Photoelectrochemistry of Stacked-Cup Carbon Nanotube Films. Tube-Length Dependence and Charge Transfer with Excited Porphyrin
Photoelectrochemistry of Stacked-Cup Carbon Nanotube Films. Tube-Length Dependence and Charge Transfer with Excited Porphyrin
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DOI：
10.1021/jp074995k
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发表时间：
2007-10
影响因子：
3.7
通讯作者：
Taku Hasobe;H. Murata;P. Kamat
中科院分区：
文献类型：
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作者：
Taku Hasobe;H. Murata;P. Kamat
光电化学太阳能电池是在光学透明电极（OTE）上堆叠杯状碳纳米管（SCCNT）。三个不同的管长度的SCCNT样品（长型，L-SCCNT;中型，M-SCCNT;和短型，S-SCCNT）的电化学沉积在OTE/SnO 2电极探测管长度依赖的光电化学行为。OTE/SnO 2/L-SCCNT在0.2 V vs SCE的偏压下获得最大的入射光-光电流效率（IPCE）为19%。SCCNT修饰电极的功率转换效率（η）随着管长的增加而增加。OTE/SnO 2/L-SCCNT电极的最大功率转换效率（η）为0.11%，是OTE/SnO 2/S-SCCNT电极的最大功率转换效率（η）（0.018%）的6倍。在乙腈/甲苯（5/1，v/v）中制备了由S-SCCNT和5，15-双（3，5-二叔丁基苯基）卟啉（H2 P）组成的分子组装体，并将其沉积在纳米结构的基底上。
Photoelectrochemical solar cells are constructed with stacked-cup carbon nanotubes (SCCNT) on optically transparent electrodes (OTE). Three SCCNT samples with different tube lengths (long type, L-SCCNT; medium type, M-SCCNT; and short type, S-SCCNT) were electrophoretically deposited on OTE/SnO2 electrodes to probe the tube-length dependence of the photoelectrochemical behavior. The maximum incident photon-to-photocurrent efficiency (IPCE) of 19% is attained at an applied bias potential of 0.2 V vs SCE in OTE/SnO2/L-SCCNT. The power conversion efficiencies (η) of SCCNT-modified electrodes increase with increasing tube length. The maximum power conversion efficiency (η) of OTE/SnO2/L-SCCNT electrode is determined to be 0.11%, which is about 6 times greater than that of the OTE/SnO2/S-SCCNT electrode (0.018%). Molecular assemblies composed of S-SCCNT and 5,15-bis(3,5-di-tert-butylphenyl)porphyrin (H2P) prepared in acetonitrile/toluene (5/1, v/v) were deposited as three-dimensional arrays onto nanostructured...