纳米棒
光电流
光催化
光电阴极
水溶液
可见光谱
材料科学
分解水
量子产额
光化学
抗坏血酸
催化作用
纳米技术
光电子学
化学
光学
电子
物理化学
物理
荧光
量子力学
生物化学
食品科学
作者
Moritz F. Kuehnel,Charles E. Creissen,Constantin D. Sahm,Dominik Wielend,Anja Schlosser,Katherine L. Orchard,Erwin Reisner
标识
DOI:10.1002/anie.201814265
摘要
Abstract A precious‐metal‐ and Cd‐free photocatalyst system for efficient H 2 evolution from aqueous protons with a performance comparable to Cd‐based quantum dots is presented. Rod‐shaped ZnSe nanocrystals (nanorods, NRs) with a Ni(BF 4 ) 2 co‐catalyst suspended in aqueous ascorbic acid evolve H 2 with an activity up to 54±2 mmol g ZnSe −1 h −1 and a quantum yield of 50±4 % ( λ =400 nm) under visible light illumination (AM 1.5G, 100 mW cm −2 , λ >400 nm). Under simulated full‐spectrum solar irradiation (AM 1.5G, 100 mW cm −2 ), up to 149±22 mmol g ZnSe −1 h −1 is generated. Significant photocorrosion was not noticeable within 40 h and activity was even observed without an added co‐catalyst. The ZnSe NRs can also be used to construct an inexpensive delafossite CuCrO 2 photocathode, which does not rely on a sacrificial electron donor. Immobilized ZnSe NRs on CuCrO 2 generate photocurrents of around −10 μA cm −2 in an aqueous electrolyte solution (pH 5.5) with a photocurrent onset potential of approximately +0.75 V vs. RHE. This work establishes ZnSe as a state‐of‐the‐art light absorber for photocatalytic and photoelectrochemical H 2 generation.
科研通智能强力驱动
Strongly Powered by AbleSci AI