Highly regioselective O-demethylation of aromatic ethers related to the bioconversion of lignin was achieved by the H2O2-dependent engineered P450BM3 enzymes with assistance of a dual-functional small molecule (DFSM) for the first time.
The conversion reaction
of lithia can push up the capacity limit
of tin oxide-based anodes. However, the poor reversibility limits
the practical applications of lithia in lithium-ion batteries. The
latest reports indicate that the reversibility of lithia has been
appropriately promoted by compositing tin oxide with transition metals.
The underlying mechanism is not revealed. To design better anodes,
we studied the nanostructured metal/Li2O interfaces through
atomic-scale modeling and proposed a porous nanoframe structure of
Mn/Sn binary oxides. The first-principles calculation implied that
because of a low interface energy of metal/Li2O, Mn forms
smaller particles in lithia than Sn. Ultrafine Mn nanoparticles surround
Sn and suppress the coarsening of Sn particles. Such a composite design
and the resultant interfaces significantly enhance the reversible
Li-ion storage capabilities of tin oxides. The synthesized nanoframes
of manganese tin oxides exhibit an initial capacity of 1620.6 mA h
g–1 at 0.05 A g–1. Even after
1000 cycles, the nanoframe anode could deliver a capacity of 547.3
mA h g–1 at 2 A g–1. In general,
we demonstrated a strategy of nanostructuring interfaces with low
interface energy to enhance the Li-ion storage capability of binary
tin oxides and revealed the mechanism of property enhancement, which
might be applied to analyze other tin oxide composites.
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