Electrochromic(EC)smart windows utilizing a reversible metal electrodeposition device(RMED)offer a compelling alternative for dynamically regulating transmissions of optical and thermal energy.An EC device(ECD)is cons...Electrochromic(EC)smart windows utilizing a reversible metal electrodeposition device(RMED)offer a compelling alternative for dynamically regulating transmissions of optical and thermal energy.An EC device(ECD)is constructed by reversible metal electrodeposition(RME)of Bi/Cu on WO_(3)·xH_(2)O film electrodeposited onto fluorine-doped tin oxide(FTO)transparent conductive glass.The electrolyte consists of CuCl_(2),BiCl_(3),KCl and HCl aqueous solution,supplying necessary components for both electrochemical and electrodeposition processes.The ECD shows ability to rapidly transition between colorless and black states,which achieves a large optical modulation of 77.0%at 570 nm.In the black state,the ECD exhibits a near-zero transmittance in the wavelength range of 400-1100 nm while maintaining 96.6%of its initial optical modulation after coloration/bleaching cycling of 60000 s,exhibiting good cyclic stability.This RMED has relatively high stability under open-circuit voltage and also possesses excellent heat insulation performance.The results offer a solution to overcome the poor cyclic stability of RMEDs and improve the optical modulation of ECDs.展开更多
The integration of selective oxidation of renewable biomass and its derivatives with hydrogen(H_(2))pro-duction holds significant potential for simultaneously yielding value-added chemicals and“green H_(2)”,contribu...The integration of selective oxidation of renewable biomass and its derivatives with hydrogen(H_(2))pro-duction holds significant potential for simultaneously yielding value-added chemicals and“green H_(2)”,contributing to addressing sustainability challenges.The S-scheme charge transfer mechanism enhances charge separation by maintaining strong redox potentials at both ends,facilitating both oxidation and reduction reactions.Herein,we synthesize a visible-light-responsive oxygen vacancy-rich In_(2)O_(3-x)/tubular carbon nitride(IO_(OV)/TCN)S-scheme heterojunction photocatalyst via electrostatic adherence for selec-tive 5-hydroxymethylfurfural(HMF)oxidation to 2,5-diformylfuran(DFF)and 2,5-furandicarboxylic acid(FDCA),alongside H_(2)production.Under anaerobic conditions and visible-light irradiation,the optimal IOOV/TCN-10 catalyst achieves an HMF conversion of 94.8%with a selectivity of 53.6%for DFF and FDCA,and a H_(2)yield of 754.05μmol g^(−1)in 3 h.The significantly improved photocatalytic activity results from enhanced visible-light absorption,reduced carrier recombination,and abundant catalytic active sites due to the synergistic effect of surface oxygen vacancies,the hollow nanotube-based architecture,and the S-scheme charge transfer mechanism.This work highlights the great potentials of S-scheme heterojunctions in biomass conversion for sustainable energy use and chemical production.展开更多
The crystallization behavior and kinetics of CaO-MgO-Al2O3 SiO2（CMAS） glass with the Fe2O3 content ranging from zero to 5%were investigated by differential scanning calorimetry（DSC）.The structure and phase analyse...The crystallization behavior and kinetics of CaO-MgO-Al2O3 SiO2（CMAS） glass with the Fe2O3 content ranging from zero to 5%were investigated by differential scanning calorimetry（DSC）.The structure and phase analyses were made by Fourier transform infrared spectroscopy（FT-IR） and X-ray diffraction（XRD）.The experiment results show that the endothermic peak temperature about 760℃ is associated with transition and the exothermic peak temperature about 1000℃ is associated with crystallization.The crystallization peak temperature decreases with increasing the Fe203 content.The crystallization mechanism is changed from two-dimensional crystallization to one-dimensional growth,and the intensity of diopside peaks becomes stronger gradually.There is a saltation for the crystallization temperature with the addition of 0.5%Fe2O3 due to the decomposition of Fe2O3.Si-O-Si,O-Si-O and T-O-T（T=Si,Fe,Al） linkages are observed in Fe2O3-CaO-MgO-Al2O3-SiO2 glass.展开更多
文摘Electrochromic(EC)smart windows utilizing a reversible metal electrodeposition device(RMED)offer a compelling alternative for dynamically regulating transmissions of optical and thermal energy.An EC device(ECD)is constructed by reversible metal electrodeposition(RME)of Bi/Cu on WO_(3)·xH_(2)O film electrodeposited onto fluorine-doped tin oxide(FTO)transparent conductive glass.The electrolyte consists of CuCl_(2),BiCl_(3),KCl and HCl aqueous solution,supplying necessary components for both electrochemical and electrodeposition processes.The ECD shows ability to rapidly transition between colorless and black states,which achieves a large optical modulation of 77.0%at 570 nm.In the black state,the ECD exhibits a near-zero transmittance in the wavelength range of 400-1100 nm while maintaining 96.6%of its initial optical modulation after coloration/bleaching cycling of 60000 s,exhibiting good cyclic stability.This RMED has relatively high stability under open-circuit voltage and also possesses excellent heat insulation performance.The results offer a solution to overcome the poor cyclic stability of RMEDs and improve the optical modulation of ECDs.
