Hierarchical One-Dimensional Ammonium Nickel Phosphate Microrods for High-Performance Pseudocapacitors

High-performance electrochemical capacitors will drive the next-generation portable, flexible and wearable electronics. Unlike the conventional all-carbon supercapacitors (electric double layer capacitors, EDLC) with high power but poor energy density, pseudocapacitors capitalize the high energy den...

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Bibliographic Details
Published in:Scientific reports 2015-12, Vol.5 (1), p.17629-17629, Article 17629
Main Authors: Raju, Kumar, Ozoemena, Kenneth I.
Format: Article
Language:English
Subjects:
639/301/299
639/638/161
639/925/357/1016
Ammonium
Capacitance
Electrochemistry
Electrodes
Electrolytes
Energy storage
Humanities and Social Sciences
Morphology
multidisciplinary
Nickel
Redox reactions
Science
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Summary:High-performance electrochemical capacitors will drive the next-generation portable, flexible and wearable electronics. Unlike the conventional all-carbon supercapacitors (electric double layer capacitors, EDLC) with high power but poor energy density, pseudocapacitors capitalize the high energy density inherent to reversible redox reactions and provide a facile means to enhancing the energy ratings of supercapacitors. The high length-to-diameter ratio and anisotropic character of 1-D architecture makes them suitable for use in energy storage. For the first time, we report 1-D microrod structures (~ 36 nm width) of ammonium nickel phosphate hydrate (ANP mr ) as a pseudocapacitor with high energy rating and power handling. To confirm the data, the ANP mr -based pseudocapacitor was subjected to various configurations (i.e., half-cell, symmetric, asymmetric and flexible all-solid-state) and in each case it gave excellent values compared to any accessible literature to date. We clearly demonstrate that a flexible all-solid-state ANP mr -based pseudocapacitor achieved high areal capacitance of 66 mF cm −2 with extra-ordinary energy (21.2 mWh cm −2 ) and power (12.7 mW cm −2 ) densities. This work opens doors for a facile, robust and scalable preparation strategy for low-cost, earth-abundant electrode materials for high-performance pseudocapacitors.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep17629