首页|Electronic structure regulation and built-in electric field synergistically strengthen photocatalytic nitrogen fixation performance on Ti-BiOBr/TiO2 heterostructure

Electronic structure regulation and built-in electric field synergistically strengthen photocatalytic nitrogen fixation performance on Ti-BiOBr/TiO2 heterostructure

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At present,industrial synthetic ammonia was still obtained through the Hubble-Bosch process,with large energy consumption.It is a research hotspot to realize green synthetic ammonia by using solar energy.The dif-ficulty of photocatalytic ammonia synthesis was that the photo-excited electrons have not enough energy to active N ≡ N.In this study,Ti was doped into BiOBr by one-step hydrothermal method,which was oxidized into TiO2 when the doping amount reaches the maximum,in situ forming Ti0.31B0.69OB/TiO2 composites.Benefiting from the syn-ergistic effect of Ti doping and S-scheme heterojunction,the synthetic ammonia efficiency of Ti0.31B0.69OB/TiO2-11.96 reached 1.643 mmol·g-1cat at mild conditions and without hole scavenger for up to 7 h,the efficiency of synthetic ammonia is 115 times,10.5 times and 3.3 times of that of BiOBr,Ti0.31B0.69OB and TiO2,respectively.Specifically,DFT calculation confirms that Ti doping accurately refine the electronic structure of BiOBr,facili-tate nitrogen adsorption activation and reduce hydrogena-tion reaction energy barrier,thus accelerating the reaction kinetics of photocatalytic nitrogen reduction(NRR).Meanwhile,constructing S-scheme heterojunction boosts the separation and transfer of photogenerated electron-hole pairs,improving the reduction ability of electrons in the conduction band of TiO2 and the oxidation ability of holes in the valence band of Ti0.31B0.69OB.

S-scheme heterostructureElectronic structure regulationBuilt-in electric fieldSynergistical stren4gtheningPhotocatalytic nitrogen fixation

Ru-Qi Li、Yu-Jie Bian、Chun-Ming Yang、Li Guo、Tao-Xia Ma、Chuan-Tao Wang、Feng Fu、Dan-Jun Wang

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College of Chemistry and Chemical Engineering,Yan'an University,Yan'an Key Laboratory of Green Catalysis and Quality Improvement and Utilization of Low Rank Coal,Yan'an 716000,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaProject of Science & Technology Office of Shannxi Province

22168040221620252022JM-062

2024

10.1007/s12598-023-02471-1

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(3)
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