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NiCoP Nanoarray: A Superior Pseudocapacitor Electrode with High Areal Capacitance
Author(s) -
Kong Menglai,
Wang Zao,
Wang Weiyi,
Ma Min,
Liu Danni,
Hao Shuai,
Kong Rongmei,
Du Gu,
Asiri Abdullah M.,
Yao Yadong,
Sun Xuping
Publication year - 2017
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.201700017
Subject(s) - pseudocapacitor , supercapacitor , materials science , electrode , capacitance , anode , electrolyte , power density , cathode , optoelectronics , current density , nanotechnology , chemistry , power (physics) , physics , quantum mechanics
High‐performance supercapacitors require the design and development of electrode materials with high conductivity and a large electrolyte‐accessible surface area. Here, the use of a conductive NiCoP nanoarray on nickel foam (NiCoP/NF) as a superior pseudocapacitor electrode is demonstrated. This 3D electrode exhibits high areal capacitances of 9.2 and 5.97 F cm −2 at current densities of 2 and 50 mA cm −2 , respectively, with good rate capability and cycling stability. The asymmetric supercapacitor (ASC) device assembled using NiCoP/NF as positive electrode and active carbon as negative electrode delivers a high energy density of 1.16 mWh cm −2 at a power density of 1.6 mW cm −2 with 72 % retention of its initial specific capacitance after 2000 cycles at 50 mA cm −2 . The practical use is further demonstrated with two such ASC devices in series to light six LED indicators and also to drive an alkaline water electro‐ lyzer using NiCoP/NF as both cathode and anode for hydrogen production.