abundant oxygen vacancies are generated through the reduction of lithium metal, thereby effectively regulating the electronic structure of TiO2, and its electrical conductivity is as high as 38.
2 mS cm–1
.
The ordered cell structure of TiO2 nanofiber aerogel makes it have ultra-low bulk density, ultra-high porosity and excellent elasticity.
TiO2 nanofiber aerogel reduced by lithium metal has excellent electrical conductivity and optical properties ? As a proof of concept, the researchers used the nanofiber aerogel as a new type of self-supporting electrocatalyst for environmental nitrogen fixation, showing excellent electrocatalytic activity
.
In addition, the nanofiber aerogel exhibits excellent durability in acidic, alkaline and neutral electrolytes
.
Density functional theory (DFT) calculations show that the presence of oxygen vacancies can promote the adsorption and activation of nitrogen, thereby helping to improve electrocatalytic activity
.
In addition to the application in the field of electrocatalysis, the highly conductive, ultra-light and highly elastic TiO2 nanofiber aerogel also has broad application prospects in the fields of energy storage, photocatalysis, and flexible electronic devices
.
? Related work was published on Angewandte Chemie International Edition, DOI: 10.
1002/anie.
202010110 with the title "Conductive and Elastic TiO2 Nanofibrous Aerogels: A New Concept toward Self-Supported Electrocatalysts with Superior Activity and Durability"
.
The first author of the paper is Meng Zhang, a doctoral student in the Textile College of Donghua University, and the co-corresponding authors are Professor Ding Bin and Professor Liu Yitao
.
This work has been strongly funded by the National Natural Science Foundation of China, the Shanghai Natural Science Foundation, the Shanghai Municipal Education Commission, and the Donghua University Inspirational Project
.