NiCoP Nanoarray: A Superior Pseudocapacitor Electrode with High Areal Capacitance. Issue 18 (15th March 2017)

• Record Type: Journal Article
• Authors: Kong, Menglai; Wang, Zao; Wang, Weiyi; Ma, Min; Liu, Danni; Hao, Shuai; Kong, Rongmei; Du, Gu; Asiri, Abdullah M.; Yao, Yadong; Sun, Xuping
• Is Part Of: Chemistry. Volume 23:Issue 18(2017)
• Page Start: 4435
• Page End: 4441
• Publication Date: 2017-03-15
• Subjects: electrochemistry -- high areal capacitance -- multifunctional -- NiCoP nanoarray -- supercapacitors; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201700017
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: 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. Abstract : NiCoP nanoarray on nickel foam behaves as a superior 3D pseudocapacitor electrode, delivering a high areal capacitance of 9.2 F cm −2 at a current density of 2 mA cm −2 with good rate capability and cycling stability. Its combination with AC leads to an asymmetric supercapacitor with an energy density of 1.16 mWh cm −2 at a power density of 1.6 mW cm −2 . This device can light six LED bulbs and split water to hydrogen and oxygen using a NiCoP nanoarray‐based two‐electrode alkaline water electrolyzer.