材料科学
制氢
量子点
生产(经济)
光电子学
分解水
氢
光电化学
光电化学电池
纳米技术
工程物理
化学工程
光催化
电化学
催化作用
电极
量子力学
物理
经济
宏观经济学
化学
工程类
电解质
生物化学
作者
Kanghong Wang,Chao Wang,Tao Yi,Zikun Tang,Daniele Benetti,François Vidal,Yu Liu,Mark H. Rümmeli,Haiguang Zhao,Federico Rosei,Xuhui Sun
标识
DOI:10.1002/adfm.202400580
摘要
Abstract Solar‐driven photoelectrochemical (PEC) reactions using colloidal quantum dots (QDs) as photoabsorbers have shown great potential for the production of clean fuels. However, the low H2 evolution rate, consistent with low values of photocurrent density, and their limited operational stability are still the main obstacles. To address these challenges, the heterostructure engineering of asymmetric capsule‐shaped CdSe/CdxZn1‐xSe QDs with broad absorption and efficient charge extraction compared to pure‐shell QDs is reported. By engineering the shell composition from pure ZnSe shells into CdxZn1‐xSe gradient shells, the electron transfer rate increased from 4.0 × 107 s −1 to 32.7 × 107 s −1 . Moreover, the capsule‐shaped architecture enables more efficient spatial carrier separation, yielding a saturated current density of average of 25.4 mA cm −2 under AM 1.5 G one sun illumination. This value is the highest ever observed for QDs‐based devices and comparable to the best‐known Si‐based devices, perovskite‐based devices, and metal oxide‐based devices. Furthermore, PEC devices based on heterostructured QDs maintained 96% of the initial current density after 2 h and 82% after 10 h under continuous illumination, respectively. The results represent a breakthrough in hydrogen production using heterostructured asymmetric QDs.
科研通智能强力驱动
Strongly Powered by AbleSci AI