THESIS
2022
1 online resource (xix, 122 pages) : illustrations (some color)
Abstract
Bi-continuous nanoporous metals of continuous ligaments and pores have been applied
in a wild range of applications for their high specific areas and good electrical
conductivities. Electrochemical dealloying, the most common method to fabricate
nanoporous metals, selectively dissolve one or more components from an alloy, via a
mechanism of percolation dissolution. Recently, many studies demonstrated the
generality of percolation dissolution, including the applications in liquid metal
dealloying, vapor phase dealloying, and reduction-induced dealloying. In this
dissertation, we will broaden the scope of percolation dissolution to fabricate new bicontinuous
structures and to explain practically important battery processes. In Chapter
2, we realize the fabrication of monolithic bi-continu...[
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Bi-continuous nanoporous metals of continuous ligaments and pores have been applied
in a wild range of applications for their high specific areas and good electrical
conductivities. Electrochemical dealloying, the most common method to fabricate
nanoporous metals, selectively dissolve one or more components from an alloy, via a
mechanism of percolation dissolution. Recently, many studies demonstrated the
generality of percolation dissolution, including the applications in liquid metal
dealloying, vapor phase dealloying, and reduction-induced dealloying. In this
dissertation, we will broaden the scope of percolation dissolution to fabricate new bicontinuous
structures and to explain practically important battery processes. In Chapter
2, we realize the fabrication of monolithic bi-continuous nanoporous AgCl, produced
through the selective dissolution of the NaCl component in Ag
1-xNa
xCl solid solution.
The process displays a parting limit and coarsening similar to electrochemical
dealloying. In Chapter 3, we demonstrate that the electrochemical reduction of a ZnO
anode, the charging process in alkaline Zn batteries, is also a process of percolation
dissolution toward the formation of nanoporous Zn, whose condition of formation can be explained by the percolation threshold. In Chapters 4 & 5, we optimize this particular
case of percolation dissolution for the fabrication of a uniform nanoporous Zn anode
and apply it to a high-performance Zn-NiOOH battery. By analyzing the structural and
compositional evolution of this anode, we show that its high stability under a deep depth
of discharging is connected to the unique structure of nanoporous metal.
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