Red phosphorus decorated and doped TiO2 nanofibers for efficient photocatalytic hydrogen evolution from pure water

Yukun Zhu,Junzhi Li,Chung-Li Dong,Jun Ren,Yu-Cheng Huang,Daming Zhao,Rongsheng Cai,Daixing Wei,Xianfeng Yang,Chunxiao Lv,Wolfgang Theis,Yuyu Bu,Wei Han,Shaohua Shen,Dongjiang Yang

doi:10.1016/j.apcatb.2019.117764

Abstract

In this study, we report a facile strategy to prepare a new class of red phosphorus (RP) decorated and doped TiO2 (A: anatase and B: TiO2(B)) nanofibers with boosted photocatalytic hydrogen evolution reaction (HER) performance from pure water. The optimized TiO2(B)/RP and TiO2(A)/RP heterostructure exhibits significantly enhanced photocatalytic performances, with HER rate reaching 11.4 and 5.3 μmol h−1, respectively. The optical absorption of TiO2 is significantly extended to the visible light region after decoration of RP. And more oxygen vacancies (VO) were introduced by phosphorus doping in the TiO2(B)/RP than TiO2(A)/RP. The theoretical calculations illustrate the formation of VO can decrease the ratio of effective masses of electron to hole, which gives rise to promoted photoinduced charge separation and transfer. These results suggest that the boosted photocatalytic HER performance should be mainly attributed to the synergetic enhancement in light harvesting and charge separation enabled by RP deposition and P5+ doping.

Highlights

With increasing interest in hydrogen as an environmentally acceptable, alternative energy carrier with high energy density, several emerging clean-energy technologies have been discovered to pursue sustainable and efficient hydrogen production, such as photocatalytic [1,2], electrocatalytic [3,4] and photoelectrocatalytic [5,6] water splitting into hydrogen
The as-prepared TiO2 NFs were mixed with different amounts of red phosphorus (RP) powders, which were sealed into a quartz ampoule under vacuum condition (Fig. S1)
S The phase composition and the crystal structure of the TiO2 nanofiber/red phosphorus (TiO2/RP) composites were investigated by U X-ray diffraction (XRD)

Summary

April 2019 17 May 2019 19 May 2019

M b International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China. H Key Laboratory of Wide Band-Gap Semiconductor Materials and Devices, School of Microelectronics, Xidian University, Xi'an 710071, China. A new class of TiO2 nanofiber/red phosphorus (TiO2/RP) nanolayer core/shell heterostructure was fabricated by vaporization-deposition strategy. P In this study, we report a facile strategy to prepare a new class of red phosphorus (RP) decorated I and doped TiO2 (A: anatase and B: TiO2(B)) nanofibers with boosted photocatalytic hydrogen CR evolution reaction (HER) performance from pure water. D results suggest that the boosted photocatalytic HER performance should be mainly attributed to the E synergetic enhancement in light harvesting and charge separation enabled by RP deposition and PT P5+ doping.

Introduction

Results and discussion

A1 pre-peak A4

Conclusion

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