Search

Your search keyword '"Yu, William"' showing total 15 results
Start Over Author "Yu, William" Journal nanotechnology
15 results on '"Yu, William"'

14. Low-temperature one-pot synthesis of WS 2 nanoflakes as electrocatalyst for hydrogen evolution reaction.

Author

Yin W, Ye Z, Bai X, He D, Zhang X, Song H, and Yu WW

Abstract

Transition metal dichalcogenides have unique physicochemical properties. Herein, a low-temperature facile method is demonstrated to synthesize ultrathin tungsten disulfide nanoflakes. They are loosely stacked between layers with highly exposed edges, which provide lots of active sites for electrochemical applications. The by-product of crystalline carbon improves their conductivity, which also enhances their performance in hydrogen evolution reaction.

Published
2019
Full Text
View/download PDF

15. Synthesis and characterization of Ag 2 S x Se 1-x nanocrystals and their photoelectrochemical property.

Author

Ji C, Zhang Y, Zhang X, Wang P, Shen H, Gao W, Wang Y, and Yu WW

Abstract

I-VI chalcogenide low-toxicity semiconductors and their near-infrared optical property are of great importance for solar cell and biological probe applications. Here, we report the synthesis of Ag 2 S x Se 1-x (x = 0-1) ternary nanocrystals (NCs) and their photoelectrochemical properties, using a refined simple hot-injection reaction recipe. The ICP-MS results show the change of non-metallic composition in products and precursors, which can be well fitted with Vegard's equation. Ternary alloying broadens the absorption spectrum region of Ag 2 S NCs. It can also balance the transfer of photo-excited electrons through the interfaces of TiO 2 /Ag 2 S x Se 1-x and Ag 2 S x Se 1-x /electrolyte by minimizing electron-hole recombination. By tuning the compositions, an increase in power conversion efficiency (PCE) was observed with the increase of S composition and the size of the NCs. The photoelectrochemical results reveal that Ag 2 S x Se 1-x ternary NCs exhibit higher conversion efficiency than pure binary NCs. The drop in PCE of the binary NCs is mainly attributed to the decreases of the charge separation following exciton transition.

Published
2017
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results