Galvanic Replacement Synthesis of Metal Nanostructures: Bridging the Gap between Chemical and Electrochemical Approaches

• DOI: 10.1021/acs.accounts.3c00067
• Publication Date: 2023-03-26T17:52:45Z
• Authors: Haoyan Cheng; Chenxiao Wang; Dong Qin; Younan Xia
• Keywords: Galvanic cell

ConspectusGalvanic replacement synthesis involves oxidation and dissolution of atoms from a substrate while the salt precursor to another material with higher reduction potential is reduced deposited on substrate. The driving force or spontaneity such comes difference in between redox pairs involved. Both bulk micro/nanostructured materials have been explored as substrates for galvanic synthesis. use can significantly increase surface area, offering immediate advantages over conventional electrosynthesis. also be intimately mixed solution phase, resembling setting typical chemical tends directly substrate, just like situation an Different electrosynthesis where two electrodes are spatially separated by electrolyte solution, cathodes anodes situated same surface, albeit at different sites, even Since reactions occur sites those deposition reactions, one control growth pattern newly access nanostructured diverse controllable compositions, shapes, morphologies single step. Galvanic has successfully applied types substrates, including made crystalline amorphous materials, well metallic nonmetallic materials. Depending involved, take nucleation patterns, resulting but well-controlled nanomaterials sought variety studies applications.In this Account, we recapitulate our efforts past decades fabricating metal nanostructures broad range applications leveraging unique capability We begin brief introduction fundamentals nanocrystals precursors, followed discussion roles played capping agents achieving site-selected carving fabrication various bimetallic nanostructures. Two examples based Ag-Au Pd-Pt systems selected illustrate concept mechanism. then highlight recent work involving focus protocol, mechanistic understanding, experimental Au- Pt-based tunable morphologies. Finally, showcase properties derived biomedicine catalysis. offer some perspectives challenges opportunities emerging field research.