Eco-Friendly, Direct Deposition of Metal Nanoparticles on Graphite for Electrochemical Energy Conversion and Storage

被引:21
作者
Pandey, Rakesh K. [1 ]
Chen, Linfeng [1 ]
Teraji, Satoshi [2 ]
Nakanishi, Hideyuki [2 ]
Soh, Siowling [1 ]
机构
[1] Natl Univ Singapore, Dept Chem & Biomol Engn, 4 Engn Dr 4, Singapore 117585, Singapore
[2] Kyoto Inst Technol, Dept Macromol Sci & Engn, Grad Sch Sci & Technol, Kyoto 6068585, Japan
关键词
graphite; energy conversion; supercapacitor; electrocatalysis; metal nanoparticles; IN-SITU SYNTHESIS; GOLD NANOPARTICLES; FUNCTIONAL-GROUPS; WORK FUNCTION; CARBON; ELECTRODES; OXIDATION; ACID; INTERCALATION; REDUCTION;
D O I
10.1021/acsami.9b09273
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Simple, green, and energy-efficient methods for preparing electroactive materials used to generate and store renewable energy are important for a sustainable future. In this study, we showed that noble and certain non-noble metal nanoparticles can be deposited on graphite without the aid of any reducing agent. This method of reducing metal ions to metal nanoparticles by graphite involves only one step (i.e., immersion into a solution) and one chemical (i.e., a metal salt). Hence, the method is exceedingly simple, green, and does not require any energy input. Large amounts of metal nanoparticles are generated both on the surface and deep into the bulk of graphite (similar to 100 mu cm). Despite the simplicity of this method, the metal deposited on graphite showed good electrocatalytic performance for ethanol oxidation and oxygen evolution reactions and also functioned as electrodes for supercapacitors. This method is thus ideal for preparing electrocatalytic materials and electrochemical energy storage devices due to its simplicity and environmental sustainability. The simplicity of the method is due to the inherent reducing potential of graphite (i.e., a material that is generally perceived as inert). Results from analyses showed that functionalization of the reactive edges in the regions of defects allowed the graphite to serve as a reducing agent. Increasing the amount of defects (e.g., via chemical or simple mechanical treatments) is shown to be the fundamental principle for increasing the reactivity of graphite.
引用
收藏
页码:36525 / 36534
页数:10
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