基金financially supported by the Natural Science Foundation of China(Nos.21972058,22102064,and 22302080)Anhui Key Laboratory of Nanomaterials and Nanotechnology,the Major Science and Technology Projects in Anhui Province(No.202305a12020006).
文摘The integration of selective oxidation of renewable biomass and its derivatives with hydrogen(H_(2))pro-duction holds significant potential for simultaneously yielding value-added chemicals and“green H_(2)”,contributing to addressing sustainability challenges.The S-scheme charge transfer mechanism enhances charge separation by maintaining strong redox potentials at both ends,facilitating both oxidation and reduction reactions.Herein,we synthesize a visible-light-responsive oxygen vacancy-rich In_(2)O_(3-x)/tubular carbon nitride(IO_(OV)/TCN)S-scheme heterojunction photocatalyst via electrostatic adherence for selec-tive 5-hydroxymethylfurfural(HMF)oxidation to 2,5-diformylfuran(DFF)and 2,5-furandicarboxylic acid(FDCA),alongside H_(2)production.Under anaerobic conditions and visible-light irradiation,the optimal IOOV/TCN-10 catalyst achieves an HMF conversion of 94.8%with a selectivity of 53.6%for DFF and FDCA,and a H_(2)yield of 754.05μmol g^(−1)in 3 h.The significantly improved photocatalytic activity results from enhanced visible-light absorption,reduced carrier recombination,and abundant catalytic active sites due to the synergistic effect of surface oxygen vacancies,the hollow nanotube-based architecture,and the S-scheme charge transfer mechanism.This work highlights the great potentials of S-scheme heterojunctions in biomass conversion for sustainable energy use and chemical production.
基金Projects(51264023,51364020,U1202271)supported by the National Natural Science Foundation of ChinaProject(IRT1250)supported by the Program for Innovative Research Team in University of Ministry of Education of ChinaProject(2014HA003)supported by the Science and Technology Leading Talent of Yunnan Province,China
文摘The crystallization behavior and kinetics of CaO-MgO-Al2O3 SiO2（CMAS） glass with the Fe2O3 content ranging from zero to 5%were investigated by differential scanning calorimetry（DSC）.The structure and phase analyses were made by Fourier transform infrared spectroscopy（FT-IR） and X-ray diffraction（XRD）.The experiment results show that the endothermic peak temperature about 760℃ is associated with transition and the exothermic peak temperature about 1000℃ is associated with crystallization.The crystallization peak temperature decreases with increasing the Fe203 content.The crystallization mechanism is changed from two-dimensional crystallization to one-dimensional growth,and the intensity of diopside peaks becomes stronger gradually.There is a saltation for the crystallization temperature with the addition of 0.5%Fe2O3 due to the decomposition of Fe2O3.Si-O-Si,O-Si-O and T-O-T（T=Si,Fe,Al） linkages are observed in Fe2O3-CaO-MgO-Al2O3-SiO2 glass.
