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Improved Long-term Stability of Dye-Sensitized Solar Cell by Zeolite Additive in Electrolyte
Sarwar, Saad,Ko, Kwan-Woo,Han, Jisu,Han, Chi-Hwan,Jun, Yongseok,Hong, Sungjun Elsevier 2017 ELECTROCHIMICA ACTA Vol.245 No.-
<P><B>Abstract</B></P> <P>In this study, we demonstrate dye-sensitized solar cells showing an improved long-term stability at a high temperature by incorporating Zeolite molecular sieve in ionic liquid based electrolytes. The short-circuit photocurrent density of devices with 5wt% of Zeolite molecular sieve increases by 17% on average relative to that of device without any additive, mainly owing to its light scattering effect. Moreover, the devices containing Zeolite molecular sieve show remarkable enhancement of the thermal stability at 60°C for a period of 1200hours under dark condition with a marginal variation of performance. On the contrary, the performance of devices without additives is continuously deteriorated during this period because of adverse effects of trace waters present in electrolytes, which can lead to dye molecules' detachment or degradation. This research study will pave a new way to fabricate thermally stable dye-sensitized solar cells with high efficiency.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Novel Nano-ZSM based electrolyte is prepared for DSSCs. </LI> <LI> Nano-ZSM additive acts as both incident light scatter and moisture scavenger. </LI> <LI> Nano-ZSM additive improves long-term thermal stability of DSSCs. </LI> </UL> </P>
Saad Sarwar,Minsun Kim,Giljae Baek,오일환,이호춘 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.7
Si–air battery (SAB) comprising of Si nanowire (SiNW) anode and alkaline solution and showing a working voltage of ca. 1.2V is investigated to elucidate the origin of superior discharge performance of the nanostructured Si anode to that of a planar Si anode. The SiNWs are found to transform into Si nanopyramids (SiNPs) upon immersion in the alkaline solution or when subjected to SAB discharge. In this regard, the improved performance of the SiNW anode is attributed to the formation of SiNPs with (111) facets that are intrinsically resistant to passivation. In addition, the nanostructured Si anode also shows a lower threshold temperature for the surface passivation than the planar Si anode, a merit that leads to a sustained discharge even at room temperature.