Sheet-membrane Mn-doped nickel hydroxide encapsulated via heterogeneous Ni3S2 nanoparticles for efficient alkaline battery–supercapacitor hybrid devices. Issue 39 (26th September 2018)

• Record Type: Journal Article
• Authors: Ye, Lin; Zhou, Yitong; Bao, Zepei; Zhao, Yuguang; Zou, Yining; Zhao, Lijun; Jiang, Qing
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 39(2018)
• Page Start: 19020
• Page End: 19029
• Publication Date: 2018-09-26
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8ta04613a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : An Mn-doped Ni(OH)2 /Ni3 S2 hybrid structure exhibits efficient energy storage due to its distinctive structural and component advantages. Abstract : Efficient, robust and safe energy storage systems occupy a vital position in the development of the electronics industry; they rely strongly on the rational design of electrode materials. In this manuscript, a one-pot hydrothermal route was employed to prepare sheet-membrane Mn-doped nickel hydroxide encapsulated via heterogeneous Ni3 S2 nanoparticles. The inner large nanosheets, outer ultrathin membranes and encapsulated Ni3 S2 nanoparticles construct a mechanically robust three-dimensional structure which provides abundant active sites to participate in electrochemical reactions. Density functional theory (DFT) calculations further reveal that the introduction of Ni3 S2 and Mn-doping in nickel hydroxide obviously decrease the deprotonation energy and shorten the energy gap of Ni(OH)2, which greatly favors the electrochemical performance of the electrode material. When directly employed in a three-electrode alkaline supercapacitive electrode, NiMn-1 displays excellent capacitance of 385.6 mA h g −1 at 0.68 A g −1, enhanced rate performance (reaching 56.7% retention at 34 A g −1 ) and outstanding cycling stability (retaining 95.6% after 3000 cycles). Furthermore, a battery–supercapacitor hybrid device was developed based on this electrode material. The device also exhibits excellent capacitance of 59.7 mA h g −1 (at 0.47 A g −1 ), a high energy density of 51.5 W h kg −1 (at 404 W kg −1 ) and a suitable service lifespan. Therefore, this high-capacitance electrochemical performance endows the device with further advantages in the energy storage field.