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An Approach to Preparing Ni–P with Different Phases for Use as Supercapacitor Electrode Materials
Author(s) -
Wang Dan,
Kong LingBin,
Liu MaoCheng,
Luo YongChun,
Kang Long
Publication year - 2015
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.201502269
Subject(s) - supercapacitor , capacitance , materials science , power density , annealing (glass) , nickel , electrochemistry , electrode , phosphide , ball mill , energy storage , chemical engineering , current density , analytical chemistry (journal) , metallurgy , chemistry , thermodynamics , power (physics) , chromatography , physics , quantum mechanics , engineering
Herein, we describe a simple two‐step approach to prepare nickel phosphide with different phases, such as Ni 2 P and Ni 5 P 4 , to explain the influence of material microstructure and electrical conductivity on electrochemical performance. In this approach, we first prepared a Ni–P precursor through a ball milling process, then controlled the synthesis of either Ni 2 P or Ni 5 P 4 by the annealing method. The as‐prepared Ni 2 P and Ni 5 P 4 are investigated as supercapacitor electrode materials for potential energy storage applications. The Ni 2 P exhibits a high specific capacitance of 843.25 F g −1 , whereas the specific capacitance of Ni 5 P 4 is 801.5 F g −1 . Ni 2 P possesses better cycle stability and rate capability than Ni 5 P 4 . In addition, the Fe 2 O 3 //Ni 2 P supercapacitor displays a high energy density of 35.5 Wh kg −1 at a power density of 400 W kg −1 and long cycle stability with a specific capacitance retention rate of 96 % after 1000 cycles, whereas the Fe 2 O 3 //Ni 5 P 4 supercapacitor exhibits a high energy density of 29.8 Wh kg −1 at a power density of 400 W kg −1 and a specific capacitance retention rate of 86 % after 1000 cycles.