Template synthesis of core-shell WS2 @N/C nanocage Multifunctional Electrocatalysts for Dye sensitized solar cellsAuthor(s): Xiaohui Liu, Yanfang Gao*
Dye-sensitized solar solar and efficient oxygen reduction play an indispensable role in various energy conversion devices due to its acceptable energy conversion efficiency, low-cost and simple production.The counter electrode (CE) plays a crucial role collects electrons from the external circuit and reduces the tri-iodide to iodide species by converting tri-iodide generated at the anode back to iodide, which has a significant influence on the photovoltaic performance.  platinum (Pt) is normally used as the CE for reducing the I3− redox species,and cobalt(II/III) electrolyte and zinc porphyrin dye achieved a highest power conversion efficiency of 12%.However,Pt is an expensive and scarce material. Therefore, it is highly desired to seek for sustainable alternative materials for platinum group metals.
2D transition metal dichalcogenides (TMDs) analogous structure like graphite,it structure is composed of three atomic layers, a W layer sandwiched between two S layers, and the triple layers are stacked by weak van der Waals interaction.Wu et al,used commercial WS2 as a CE material for DSSCs. They demonstrated that WS2 was a good candidate to replace a Pt CE in DSSCs.WS2 is undoubtedly a hopeful material for catalyzing the reduction of I3-.
Metal-organic framework (MOF) synthesized by the assembly of metal nodes and organic linkers, have emerged as promising materials for diverse applications due to their high porosity and ultrahigh surface area.Calcinate the MOF material at high temperature,get the N-doped hollow carbon nanocages.TMDs combined with MOF templating synthesis of few-layered WS2 Nanoplates confined in Metal-organic framework Nanocaqes for dye-sensitized solar cells as the counter electrode.