论文标题
通过au/feOOH夹心单晶Fe $ _2 $ o $ $ _3 $ nanoflake Photelectrodes中的Swift Charge Eapination增强的太阳能水分分开
Enhanced Solar Water Splitting by Swift Charge Separation in Au/FeOOH Sandwiched Single Crystalline Fe$_2$O$_3$ Nanoflake Photoelectrodes
论文作者
论文摘要
在这项工作中，单晶$α$ -fe $ _2 $ o $ _3 $ nanoflakes（NFS）是通过热氧化技术的Fe底物的高度致密阵列形成的。 NFs用薄薄的feOOH cocatalyst层进行完整的装饰。光电化学（PEC）测量表明，与源于AU/FE结构上的$α$ -FE $ -FE $ _2 $ _2 $ $ _3 $/feOOH NFS相比，PEC水氧化性能显着增强，与普通的$α$ -FE $ -FE $ _2 $ _2 $ _2 $ _3 $ _3 $ _3 $ _3 $ _3 $ _3 $ _3 $ _3 $ nanostrate相比。 The $α$-Fe$_2$O$_3$/FeOOH NFs on Au/Fe photoanode yields a photocurrent density of 3.1 mA cm-2 at 1.5 VRHE, and a remarkably low onset potential of 0.5-0.6 VRHE in 1 M KOH under AM 1.5G (100 mW cm-2) simulated sunlight illumination. PEC性能的增强可以归因于FeOOH顶部装饰和AU下层的协同作用。尽管FeOOH促进电极/电解质界面处的孔传输，但AU层为电向回接到的电子传输提供了一个水槽：这总体上导致了单个结晶$α$α$ -FE $ -FE $ _2 $ _2 $ _2 $ _3 $ _3 $ nf nf photoanode的电荷分离效率。
In this work, single crystalline $α$-Fe$_2$O$_3$ nanoflakes (NFs) are formed in a highly dense array by Au seeding of a Fe substrate by a thermal oxidation technique. The NFs are conformally decorated with a thin FeOOH cocatalyst layer. Photoelectrochemical (PEC) measurements show that this photoanode with the $α$-Fe$_2$O$_3$/FeOOH NFs rooted on the Au/Fe structure exhibits a significantly enhanced PEC water oxidation performance compared to the plain $α$-Fe$_2$O$_3$ nanostructure on the Fe substrate. The $α$-Fe$_2$O$_3$/FeOOH NFs on Au/Fe photoanode yields a photocurrent density of 3.1 mA cm-2 at 1.5 VRHE, and a remarkably low onset potential of 0.5-0.6 VRHE in 1 M KOH under AM 1.5G (100 mW cm-2) simulated sunlight illumination. The enhancement in PEC performance can be attributed to a synergistic effect of the FeOOH top decoration and Au under-layer. While FeOOH facilitates hole transfer at the interface of electrode/electrolyte, the Au layer provides a sink for the electron transport to the back contact: this leads overall to a drastically improved charge-separation efficiency in the single crystalline $α$-Fe$_2$O$_3$ NF photoanode.
