Carbon layer coated nickel phosphide nanoparticles embedded in three-dimensional graphene network for high-performance supercapacitor. (June 2022)

• Record Type: Journal Article
• Authors: Jia, Yuhang; Hu, Daping; Wang, Xue; Zhang, Haijuan; Du, Pengcheng
• Is Part Of: Journal of energy storage. Volume 50(2022)
• Publication Date: 2022-06
• Subjects: Ni2P nanoparticle -- Carbon layer coated material -- 3D graphene composite network -- Chemical-blowing method -- Low-temperature phosphorylation; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2022.104713
• Languages: English
• ISSNs: 2352-152X

Abstract

Abstract: Transition metal phosphides (TMPs) are widely used as an electrode material because of their adjustable electronic structure, variable composition, and excellent electrical conductivity, which possess a broad application prospect in supercapacitors (SCs). The participation of carbon material is capable of enhancing the conductivity and electrochemical property of TMPs. Herein, carbon layer coated Ni2 P nanoparticles embedded in a three-dimensional graphene network (Ni2 P@C@rGO) are elaborately designed by the chemical-blowing method and subsequently low-temperature phosphorylation. The optimal Ni2 P@C@rGO exhibits excellent capacitance of 1338.8 F/g at 1 A/g with a good rate capability of 66% even up to 30 A/g. For further exploring the practical application value, asymmetric SCs (ASCs) are successfully constructed based on Ni2 P@C@rGO and N-PCS (nitrogen-doped porous carbon sheet) fabricated using a one-step chemical-blowing method. As a result, the ASC shows an excellent energy density of 33.4 Wh/kg at a power density of 792.1 W/kg, and remarkable cycle stability (85.2% capacitance retention after 10, 000 cycles at 10 A/g). Thus, the Ni2 P@C@rGO exhibits very attractive candidate as electrode material in high-performance energy-storage devices. Graphical abstract: Unlabelled Image Highlights: 3D network Ni2 P@C@rGO is constructed through chemical-blowing and phosphorylation reaction. It possesses a remarkable capacitance of 1338.8 F/g at 1 A/g with a good rate capability. ASCs exhibit excellent energy density of 33.4 Wh/kg at a power density of 792.1 W/kg. ASCs reveal remarkable cycle stability and the capacitance keeps 85.2% after 10, 000 cycles at 10 A/g.