Method of fabricating improved porous metallic material and resulting structure thereof
AssigneeCity University of Hong Kong
InventorsJie Zhang, Yang Yang Li, Jian Lu
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Abstract
A porous metallic material for making a structure is fabricated by subjecting the material structure to Surface Mechanical Attrition Treatment (SMAT) once, using the SMAT-treated structure as an electrode, and selectively etching away at least one metal component in the SMAT-treated structure once, thus forming an etched-away structure. Additional SMAT treatment and/or etching treatment to the etched away structure may be performed. The resulting structure has improved physical characteristics.
Claims9
A method of manufacture of an electrode having a porous metallic material and a coating of varying thickness on the porous material, comprising sequential steps of:
- i) providing, by way of melting, a structure made of an alloy system with at least a first metal component of Cu or Zn and a second metal component selected from the group consisting of Au, Ag, Pt and Cu, wherein the first metal component is more reactive than the second metal component;
- ii) subjecting the structure to Surface Mechanical Attrition Treatment (SMAT) for duration varying from 30 seconds to 12 minutes, forming a first SMAT-treated structure;
- iii) selectively etching away the more reactive first metal component in the SMAT-treated structure by immersion in an electrolyte of hydrochloric acid with or without a voltage field applied, thus forming a first etched away or fabricated porous structure of Au, Ag, Pt or Cu;
- and
- iv) electrochemically depositing electroactive material onto the fabricated porous Au, Ag, Pt or Cu with varied deposition amount.
Dependencies are inferred from the claim text.