In this study,CuBi2O4 photocathodes were prepared using a simple electrodeposition method for photoelectrochemical(PEC)hydrogen production.The prepared photocathodes were modified with amorphous TiO2 and a Pt co‐cata...In this study,CuBi2O4 photocathodes were prepared using a simple electrodeposition method for photoelectrochemical(PEC)hydrogen production.The prepared photocathodes were modified with amorphous TiO2 and a Pt co‐catalyst,which resulted in the formation of CuBi2O4/TiO2 p‐n heterojunctions,and enhanced the activities of the as‐prepared photocathodes.The novel Pt/TiO2/CuBi2O4 photocathode exhibited a photocurrent of 0.35 mA/cm2 at 0.60 V vs.Reversible Hydrogen Electrode(RHE),which was nearly twice that of the Pt/CuBi2O4 photocathode.The present study provides a facile method for increasing the efficiency of photocathodes and provides meaningful guidance for the preparation of high‐performance CuBi2O4 photocathodes.展开更多
As the misuse and overuse of tetracycline(TC)contribute to water pollution,it is imperative to explore an efficient and cost-effective approach for the removal of TC in aqueous solution.Photocatalysis is a green and s...As the misuse and overuse of tetracycline(TC)contribute to water pollution,it is imperative to explore an efficient and cost-effective approach for the removal of TC in aqueous solution.Photocatalysis is a green and sustainable chemical technique because of its utilization of solar energy.From the view of practical application,it is significant to design a highly efficient,stable,eco-friendly and economical photocatalyst.In this work,CuBi_(2)O_(4)/g-C_(3)N_(4) p–n heterojunctions with different CuBi_(2)O_(4) content(10–90 wt%)were prepared via a facile calcining method.The CuBi_(2)O_(4)/g-C_(3)N_(4) heterojunctions exhibit superior photocatalytic activity in the degradation of TC,compared with pristine CuBi_(2)O_(4) and g-C_(3)N_(4).The optimum photoactivity of 70 wt%CuBi_(2)O_(4)/g-C_(3)N_(4) is up to 4 and 6 times higher than that of CuBi_(2)O_(4) and g-C_(3)N_(4),respectively.The enhanced photocatalytic activity can be attributed to p–n junction photocatalytic systems,which effectively promote charge carrier separation and transfer.It is anticipated that the design of CuBi_(2)O_(4)/g-C_(3)N_(4) could offer the insight needed to construct inexpensive and highly efficient g-C_(3)N_(4)-based heterojunction photocatalysts,to relieve urgent environmental deterioration.展开更多
CuBi_(2)O_(4) and CuWO_(4) films(2×2 cm)on an FTO substrate have been fabricated to construct an allcopper-based oxide tandem cell for solar-driven photoelectrochemical(PEC)water splitting.CuBi_(2)O_(4) and CuWO_...CuBi_(2)O_(4) and CuWO_(4) films(2×2 cm)on an FTO substrate have been fabricated to construct an allcopper-based oxide tandem cell for solar-driven photoelectrochemical(PEC)water splitting.CuBi_(2)O_(4) and CuWO_(4) films are of opposite semiconductivity,and exhibit a large difference in the onset potentials and matched light absorption,making them ideal for a tandem configuration for solar energy conversion.Under optimal conditions,the tandem cell(4 cm^(2))exhibits a water splitting photocurrent of 0.3 mA without an external bias under simulated solar insolation.The low cost,non-toxicity,good stability and easy manufacture of this copper-based oxide tandem cell warrant promising applications in the field of solar energy conversion.展开更多
The photoelectrochemical nitrate reduction reaction(PEC-NIRR)provides a sustainable solution for addressing nitrogen-containing wastewater pollution and green ammonia synthesis.However,the reported catalysts are still...The photoelectrochemical nitrate reduction reaction(PEC-NIRR)provides a sustainable solution for addressing nitrogen-containing wastewater pollution and green ammonia synthesis.However,the reported catalysts are still limited by issues such as low carrier separation efficiency and competition from the hydrogen evolution reaction(HER).A surface sulfidation strategy was employed to epitaxially grow Bi_(2)S_(3)in situ on the surface of CuBi_(2)O_(4),successfully constructing a CuBi_(2)O_(4)/Bi_(2)S_(3)catalyst.Based on the narrow bandgap(1.67 eV)and sulfur atom active sites of Bi_(2)S_(3),a type II band arrangement and atomic level contact were configured.The oxygen vacancy(Ov)concentration could be regulated to 48.98%,significantly promoting charge separation and the generation of hydrogen radicals(H*).Under illumination,CuBi_(2)O_(4)/Bi_(2)S_(3)achieves a high NH_(3)production rate of 33.69μg h^(−1)cm^(−2),which is 3.84 times that of CuBi_(2)O_(4).The by-product NO_(2)−production rate was significantly suppressed,contributing to an excellent selectivity(59.71%).FTIR and 1H NMR spectroscopic analyses further confirmed that NH3 generation was entirely derived from NO_(3)^(−).Therefore,this work offers a novel strategy of in situ sulfidation for boosting the intrinsic activity of polymetallic oxide catalysts.展开更多
基金the National Natural Science Foundation of China(51602179,21333006,21573135,11374190)the National Basic Research Program of China(973 Program,2013CB632401)~~
文摘In this study,CuBi2O4 photocathodes were prepared using a simple electrodeposition method for photoelectrochemical(PEC)hydrogen production.The prepared photocathodes were modified with amorphous TiO2 and a Pt co‐catalyst,which resulted in the formation of CuBi2O4/TiO2 p‐n heterojunctions,and enhanced the activities of the as‐prepared photocathodes.The novel Pt/TiO2/CuBi2O4 photocathode exhibited a photocurrent of 0.35 mA/cm2 at 0.60 V vs.Reversible Hydrogen Electrode(RHE),which was nearly twice that of the Pt/CuBi2O4 photocathode.The present study provides a facile method for increasing the efficiency of photocathodes and provides meaningful guidance for the preparation of high‐performance CuBi2O4 photocathodes.
