水分解。无金属高效光催化剂，通过两电子途径实现稳定可见光分解水。

Water splitting. Metal-free efficient photocatalyst for stable visible water splitting via a two-electron pathway.

机构信息

Jiangsu Key Laboratory for Carbon-based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou 215123, China.

Jiangsu Key Laboratory for Carbon-based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou 215123, China. Department of Materials Science and Engineering, Technion, Israel Institute of Technology, Haifa 3200003, Israel.

出版信息

Science. 2015 Feb 27;347(6225):970-4. doi: 10.1126/science.aaa3145.

DOI:10.1126/science.aaa3145

PMID:25722405

Abstract

The use of solar energy to produce molecular hydrogen and oxygen (H2 and O2) from overall water splitting is a promising means of renewable energy storage. In the past 40 years, various inorganic and organic systems have been developed as photocatalysts for water splitting driven by visible light. These photocatalysts, however, still suffer from low quantum efficiency and/or poor stability. We report the design and fabrication of a metal-free carbon nanodot-carbon nitride (C3N4) nanocomposite and demonstrate its impressive performance for photocatalytic solar water splitting. We measured quantum efficiencies of 16% for wavelength λ = 420 ± 20 nanometers, 6.29% for λ = 580 ± 15 nanometers, and 4.42% for λ = 600 ± 10 nanometers, and determined an overall solar energy conversion efficiency of 2.0%. The catalyst comprises low-cost, Earth-abundant, environmentally friendly materials and shows excellent stability.

摘要

利用太阳能将水分解为氢气和氧气（H2 和 O2）是一种很有前途的可再生能源储存方式。在过去的 40 年中，已经开发出了各种无机和有机系统作为可见光驱动水分解的光催化剂。然而，这些光催化剂仍然存在量子效率低和/或稳定性差的问题。我们报告了一种无金属碳纳米点-氮化碳（C3N4）纳米复合材料的设计和制备，并展示了其在光催化太阳能分解水中的优异性能。我们测量了在波长 λ = 420 ± 20 纳米时的量子效率为 16%，在 λ = 580 ± 15 纳米时为 6.29%，在 λ = 600 ± 10 纳米时为 4.42%，并确定了整体太阳能转换效率为 2.0%。该催化剂由成本低、地球丰富、环境友好的材料组成，表现出优异的稳定性。