A ternary g-C3N4/Pt/ZnO photoanode for efficient photoelectrochemical water splitting
A ternary g-C3N4/Pt/ZnO photoanode for efficient photoelectrochemical water splitting
复制标题
DOI：
10.1016/j.ijhydene.2015.05.122
复制
发表时间：
2015-08
影响因子：
7.2
通讯作者：
Jingran Xiao;Xiaoli Zhang;Yongdan Li
中科院分区：
文献类型：
--
作者：
Jingran Xiao;Xiaoli Zhang;Yongdan Li
在ZnO纳米线表面沉积类石墨C3 N4（g-C3 N4），制备纳米复合g-C3 N4/ZnO光阳极，并在空气质量1.5（AM 1.5）模拟太阳光照射下进行光电化学（PEC）分解水。在g-C3 N4/ZnO界面处进一步引入Pt纳米团簇，并采用三组分C3 N4/Pt/ZnO光阳极。g-C3 N4和ZnO都作为光吸收体产生电子空穴对，而Pt纳米团簇作为助催化剂促进光生电子的转移. g-C3 N4/Pt/ZnO光阳极在0.5 V vs. Ag/AgCl和0.5 M Na 2SO 4溶液中产生的光电流密度为120 μA cm− 2，比ZnO制成的阳极高9倍，比g-C3 N4/ZnO阳极高4.5倍。此外，由于g-C3 N4的可见光吸收，g-C3 N4/Pt/ZnO光阳极在可见光（λ> 420 nm）照射下在0.5 V vs. Ag/AgCl下产生32 μA cm− 2的光电流密度。
In this work, graphite-like C3N4(g-C3N4) is deposited on the surface of ZnO nanowires (NWs) and a nanocomposite g-C3N4/ZnO photoanode is made for the photoelectrochemical (PEC) water splitting under air mass 1.5 (AM 1.5) simulated sunlight illumination. Pt nanoclusters are further incorporated at the g-C3N4/ZnO interface and a tricomponent C3N4/Pt/ZnO photoanode is adapted. Both g-C3N4and ZnO act as the light absorber to create electron hole pairs, while the Pt nanoclusters serve as the cocatalyst to facilitate the transfer of the photogenerated electrons. The g-C3N4/Pt/ZnO photoanode generates a photocurrent density of 120 μA cm−2at 0.5 V vs. Ag/AgCl in a 0.5 M Na2SO4solution, which is 9 times higher than that of the anode made of ZnO and 4.5 times higher than that of the g-C3N4/ZnO anode. Furthermore, with the visible light absorption of g-C3N4, the g-C3N4/Pt/ZnO photoanode gives a photocurrent density of 32 μA cm−2at 0.5 V vs. Ag/AgCl under visible light (λ> 420 nm) illumination.