Journal
NANO LETTERS
Volume 13, Issue 10, Pages 4610-4619Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl401387s
Keywords
Titanium dioxide; hydrothermal treatment; multiwalled carbon nanotubes; electrochemical capacitor; layer-by-layer self-assembly; faradiiic reaction
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Funding
- MRSEC Program of the National Science Foundation [DMR-0819762]
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- National Science Foundation Graduate Research Fellowship
- National Science Foundation Center [CHE-0802907]
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Next-generation electrochemical energy storage for integrated microsystems and consumer electronic devices requires novel electrode materials with engineered architectures to meet the requirements of high performance, low cost, and robustness. However, Conventional electrode fabrication processes such as doctor bladirg afford limited control over the electrode thickness and structure at the nanoscale and require the incorporation of insulating binder and other additives, which can promote agglomeration and reduce active surface area, limiting the inherent advantages attainable from nanoscale materials. We he engineered a route for the synthesis of highly stable, sub-8 nm TiO2 nanoparticles and their subsequent incorporation with acid-functionalized multiwalled carbon nanotubes (MWNTs) into nanostructured electrodes using aqueous-based layer-by-layer electrostatic self-assembly. Using this approach, binder-free thin film electrodes with highly controllable thicknesses up to the micrometer scale were developed with well-dispersed, nonagglomerated TiO2 nanoparticles on MWNTs. Upon testing in an Li electrochemical half-cell, these electrodes demonstrate high capacity (>150 mAhig(electrode) at 0.1 A/g(electrode)), good rate capability (>100 mAhigelectrode up to 1 A/g electrode) and nearly no capacity loss up to 200 cycles for electrodes with thicknesses up to 1480 nm, indicating their promise as thin-film negative electrodes for future Li storage applications.
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