Photoelectrochemical cell composed of solution-processed nanoflower heterostructure of Au core and eight CdSe petals was investigated for enhanced photocurrent generation. The electrode of CdSe nanorods displayed photocurrent density of 2.1 mA/cm2 whereas the Au core CdSe nanoflower exhibited 4.6 mA/cm2 corresponding to a 119% increase during photoelectrochemical cell performance. Both electrodes showed prompt response to the on/off cycles of light, the photocurrent gain (IPhoton/Idark) in CdSe nanorods is 124.7, while the value is 223.3 for Au/CdSe nanoflower, calculated from the growth-decay curves. Photoresponse time was dramatically improved for Au/CdSe nanoflower samples due to increasing in 66% incident photon-to-current emission. Electron lifetime of 21.63 and 48.71 ns was observed for the electrode of CdSe nanorods and Au/CdSe nanoflowers respectively. The prolonged electron lifetime in the case of the electrode of Au/CdSe nanoflowers was responsible for improving charge separation and as a consequence, higher photocurrent generation.

中文翻译：

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Au/CdSe 杂化纳米花：产生高光电流的光电化学电池

研究了由溶液处理的 Au 核纳米花异质结构和八个 CdSe 花瓣组成的光电化学电池，以增强光电流的产生。CdSe 纳米棒电极的光电流密度为 2.1 mA/cm2，而 Au 核心 CdSe 纳米花的光电流密度为 4.6 mA/cm2，对应于光电化学电池性能的 119% 增加。两个电极都对光的开/关循环显示出快速响应，CdSe 纳米棒的光电流增益 (IPhoton/Idark) 为 124.7，而 Au/CdSe 纳米花的值为 223.3，根据生长衰减曲线计算。由于 66% 的入射光子到电流发射增加，Au/CdSe 纳米花样品的光响应时间显着改善。电子寿命为 21.63 和 48。分别观察到 CdSe 纳米棒和 Au/CdSe 纳米花的电极为 71 ns。在 Au/CdSe 纳米花电极的情况下，电子寿命延长有助于改善电荷分离，从而产生更高的光电流。