Reduced graphene oxide composite Ni3S2 microspheres grown directly on nickel foam as an efficient electrocatalyst for OER
Zhenxin Zhao, Jianming Liao, Ruijie Shi, Xuan Zhao, Zikang Wang, Jiajun Li, Qing Li, Daxiang Yang, Ming Nie, Yuping Liu
Abstract
The development of cheap, high-efficiency, and stable oxygen evolution reaction (OER) electrocatalysts is a current research hotspot. In this work, reduced graphene oxide (rGO) composite Ni 3 S 2 microspheres grown directly on nickel foam (Ni 3 S 2 -rGO/NF) were prepared by tube furnace calcination and hydrothermal method . The Ni 3 S 2 -rGO/NF had excellent OER catalytic activity and stability with an overpotential of 303 mV at the current density of 100 mA cm −2 , which was 100 mV lower than that of Ni 3 S 2 /NF, and its Tafel slope was as low as 23 mV·dec −1 . The main reason for enhancing OER activity of the Ni 3 S 2 -rGO/NF is due to synergistic effect of Ni 3 S 2 microspheres and rGO, which inhibited the production of NiS and refined the micron size of Ni 3 S 2 . This work offers a new method for developing stable and efficient OER catalysts.