Hierarchical nanoporous metal/metal-oxide composite by dealloying metallic glass for high-performance energy storage

Abstract

A free-standing nanoporous YNiCo metal/metal-oxide composite with hierarchical porosity is fabricated by chemically dealloying Al85Y6Ni6Co3 metallic glass in alkaline solutions. The mixed core-shell-like metal/metal-oxide structure formed during dealloying due to the active properties of these metals. Time-dependent etching experiments suggest that the formation of large and small pores occur simultaneously, which may be related to the different dissolution rate of Al at different sites. The nanoporous composite with a highly conductive metal core exhibits a high areal capacitance. Moreover, this strategy can be extended to fabricate other nanoporous composites considering that the composition of metallic glass can be easily tuned.

Dealloying monolithic Pt-Cu alloy to wire-like nanoporous structure for electrocatalysis and electrochemical sensing

“…Only some cracks appear after the dealloying. This result is in good agreement with a general understanding that dealloying single-phase binary alloy with a suitable composition (noble component: ∼15-45 at.%) does not affect the grain size and crystal orientation [19]. For the dealloyed Pt 3 Cu 97 , it was interesting to observe that well-aligned microcale wire-like structure with diameters from ∼1 to 3 m formed (Fig.…”

“…However, the precise control over the alloy composition and structure uniformity for activity optimization is still quite challenging by these bottom-up reduction methods. In recent years, dealloying has shown obvious advantage in fabricating nanostructured alloy catalysts with nanoporous ligament-pore structure [16][17][18][19][20]. Different from these bottom-up wet chemical reduction methods, dealloying can more precisely control the alloy ratio by selective removal of one component from a ternary alloy [21,22] or controlled dealloying a binary alloy [23,24].…”

Dealloying-driven synthesis of sea-urchin like titanate nanowires and hierarchically porous anatase TiO 2 nanospindles with enhanced photocatalytic performance

“…During dealloying process, Al phase in the Al-Ti alloys selectively dissolved into the NaOH solution, which can remain the large-sized channels. And the Al in Al 3 Ti phase dissolved continuously due to its high content and chemical activity in the NaOH solution [37]. Besides, the fast removal of Al would cause the diffusion of Ti atoms [38], which tend to react with the Na + and OH − ions.…”

“…Comparatively, dealloying as a simple and efficient method has received growing interests in the past decade. Dealloying (i.e., selectively removing one or more active metals from alloys) has been proven to be effective in producing free-standing three-dimensional (3D) nanoporous metals in large amount [32][33][34][35][36][37][38][39][40].…”

Hybrid MnO/Ni Li-ion Battery Anode Material with Enhanced Capacity Retention

“…Hybrid materials are interesting and technologically very significant group of materials. They find widespread use in fields such as electrochemical storage and conversion [1][2][3][4][5][6][7][8][9], mechanical [10][11], optical [12], thermal [13] applications. In electrochemical applications such batteries and fuel cells, hybrid materials are composed of one electronically conducting and one ionically conducting (typically Li + , H + or O 2-) component.…”