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Transition‐Metal Oxides Anchored on Nitrogen‐Enriched Carbon Ribbons for High‐Performance Pseudocapacitors
Author(s) -
Pang Yuanchao,
Zhang Shuyang,
Chen Sheng,
Liang Jin,
Li Mingyan,
Ding Dawei,
Ding Shujiang
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201802951
Subject(s) - pseudocapacitor , supercapacitor , materials science , chemical engineering , oxide , capacitance , ternary operation , electrolyte , transition metal , non blocking i/o , metal , carbon fibers , electrode , amorphous solid , composite material , metallurgy , chemistry , composite number , biochemistry , computer science , engineering , programming language , catalysis , organic chemistry
Increasing demand for effective energy‐storage systems derived from low‐cost and ecofriendly raw materials has aroused wide concern. In this contribution, we propose nitrogen‐abundant amorphous micron‐sized carbon ribbons (AMCRs) originating from biomass raupo as a novel substrate due to their specific quasi 2D morphologies and outstanding dispersion ability. Owing to the innate nitrogen atoms on the surface of AMCRs, ultrathin binary and ternary metal oxide (NiO, CoO, and NiCo 2 O 4 ) nanosheets can be uniformly developed under benign conditions. These three composites were separately fabricated as electrodes for supercapacitors in a three‐electrode system and exhibited favorable activities. Among them, the ternary metal oxide composites NiCo 2 O 4 @AMCRs delivered the supreme specific capacitance of 1691 F g −1 and best cycling stability (89 % capacity retention over 10,000 cycles). Moreover, symmetric supercapacitors (NiCo 2 O 4 @AMCRs//NiCo 2 O 4 @AMCRs) were assembled inside sleeve devices with 2 m KOH aqueous electrolyte, which demonstrated admirable cyclic stability (79.1 % capacity retention over 8,000 cycles), and an excellent energy density of 26 Wh kg −1 at the power density of 1.8 kW kg −1 .