Hybrid structured CoNi2S4/Ni3S2 nanowires with multifunctional performance for hybrid capacitor electrodes and overall water splitting

Xiaoyun Liu; Qian Li; Xin Zhang; Yueqiu Jiang

doi:10.1039/d0ra05544a

Hybrid structured CoNi₂S₄/Ni₃S₂ nanowires with multifunctional performance for hybrid capacitor electrodes and overall water splitting

RSC Adv. 2020 Sep 10;10(55):33428-33435. doi: 10.1039/d0ra05544a. eCollection 2020 Sep 7.

Authors

Xiaoyun Liu¹, Qian Li¹, Xin Zhang², Yueqiu Jiang³

Affiliations

¹ School of Science, Shenyang Ligong University Shenyang 110159 P. R. China liuxy@imr.ac.cn.
² School of Automobile and Transportation, Shenyang Ligong University Shenyang 110159 P. R. China.
³ Department of Development and Planning, Shenyang Ligong University Shenyang 110159 P. R. China yueqiujiang@sylu.edu.cn.

Abstract

Rational design of electrode materials plays a significant role in potential applications such as energy storage and conversion. In this work, CoNi₂S₄/Ni₃S₂ nanowires grown on Ni foam were synthesized through a facile hydrothermal approach, revealing a large capacitance of 997.2 F g^-1 and cycling stability with 80.3% capacitance retention after 5000 cycles. The device was prepared using CoNi₂S₄/Ni₃S₂//AC as the positive electrode and active carbon as the negative electrode, and delivered an energy density of 0.4 mW h cm^-3 at a power density of 3.99 mW cm^-3 and an excellent cycle life with 79.2% capacitance retention after 10 000 cycles. In addition, the hybrid CoNi₂S₄/Ni₃S₂ nanowires demonstrate excellent OER performance with low overpotential of 360 mV at 30 mA cm^-2 and overpotential of 173.8 mV at -10 mA cm^-2 for the HER, a cell voltage of 1.43 V, and excellent cycle stability.