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首页> 外文期刊>Nano letters >An Optically and Electrochemically Decoupled Monolithic Photoelectrochemical Cell for High-Performance Solar-Driven Water Splitting
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An Optically and Electrochemically Decoupled Monolithic Photoelectrochemical Cell for High-Performance Solar-Driven Water Splitting

机译：用于高性能太阳能驱动的水分裂的光学和电化学去耦整体光电化学电池

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摘要

Photoelectrochemical (PEC) cells have attracted much attention as a viable route for storing solar energy and producing value-added chemicals and fuels. However, the competition between light absorption and electrocatalysis at a restrained cocatalyst area on conventional planar-type photo electrodes could limit their conversion efficiency. Here, we demonstrate a new monolithic photoelectrode architecture that eliminate the optical-electrochemical coupling by forming locally nanostructured cocatalysts on a photoelectrode. As a model study, Ni inverse opal (IO), an ordered three-dimensional porous nanostructure, was used as a surface-area-controlled electrocatalyst locally formed on Si photoanodes. The optical-electrochemical decoupling of our monolithic photoanodes significantly enhances the PEC performance for the oxygen evolution reaction (OER) by increasing light absorption and by providing more electrochemically active sites. Our Si photoanode with local Ni IOs maintains an identical photolimiting current density but reduces the overpotential by about 120 mV compared to a Si photoanode with planar Ni cocatalysts with the same footprint under 1 sun illumination. Finally, a highly efficient Si photoanode with an onset potential of 0.94 V vs reversible hydrogen electrode (RHE) and a photocurrent density of 31.2 mA/cm(2) at 1.23 V vs RHE in 1 M KOH under 1 sun illumination is achieved with local NiFe alloy IOs.
机译：光电化学（PEC）细胞吸引了许多关注，作为储存太阳能的可行途径，生产增值化学品和燃料。然而，在常规平面光电极的受限制的助催化剂区域的光吸收和电常分之间的竞争可能限制其转化效率。这里，我们展示了一种新的单片光电极架构，其通过在光电极上形成局部纳米结构的助催化剂来消除光学电化学偶联。作为模型研究，Ni反蛋白石（IO）是一种有序的三维多孔纳米结构，用作在Si光阳极上局部形成的表面积控制的电催化剂。通过增加光吸收和提供更多电化学活性位点，我们整体光阳极的光学电化学去耦显着增强了氧气进化反应（OER）的PEC性能。我们的Si PhotoNode带有本地Ni iOS的相同的光致光电流密度，但与带有平面Ni Cocatalysts的Si PhotoPanode相比，与具有相同占地面积的Si PhotoPlalys的Si PhotoNode，减少了大约120 mV。最后，在1M KOH的1M KOH下，在1米KOH下，在1MKOH下，在1M KOH中，局部达到一个高效的Si光电极和31.2mA / cm（2）的光电流密度为31.2mA / cm（2）的光电流密度nife合金ios。

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