•  
  •  
 
Nano Research

Article Title

N-doped-carbon coated Ni2P-Ni sheets anchored on graphene with superior energy storage behavior

Authors

Yuanxing Zhang, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, No. 29, Xueyuan road, Haidian district, Beijing 100083, China
Li Sun, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, No. 29, Xueyuan road, Haidian district, Beijing 100083, China
Liqi Bai, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, No. 29, Xueyuan road, Haidian district, Beijing 100083, China
Haochen Si, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, No. 29, Xueyuan road, Haidian district, Beijing 100083, China
Yu Zhang, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, No. 29, Xueyuan road, Haidian district, Beijing 100083, China
Yihe Zhang, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, No. 29, Xueyuan road, Haidian district, Beijing 100083, China

Keywords

nickel phosphide, graphene, nitrogen-doped carbon, asymmetric supercapacitors, lithium ion batteries

Abstract

Transition metal phosphides (TMPs) have been widely studied as electrode materials for supercapacitors and lithium-ion batteries due to their high electrochemical reaction activities. The practical application of TMPs was generally hampered by their low conductivity and large volume changes during electrochemical reactions. In this work, nitrogen-doped-carbon (NC) coated Ni2P-Ni hybrid sheets were fabricated and loaded into highly conductive graphene network, forming a Ni2P-Ni@NC@G composite. The highly conductive graphene, the NC coating layer, and the decorated Ni nanoparticles in combination offer continuous electron transport channels in the composite, resulting with facilitated electrode reaction kinetics and superior rate performance. Besides, the flexible graphene sheets and well-decorated Ni particles among Ni2P can effectively buffer the harmful stress during electrochemical reactions to maintain an integrated electrode structure. With these favorable features, the composite demonstrated superior capacitive and lithium storage behavior. As an electrode material for supercapacitors, the composite shows a remarkable capacitance of 2,335.5 F·g−1 at 1 A·g−1 and high capacitance retention of 86.4% after 2,000 cycles. Asymmetrical supercapacitors (ASCs) were also prepared with remarkable energy density of 53.125 Whk·g−1 and power density of 3,750 Whk·g−1. As an anode for lithium ion batteries, a high reversible capacity of 1,410 mAh·g−1 can be delivered at 0.2 A·g−1 after 200 cycles. Promising high rate capability was also demonstrated with a high discharge capacity of 750 mAh·g−1 at 8 A·g−1. This work shall pave the way for the production of other TMP materials for energy storage systems.

Graphical Abstract

Publisher

Tsinghua University Press

Share

COinS