光电阴极
解耦(概率)
光电流
硅
材料科学
光电子学
催化作用
吸收(声学)
光学
不透明度
化学
物理
复合材料
工程类
控制工程
电子
量子力学
生物化学
作者
Wouter Vijselaar,Pieter Westerik,Janneke Veerbeek,Roald M. Tiggelaar,J.W. Berenschot,Niels Roelof Tas,Han Gardeniers,Jurriaan Huskens
出处
期刊:Nature Energy
[Springer Nature]
日期:2018-01-15
卷期号:3 (3): 185-192
被引量:119
标识
DOI:10.1038/s41560-017-0068-x
摘要
A solar-driven photoelectrochemical cell provides a promising approach to enable the large-scale conversion and storage of solar energy, but requires the use of Earth-abundant materials. Earth-abundant catalysts for the hydrogen evolution reaction, for example nickel–molybdenum (Ni–Mo), are generally opaque and require high mass loading to obtain high catalytic activity, which in turn leads to parasitic light absorption for the underlying photoabsorber (for example silicon), thus limiting production of hydrogen. Here, we show the fabrication of a highly efficient photocathode by spatially and functionally decoupling light absorption and catalytic activity. Varying the fraction of catalyst coverage over the microwires, and the pitch between the microwires, makes it possible to deconvolute the contributions of catalytic activity and light absorption to the overall device performance. This approach provided a silicon microwire photocathode that exhibited a near-ideal short-circuit photocurrent density of 35.5 mA cm−2, a photovoltage of 495 mV and a fill factor of 62% under AM 1.5G illumination, resulting in an ideal regenerative cell efficiency of 10.8%. Catalysts are required to increase the rate of H2 evolution over silicon photocathodes, but their presence can lead to parasitic light absorption. Here, the authors explore the contributions of catalysts and light absorption to the overall performance of Si microwires, depositing Ni–Mo catalysts spatioselectively to optimize efficiency.
科研通智能强力驱动
Strongly Powered by AbleSci AI