Incorporating Hierarchical Nanostructured Carbon Counter Electrode into Metal-Free Organic Dye-Sensitized Solar Cell

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• 作者：Baizeng Fang ; Sheng-Qiang Fan ; Jung Ho Kim ; Min-Sik Kim ; Minwoo Kim ; Nitin K. Chaudhari ; Jaejung Ko ; Jong-Sung Yu
• 刊名：Langmuir
• 出版年：2010
• 出版时间：July 6, 2010
• 年：2010
• 卷：26
• 期：13
• 页码：11238-11243
• 全文大小：874K
• 年卷期：v.26,no.13(July 6, 2010)
• ISSN：1520-5827

文摘

Hierarchical nanostructured carbon with a hollow macroporous core of ca. 60 nm in diameter in combination with mesoporous shell of ca. 30 nm in thickness has been explored as counter electrode in metal-free organic dye-sensitized solar cell. Compared with other porous carbon counterparts such as activated carbon and ordered mesoporous carbon CMK-3 and Pt counter electrode, the superior structural characteristics including large specific surface area and mesoporous volume and particularly the unique hierarchical core/shell nanostructure along with 3D large interconnected interstitial volume guarantee fast mass transport in hollow macroporous core/mesoporous shell carbon (HCMSC), and enable HCMSC to have highly enhanced catalytic activity toward the reduction of I₃⁻, and accordingly considerably improved photovoltaic performance. HCMSC exhibits a V_oc of 0.74 V, which is 20 mV higher than that (i.e., 0.72 V) of Pt. In addition, it also demonstrates a fill factor of 0.67 and an energy conversion efficiency of 7.56%, which are markedly higher than those of its carbon counterparts and comparable to that of Pt (i.e., fill factor of 0.70 and conversion efficiency of 7.79%). Furthermore, HCMSC possesses excellent chemical stability in the liquid electrolyte containing I⁻/I₃⁻ redox couples, namely, after 60 days of aging, ca. 87% of its initial efficiency is still achieved by the solar cell based on HCMSC counter electrode.