基金supported by the Collaborative Innovation Center of Suzhou Nano Science and Technology,the National Natural Science Foundation of China(51422207,51572179,21471106,21501126)the Natural Science Foundation of Jiangsu Province(BK20161216)a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD).
文摘As the misuse and overuse of tetracycline(TC)contribute to water pollution,it is imperative to explore an efficient and cost-effective approach for the removal of TC in aqueous solution.Photocatalysis is a green and sustainable chemical technique because of its utilization of solar energy.From the view of practical application,it is significant to design a highly efficient,stable,eco-friendly and economical photocatalyst.In this work,CuBi_(2)O_(4)/g-C_(3)N_(4) p–n heterojunctions with different CuBi_(2)O_(4) content(10–90 wt%)were prepared via a facile calcining method.The CuBi_(2)O_(4)/g-C_(3)N_(4) heterojunctions exhibit superior photocatalytic activity in the degradation of TC,compared with pristine CuBi_(2)O_(4) and g-C_(3)N_(4).The optimum photoactivity of 70 wt%CuBi_(2)O_(4)/g-C_(3)N_(4) is up to 4 and 6 times higher than that of CuBi_(2)O_(4) and g-C_(3)N_(4),respectively.The enhanced photocatalytic activity can be attributed to p–n junction photocatalytic systems,which effectively promote charge carrier separation and transfer.It is anticipated that the design of CuBi_(2)O_(4)/g-C_(3)N_(4) could offer the insight needed to construct inexpensive and highly efficient g-C_(3)N_(4)-based heterojunction photocatalysts,to relieve urgent environmental deterioration.
基金the National Natural Science Foundation of China(Grant No.51972233)the Natural Science Foundation of Shanghai(Grant No.19ZR1459200)+1 种基金the Shanghai Science and Technology Commission(14DZ2261100)the Fundamental Research Funds for the Central Universities for funding.
文摘CuBi_(2)O_(4) and CuWO_(4) films(2×2 cm)on an FTO substrate have been fabricated to construct an allcopper-based oxide tandem cell for solar-driven photoelectrochemical(PEC)water splitting.CuBi_(2)O_(4) and CuWO_(4) films are of opposite semiconductivity,and exhibit a large difference in the onset potentials and matched light absorption,making them ideal for a tandem configuration for solar energy conversion.Under optimal conditions,the tandem cell(4 cm^(2))exhibits a water splitting photocurrent of 0.3 mA without an external bias under simulated solar insolation.The low cost,non-toxicity,good stability and easy manufacture of this copper-based oxide tandem cell warrant promising applications in the field of solar energy conversion.
基金supported by the National Natural Science Foundation of China(22075112)the College Student Practice Innovation Training Program Project(3221306040)the Open Project Funded by Key Laboratory of Green Extraction&Efficient Utilization of Light Rare-Earth Resources,Ministry of Education(KLRE-KF-007).
文摘The photoelectrochemical nitrate reduction reaction(PEC-NIRR)provides a sustainable solution for addressing nitrogen-containing wastewater pollution and green ammonia synthesis.However,the reported catalysts are still limited by issues such as low carrier separation efficiency and competition from the hydrogen evolution reaction(HER).A surface sulfidation strategy was employed to epitaxially grow Bi_(2)S_(3)in situ on the surface of CuBi_(2)O_(4),successfully constructing a CuBi_(2)O_(4)/Bi_(2)S_(3)catalyst.Based on the narrow bandgap(1.67 eV)and sulfur atom active sites of Bi_(2)S_(3),a type II band arrangement and atomic level contact were configured.The oxygen vacancy(Ov)concentration could be regulated to 48.98%,significantly promoting charge separation and the generation of hydrogen radicals(H*).Under illumination,CuBi_(2)O_(4)/Bi_(2)S_(3)achieves a high NH_(3)production rate of 33.69μg h^(−1)cm^(−2),which is 3.84 times that of CuBi_(2)O_(4).The by-product NO_(2)−production rate was significantly suppressed,contributing to an excellent selectivity(59.71%).FTIR and 1H NMR spectroscopic analyses further confirmed that NH3 generation was entirely derived from NO_(3)^(−).Therefore,this work offers a novel strategy of in situ sulfidation for boosting the intrinsic activity of polymetallic oxide catalysts.
