Scalable, Binderless, and Carbonless Hierarchical Ni Nanodendrite Foam Decorated with Hydrous Ruthenium Dioxide for 1.6 V Symmetric Supercapacitors. Issue 6 (18th January 2016)

• Record Type: Journal Article
• Authors: Liu, Chueh; Li, Changling; Ahmed, Kazi; Wang, Wei; Lee, Ilkeun; Zaera, Francisco; Ozkan, Cengiz S.; Ozkan, Mihrimah
• Is Part Of: Advanced materials interfaces. Volume 3:Issue 6(2016)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2016-01-18
• Subjects: current collectors -- nanodendrite -- nickel -- RuO2 -- supercapacitors; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.201500503
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract : Herein, Ni nanodendrite (ND) with diameter ≈30–100 nm directly synthesized on Ni foam is utilized as an effective support for hydrous RuO2 in symmetric supercapacitors operated at 1.6 V. Highest specific capacitance 678.57 F g −1 can be achieved with energy density 60.32 Wh kg −1 . Even at large current density 100 A g −1, high energy density 19.73 Wh kg −1 can still be maintained with power density 40 kW kg −1 owing to the pristine metal nanostructure without any carbon additive and resistive binder. Long lifespan is shown with marginal performance improvement (≈4%) over 10 000 cycles. More importantly, the template‐less and self‐assembled Ni ND synthesis requires only low temperature and eco‐friendly chemicals, and can be simply dip‐coated with RuO2 nanoparticles. All of these render the RuO2 ‐Ni ND foam readily adapted into mass manufacturing without efforts. Abstract : Ni nanodendrite foam (NDF) is synthesized via a self‐assembly, acid etching, and hydrogen reduction process. NDF coated with hydrous RuO2 is utilized in symmetric supercapacitors showing a high potential window, superior energy and power density, and a long life cycle. The low temperature, template‐less, and environmentally benign process renders this electrode an outstanding option for industrial manufacturing.