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Ultrahigh‐Performance Pseudocapacitor Electrodes Based on Transition Metal Phosphide Nanosheets Array via Phosphorization: A General and Effective Approach
Author(s) -
Zhou Kai,
Zhou Weijia,
Yang Linjing,
Lu Jia,
Cheng Shuang,
Mai Wenjie,
Tang Zhenghua,
Li Ligui,
Chen Shaowei
Publication year - 2015
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201503662
Subject(s) - materials science , nanosheet , supercapacitor , pseudocapacitor , capacitance , electrode , transition metal , current density , phosphide , nickel , chemical engineering , oxide , hydroxide , nanotechnology , catalysis , metallurgy , chemistry , organic chemistry , physics , quantum mechanics , engineering
In this study, a general and effective phosphorization strategy is successfully demonstrated to enhance supercapacitor performance of various transition metals oxide or hydroxide, such as Ni(OH) 2 , Co(OH) 2 , MnO 2 , and Fe 2 O 3 . For example, a 3D networked Ni 2 P nanosheets array via a facile phosphorization reaction of Ni(OH) 2 nanosheets is grown on the surface of a Ni foam. The Ni foam‐supported Ni 2 P nanosheet (Ni 2 P NS/NF) electrode shows a remarkable specific capacitance of 2141 F g −1 at a scan rate of 50 mV s −1 and remains as high as 1109 F g −1 even at the current density of 83.3 A g −1 . The specific capacitance is much larger than those of Ni(OH) 2 NS/NF (747 F g −1 at 50 mV s −1 ). Furthermore, the electrode retains a high specific capacitance of 1437 F g −1 even after 5000 cycles at a current density of 10 A g −1 , in sharp contrast with only 403 F g −1 of Ni(OH) 2 NS/NF at the same current density. The similar enhanced performance is observed for Ni 2 P powder, which eliminates the influence of nickel foam. The enhanced supercapacitor performances are attributed to the 3D porous nanosheets network, enhanced conductivity, and two active components of Ni 2+ and P δ− with rich valences of Ni 2 P.