A multi-hierarchical 3D conductive construction of a MoP/C-rGO hybrid for a HER catalyst and a LIB anode

Abstract

Constructing molybdenum phosphides (MoP) that are connected to conductive composite materials has been demonstrated to be an effective strategy for improving the activity of MoP, and it is crucial for...

Nest-Like Molybdenum Diphosphide-Carbon Nanotube Nanocomposite for Lithium-Ion Storage

“…At 1.0 and 4.0 A g –1 , after 500 cycles, the MoP 2 –CNT electrode still delivered the discharge capacities of 504.7 and 310.6 mA h g –1 with the capacity retention of 87.4% and 93.2%, demonstrating high long-term cycling stability and rate capability of the MoP 2 –CNT electrode. Compared with previously reported molybdenum-phosphide-based anodes for LIBs (Figure S12 and Table S1), ,,− ,− MoP 2 –CNT anode showed the competitive rate capability and long-term cycling performance. The surface morphologies of MoP 2 –CNT and MoP 2 /CNT mixture electrodes were characterized by SEM before and after cycling to assess their stability (Figure S13).…”

“…To satisfy the ever-growing demand for high-energy-density lithium-ion batteries (LIBs), new-generation anode materials with high capacity and long-term stability have been extensively explored. − In recent years, phosphorus-based materials, including metal phosphides (MPs) and elemental phosphorus with high theoretical specific capacity (500–1900 mA h g –1 for MPs and 2596 mA h g –1 for phosphorus) have been widely concerned. − ,− The highly delocalized electron and mixed anionic metal band in MPs induce a low oxidation state of metal and strong metal–phosphorus (M–P) covalent bonds. − MPs have better electrical conductivity (10 –12 –10 2 S m –1 for phosphorus and 10 –3 ∼ 10 6 S m –1 for MPs) and higher structural stability than elemental phosphorus, so the MP-based materials are promising anode materials for LIBs. ,,− Moreover, the formation of metallic nanocrystals within phosphorus matrices during charging/discharging cycles also provides additional electron transport pathways, which are required for high-rate anode. ,, Molybdenum phosphides (i.e., monophosphorus phase MoP and phosphorus-rich phase MoP 2 ) as low-cost catalysts for hydrogen evolution reaction and anode materials have been extensively explored. ,,− Molybdenum is an important element with a redox chemistry and better conductivity. The lithium-ion storage capacity of metal phosphides is proportional to the phosphorus content; ,,− thus, MoP 2 is a more attractive material for LIBs .…”