Monolithic Photoelectrochemical Device for Direct Water Splitting with 19% Efficiency,ACS Energy Letters

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Monolithic Photoelectrochemical Device for Direct Water Splitting with 19% Efficiency
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-06-25 00:00:00 , DOI: 10.1021/acsenergylett.8b00920
Wen-Hui Cheng _{1,

2} , Matthias H. Richter _{2,

3} , Matthias M. May _{4,

5,

6} , Jens Ohlmann ₇ , David Lackner ₇ , Frank Dimroth ₇ , Thomas Hannappel ₆ , Harry A. Atwater _{1,

2} , Hans-Joachim Lewerenz _{2,

8}

Affiliation

Efficient unassisted solar water splitting, a pathway to storable renewable energy in the form of chemical bonds, requires optimization of a photoelectrochemical device based on photovoltaic tandem heterojunctions. We report a monolithic photocathode device architecture that exhibits significantly reduced surface reflectivity, minimizing parasitic light absorption and reflection losses. A tailored multifunctional crystalline titania interphase layer acts as a corrosion protection layer, with favorable band alignment between the semiconductor conduction band and the energy level for water reduction, facilitating electron transport at the cathode–electrolyte interface. It also provides a favorable substrate for adhesion of high-activity Rh catalyst nanoparticles. Under simulated AM 1.5G irradiation, solar-to-hydrogen efficiencies of 19.3 and 18.5% are obtained in acidic and neutral electrolytes, respectively. The system reaches a value of 0.85 of the theoretical limit for photoelectrochemical water splitting for the energy gap combination employed in the tandem-junction photoelectrode structure.

中文翻译：

用于直接水分解的单片光电电化学装置，效率为19％

有效的无辅助太阳能水分解（一种以化学键的形式获取可储存的可再生能源的途径）需要优化基于光伏串联异质结的光电化学装置。我们报告了一种单片式光电阴极器件架构，该架构展现出显着降低的表面反射率，从而最大限度地减少了寄生光的吸收和反射损耗。量身定制的多功能结晶二氧化钛中间层起腐蚀保护层的作用，在半导体导带和能级之间具有良好的能带对准，可降低水分，从而促进电子在阴极-电解质界面处的传输。它还为高活性Rh催化剂纳米颗粒的粘附提供了良好的基质。在模拟的AM 1.5G辐射下，太阳到氢的效率分别为19.3和18。在酸性和中性电解液中分别获得5％。对于串联结光电极结构中使用的能隙组合，该系统达到光化学水分解的理论极限的0.85的值。

更新日期：2018-06-25

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