Ionic Liquid-Assisted Synthesis of Hierarchical One-Dimensional MoP/NPC for High-Performance Supercapacitor and Electrocatalysis
Anning Jiang, Zegao Wang, Qiang Li, Mingdong Dong
Abstract
The development of advanced nanomaterials with multifunctionalities is an intriguing and challenging approach for utilizing clean and sustainable energy. Herein, we demonstrate the construction of a unique hierarchically structured one-dimensional molybdenum phosphide (MoP) through an ionic liquid-assisted synthesis method. Further, encapsulating with an N, P-codoped carbon shell to form a hybrid multifunctional material (MoP/NPC) was performed for the supercapacitor and electrocatalysis. The as-synthesized MoP/NPC nanostructures possessed a large number of active sites and a shorter ionic diffusion length. As a proof-of-concept application, the symmetric all-solid-state supercapacitor device assembled using MoP/NPC delivers a superior-specific capacitance of 544 F g–1 at 0.5 A g–1, a high specific energy of 76 W h kg–1 at a power density of 503 W kg–1, and outstanding cycling stability. Moreover, MoP/NPC also displays excellent electrocatalytic activity and stability toward hydrogen evolution reaction in a wide pH range (0–14). This study demonstrates an effective strategy for developing transition-metal phosphide-based nanomaterials with outstanding electrochemical performance for future energy conversion and storage.