Nanofabrication of hollowed-out Au@AgPt core-frames via selective carving of silver and deposition of platinum

Author(s): Chang Xia ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Wei He ⁶ ^, ³ ^, ⁴ ^, ⁵ , Peng Fei Gao ⁶ ^, ³ ^, ⁴ ^, ⁵ , Jia Ru Wang ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Zheng Mao Cao ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Yuan Fang Li ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Yi Wang ⁷ ^, ⁸ ^, ⁹ ^, ¹⁰ ^, ⁵ , Cheng Zhi Huang ⁶ ^, ³ ^, ⁴ ^, ⁵

Publication date (Electronic): 2020

Journal: Chemical Communications

Publisher: Royal Society of Chemistry (RSC)

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Abstract

Nanofabrication of a hollowed-out Au@AgPt core-frame is presented, which is based on the selective deposition of Pt atoms on the active edges of the cubes and dissolution of Ag atoms from the {100} facets.

Abstract

Here, a hollowed-out Au@AgPt core-frame nanostructure is carved in the presence of PtCl ₆ ²⁻ via galvanic replacement (GR) reaction, during which the dissolution of Ag atoms from the {100} facets and the deposition of Pt atoms on the active edges of the nanocubes occur. Both ex situ and in situ monitoring of the plasmonic and structural evolutions at the single-particle level, confirmed also by theoretical simulations, shows a three-phase mechanism involved.

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Formation of nickel cobalt sulfide ball-in-ball hollow spheres with enhanced electrochemical pseudocapacitive properties.

Laifa Shen, Le Yu, Hao Bin Wu … (2015)

While the synthesis of hollow structures of transition metal oxides is well established, it is extremely challenging to fabricate complex hollow structures for mixed transition metal sulfides. Here we report an anion exchange method to synthesize a complex ternary metal sulfides hollow structure, namely nickel cobalt sulfide ball-in-ball hollow spheres. Uniform nickel cobalt glycerate solid spheres are first synthesized as the precursor and subsequently chemically transformed into nickel cobalt sulfide ball-in-ball hollow spheres. When used as electrode materials for electrochemical capacitors, these nickel cobalt sulfide hollow spheres deliver a specific capacitance of 1,036 F g(-1) at a current density of 1.0 A g(-1). An asymmetric supercapacitor based on these ball-in-ball structures shows long-term cycling performance with a high energy density of 42.3 Wh kg(-1) at a power density of 476 W kg(-1), suggesting their potential application in high-performance electrochemical capacitors.

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25th anniversary article: galvanic replacement: a simple and versatile route to hollow nanostructures with tunable and well-controlled properties.

Xiaohu Xia, Yi Wang, Aleksey Ruditskiy … (2013)

This article provides a progress report on the use of galvanic replacement for generating complex hollow nanostructures with tunable and well-controlled properties. We begin with a brief account of the mechanistic understanding of galvanic replacement, specifically focused on its ability to engineer the properties of metal nanostructures in terms of size, composition, structure, shape, and morphology. We then discuss a number of important concepts involved in galvanic replacement, including the facet selectivity involved in the dissolution and deposition of metals, the impacts of alloying and dealloying on the structure and morphology of the final products, and methods for promoting or preventing a galvanic replacement reaction. We also illustrate how the capability of galvanic replacement can be enhanced to fabricate nanomaterials with complex structures and/or compositions by coupling with other processes such as co-reduction and the Kirkendall effect. Finally, we highlight the use of such novel metal nanostructures fabricated via galvanic replacement for applications ranging from catalysis to plasmonics and biomedical research, and conclude with remarks on prospective future directions.

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Complex Hollow Nanostructures: Synthesis and Energy-Related Applications.

Hao Bin Wu, Le Yu, Han Hu … (2017)

Hollow nanostructures offer promising potential for advanced energy storage and conversion applications. In the past decade, considerable research efforts have been devoted to the design and synthesis of hollow nanostructures with high complexity by manipulating their geometric morphology, chemical composition, and building block and interior architecture to boost their electrochemical performance, fulfilling the increasing global demand for renewable and sustainable energy sources. In this Review, we present a comprehensive overview of the synthesis and energy-related applications of complex hollow nanostructures. After a brief classification, the design and synthesis of complex hollow nanostructures are described in detail, which include hierarchical hollow spheres, hierarchical tubular structures, hollow polyhedra, and multi-shelled hollow structures, as well as their hybrids with nanocarbon materials. Thereafter, we discuss their niche applications as electrode materials for lithium-ion batteries and hybrid supercapacitors, sulfur hosts for lithium-sulfur batteries, and electrocatalysts for oxygen- and hydrogen-involving energy conversion reactions. The potential superiorities of complex hollow nanostructures for these applications are particularly highlighted. Finally, we conclude this Review with urgent challenges and further research directions of complex hollow nanostructures for energy-related applications.