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Seed‐Assisted Synthesis of Hierarchical α‐MnO 2 /Nitride TiO 2 Taper Nanorod Arrays on Carbon Fiber Paper with Enhanced Supercapacitor Performance
Author(s) -
Su Xiaohui,
Feng Guangwen,
Yu Lin,
Li Qiong,
Zhang Huanhua,
Song Wei,
Hu Guanghui,
Pan Zhanchang
Publication year - 2019
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201800933
Subject(s) - materials science , supercapacitor , nanorod , capacitance , electrolyte , chemical engineering , electrode , carbon fibers , hydrothermal circulation , nanotechnology , fiber , composite number , composite material , chemistry , engineering
A hierarchical porous α‐MnO 2 nanowire network and long nitrided TiO 2 (N‐TiO 2 ) taper nanorod arrays are grown on seeded carbon fiber paper (SCFP) by a two‐step hydrothermal synthesis. The α‐MnO 2 /N‐TiO 2 /SCFP electrode shows a high areal capacitance of 400.3 mF cm −2 at 1.34 mA cm −2 , excellent cycling stability with no capacitance reduction after 5000 cycles, and good rate capability. The areal capacitance of α‐MnO 2 /N‐TiO 2 /SCFP is much larger than that of α‐MnO 2 /N‐TiO 2 grown on carbon fiber paper without seeding (α‐MnO 2 /N‐TiO 2 /CFP). The enhanced performance can be attributed to the more open longer taper nanorod structure to achieve more favorable electrolyte ion access and provide larger specific surface allowing for improved and effective mass loading of active materials. The α‐MnO 2 /N‐TiO 2 /SCFP may provide a general method for increasing the areal capacitance of composite electrode by adjusting the structure of the nanostructured current collectors using a simple and effective seeded hydrothermal synthesis.