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

被引:4244
作者
Liu, Juan [1 ]
Liu, Yang [1 ]
Liu, Naiyun [1 ]
Han, Yuzhi [1 ]
Zhang, Xing [1 ]
Huang, Hui [1 ]
Lifshitz, Yeshayahu [1 ,2 ]
Lee, Shuit-Tong [1 ]
Zhong, Jun [1 ]
Kang, Zhenhui [1 ]
机构
[1] Soochow Univ, Inst Funct Nano & Soft Mat FUNSOM, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Suzhou 215123, Peoples R China
[2] Technion Israel Inst Technol, Dept Mat Sci & Engn, IL-3200003 Haifa, Israel
基金
中国国家自然科学基金; 美国国家科学基金会;
关键词
GRAPHITIC CARBON NITRIDE; HYDROGEN-PRODUCTION; H-2; EVOLUTION; LIGHT-DRIVEN; PHOTOSYSTEM-II; SOLAR-ENERGY; PERFORMANCE; COMPOSITES; NANOCOMPOSITE; NANOPARTICLES;
D O I
10.1126/science.aaa3145
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The use of solar energy to produce molecular hydrogen and oxygen (H-2 and O-2) 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 lambda = 420 +/- 20 nanometers, 6.29% for lambda = 580 +/- 15 nanometers, and 4.42% for lambda = 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.
引用
收藏
页码:970 / 974
页数:5
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