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Bacterial ferritin from Azotobacter vinelandii (AvBFo) has a function in H2 uptake. The Fe3+ reduction on the surface of the iron core from AvBFo is accompanied simultaneously by H2 uptake, with a maximum activity of H2 uptake of 450 H2/AvBFo. A reduction potential of -402 mV for iron reduction on the surface of the core is found. A shift to the red the protein absorbance peaks ranging from 280 to 290 nm is observed between pH 5 and 9 under 100% H2 reduction. The reduction potential for iron release becomes negative at a rate of 0.025 mV/Fe2+ released. The kinetics of iron release on the surface of the core is a first-order reaction.

A kind of multifunctional nanocomposite coating based on setae-spatulae structure of gecko is innovatively proposed, which was prepared by blending method. Potential polarization curve, electrochemical impedance spectroscopy (EIS) and salt spray test were analyzed respectively to analyze the corrosion inhibition effects. Results indicated that the impedance at low frequency region of epoxy resin (EP)/ZnO/Fe 2 O 3 (γ-type) nanocomposite coating was the highest, which is 5.17 times of that of epoxy resin. Nanocomposite coating with multi-scale and multi-component nanoparticles has better pulverization resistance than blank epoxy resin and one-component coatings. The degree of protection of EP/ZnO/Fe 2 O 3 (γ-type) was highest.

Automobile exhaust is one of the sources of PM2.5, which can merely be catalytically decomposed by a "post-treatment" three-way catalytic device at present. Afront-treatment device based on rare earth-alumina nanocomposite in gasoline was innovatively introduced. nanoalumina and rare earth elements are function as the backbone and carrier, respectively. Microscopic molecular assembly and catalytic mechanism were studied to synthesize metastable ordered mesoporous with high degree of aggregation. Mesh filter of rare earth-alumina nanocatalytic composite with self-sustained release function is formed by sintering, which can be solidified in an automotive air intake system. Results show that rare earth-aluminum nanocomposite contributes to catalytic combustion and makes combustion more complete. Moreover, it has a better effect of reducing PM2.5 than a "post-treatment" device in terms of catalytic effect.