p型透明导电氧化物/n型半导体异质连接,用于有效和稳定的太阳能水氧化
Le Chen1,2, Jinhui Yang1,2, Shannon Klaus1,2
1†Joint Center for Artificial Photosynthesis, ‡Materials Sciences Division, ¶Chemical Sciences Division, and §Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
Journal of the American Chemical Society
|July 11, 2015
概括
通过保护光电极,p型透明导电氧化物 (p-TCOs) 增强了太阳水的分裂. 这项研究表明,使用NiCo2O4作为p-TCO与或酸光电极的稳定,高效的氧化水.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 可再生能源可再生能源是可再生能源.
背景情况:
- 稳定的光电极对于太阳能水分离是必不可少的.
- p型透明导电氧化物 (p-TCOs) 可以作为保护和导电层.
研究的目的:
- 为了研究使用p-TCOs在太阳能水分裂中实现稳定和高效的光电极运行.
- 为了证明NiCo2O4作为p-TCO的保护性和孔选择性特性.
主要方法:
- 使用NiCo2O4作为p-TCO和n型Si或n型InP作为吸光器制造异质连接光电极.
- 在AM1.5G照明下进行电化学表征.
- 长期稳定性测试 (72小时).
- 在现场使用拉曼光谱来研究材料的转变.
主要成果:
- 一个NiCo2O4 / n-Si异质连接光电极在0.95V与RHE相比,在1.23V与RHE相比,实现了高效的水氧化,电流密度>25mA cm(-2).
- 经过72小时的稳定运行,没有明显的退化.
- 光吸收器和p-TCO之间的接口质量极大地影响性能,SiOx层的形成降低了效率.
- 通过n-InP/p-NiCo2O4异构连接验证了p-TCO方法,显示了多小时稳定的水氧化.
结论:
- p-TCOs,特别是NiCo2O4,有效地作为孔选择性接触物和光电极的腐蚀防护层.
- 开发的NiCo2O4/n-Si光电极显示了太阳能水分裂的高效率和显著的稳定性.
- p-TCO策略广泛适用于InP等不同吸光器,为强大的太阳能燃料发电铺平了道路.
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