Hong Dachao, Sharma Aditya, Jiang Dianping, Stellino Elena, Ishiyama Tomohiro, Postorino Paolo, Placidi Ernesto, Kon Yoshihiro, Koga Kenji
Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology (AIST) 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology, (AIST) 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
ACS Omega. 2022 Aug 22;7(35):31260-31270. doi: 10.1021/acsomega.2c03509. eCollection 2022 Sep 6.
The regulation of H evolution from formic acid dehydrogenation using recyclable photocatalyst films is an essential approach for on-demand H production. We have successfully generated Au-Cu nanoalloys using a laser ablation method and deposited them on TiO photocatalyst films (Au Cu /TiO). The Au-Cu/TiO films were employed as photocatalysts for H production from formic acid dehydrogenation under light-emitting diode (LED) irradiation (365 nm). The highest H evolution rate for AuCu/TiO is archived to 62,500 μmol h g per photocatalyst weight. The remarkable performance of AuCu/TiO may account for the formation of Au-rich surfaces and the effect of Au alloying that enables Cu to sustain the metallic form on its surface. The metallic Au-Cu surface on TiO is vital to supply the photoexcited electrons of TiO to its surface for H evolution. The rate-determining step (RDS) is identified as the reaction of a surface-active species with protons. The results establish a practical preparation of metal alloy deposited on photocatalyst films using laser ablation to develop efficient photocatalysts.
利用可回收光催化剂薄膜调控甲酸脱氢制氢是按需制氢的重要途径。我们已通过激光烧蚀法成功制备了金铜纳米合金，并将其沉积在TiO光催化剂薄膜上（Au-Cu/TiO）。在发光二极管（LED）照射（365 nm）下，Au-Cu/TiO薄膜用作甲酸脱氢制氢的光催化剂。AuCu/TiO的最高产氢速率达到每克光催化剂62,500 μmol h。AuCu/TiO的卓越性能可能归因于富金表面的形成以及金合金化的作用，使得铜能够在其表面保持金属形态。TiO上的金属Au-Cu表面对于将TiO的光激发电子供应到其表面以进行析氢至关重要。速率决定步骤（RDS）被确定为表面活性物种与质子的反应。这些结果确立了一种利用激光烧蚀在光催化剂薄膜上沉积金属合金以开发高效光催化剂的实用制备方法。
