In this study,the nickel derivative of a salen-type Schiff base was pyrolyzed under controlled conditions to form a nano-sized Ni/NiO_(x)core–shell species that serves as a model for a proof-of-concept investigation ...In this study,the nickel derivative of a salen-type Schiff base was pyrolyzed under controlled conditions to form a nano-sized Ni/NiO_(x)core–shell species that serves as a model for a proof-of-concept investigation of the relationship between pyrolysis temperature and electrocatalytic activity.The pyrolytic process was tracked via measurements of crystallinity,carbon defect,specific surface area,heterogeneous elemental doping and elemental distribution.The decomposition process was elucidated by TG-MS;the electrochemical characteristics of the residue were deduced from synchrotron XAFS combined with HRTEM,XRD and XPS(Ni(C_(26)H_(28)N_(3)O_(4))→Ni/NiO_(x)+(C_(x)H_(y),H_(2),CO_(2)+CH_(3)O)→Ni/NiO_(x)@NCs).An optimized specimen(coded S–Ni-800)provided 268 mV overpotential in OERs and 1.353 V in UORs,and was stable for 15 hours in an alkaline medium.This model study underscores the importance of thermal tracking in the design of Ni-derived carbon nanomaterial electrocatalysts that are associated with OERs/UORs at low potentials.展开更多
In this work,a novel Z-scheme Bi_(5)O_(7-δ)I/CeO_(2-δ)heterojunction photocatalyst was prepared by combining hydrothermal synthesis and thermal treatment methods.Oxygen vacancies were in situ generated on the surfac...In this work,a novel Z-scheme Bi_(5)O_(7-δ)I/CeO_(2-δ)heterojunction photocatalyst was prepared by combining hydrothermal synthesis and thermal treatment methods.Oxygen vacancies were in situ generated on the surface of Bi_(5)O_(7-δ)I and CeO_(2-δ)nanostructures.The existence of oxygen vacancies significantly improved the light absorption of CeO_(2-δ)and inhibited the recombination of photogenerated carriers.Based on the photocatalytic activity,the as-prepared Bi_(5)O_(7-δ)I/CeO_(2-δ)photocatalyst exhibited excellent photocatalytic NO removal performance under visible light irradiation.The results of the capture experiment and electron spin resonance(ESR)spectroscopy show that super oxygen radicals(·O_(2)^(-))and hydroxyl radicals(·OH)are the main active species in the overall photocatalytic reaction process.Density functional theory(DFT)calculations and ESR results demonstrate that a Z-scheme heterojunction is formed between Bi_(5)O_(7-δ)I and CeO_(2-δ).Compared with the traditional type-Ⅱ heterojunction,the Z-scheme heterojunction exhibited more efficient charge separation and robust redox capacity in the photocatalytic reaction.展开更多
Dictyophora indusiata(D.indusiata),a valuable medicinal and edible mushroom,is known for its numerous health benefits,but its pileus is often overlooked.In this study,we utilized Halomonas species TD01(Halomonas sp.TD...Dictyophora indusiata(D.indusiata),a valuable medicinal and edible mushroom,is known for its numerous health benefits,but its pileus is often overlooked.In this study,we utilized Halomonas species TD01(Halomonas sp.TD01)to ferment extracts of D.indusiata pileus to facilitate the release of bioactive components and enhance antioxidant activity.The results showed that Halomonas sp.TD01 effectively converted the extracts into a series of active metabolites.The fermented broth not only scavenged free radicals directly but also alleviated oxidative stress induced by tert-butyl hydrogen peroxide in HaCaT cells.By increasing catalase activity and glutathione levels,it enhances cellular antioxidant defence mechanisms,and this effect was confirmed to be closely linked to the Nrf2 signaling pathway.Furthermore,network pharmacological analysis identified potential targets for the antioxidant activity of the fermented broth:mitogen-activated protein kinase 3,tumor protein p53,protein kinase B1,albumin,tumor necrosis factor,and insulin.In conclusion,fermentation using Halomonas sp.TD01 effectively transforms active components in D.indusiata pileus and enhances its antioxidant capacity.These findings pave a new way for the development of D.indusiata pileus in potential health benefits and provide strong support for its application in various fields such as food production,cosmetic development,and pharmaceuticals.展开更多
基金financially supported by the NSFC(Grant 22171075)NSFC of Hubei(Grant 2021CFB420)the BAGUI Talent Program(2019AC26001).
文摘In this study,the nickel derivative of a salen-type Schiff base was pyrolyzed under controlled conditions to form a nano-sized Ni/NiO_(x)core–shell species that serves as a model for a proof-of-concept investigation of the relationship between pyrolysis temperature and electrocatalytic activity.The pyrolytic process was tracked via measurements of crystallinity,carbon defect,specific surface area,heterogeneous elemental doping and elemental distribution.The decomposition process was elucidated by TG-MS;the electrochemical characteristics of the residue were deduced from synchrotron XAFS combined with HRTEM,XRD and XPS(Ni(C_(26)H_(28)N_(3)O_(4))→Ni/NiO_(x)+(C_(x)H_(y),H_(2),CO_(2)+CH_(3)O)→Ni/NiO_(x)@NCs).An optimized specimen(coded S–Ni-800)provided 268 mV overpotential in OERs and 1.353 V in UORs,and was stable for 15 hours in an alkaline medium.This model study underscores the importance of thermal tracking in the design of Ni-derived carbon nanomaterial electrocatalysts that are associated with OERs/UORs at low potentials.
基金supported by the National Natural Science Foundation of China(Grant No.51772183 and 52072230)the Fundamental Research Funds for the Central Universities(2020TS028).
文摘In this work,a novel Z-scheme Bi_(5)O_(7-δ)I/CeO_(2-δ)heterojunction photocatalyst was prepared by combining hydrothermal synthesis and thermal treatment methods.Oxygen vacancies were in situ generated on the surface of Bi_(5)O_(7-δ)I and CeO_(2-δ)nanostructures.The existence of oxygen vacancies significantly improved the light absorption of CeO_(2-δ)and inhibited the recombination of photogenerated carriers.Based on the photocatalytic activity,the as-prepared Bi_(5)O_(7-δ)I/CeO_(2-δ)photocatalyst exhibited excellent photocatalytic NO removal performance under visible light irradiation.The results of the capture experiment and electron spin resonance(ESR)spectroscopy show that super oxygen radicals(·O_(2)^(-))and hydroxyl radicals(·OH)are the main active species in the overall photocatalytic reaction process.Density functional theory(DFT)calculations and ESR results demonstrate that a Z-scheme heterojunction is formed between Bi_(5)O_(7-δ)I and CeO_(2-δ).Compared with the traditional type-Ⅱ heterojunction,the Z-scheme heterojunction exhibited more efficient charge separation and robust redox capacity in the photocatalytic reaction.
基金the National Natural Science Foundation of China(Grant nos.51975458 and 51605370)Key R&D program of Shaanxi Province(2022SF-069).
文摘Dictyophora indusiata(D.indusiata),a valuable medicinal and edible mushroom,is known for its numerous health benefits,but its pileus is often overlooked.In this study,we utilized Halomonas species TD01(Halomonas sp.TD01)to ferment extracts of D.indusiata pileus to facilitate the release of bioactive components and enhance antioxidant activity.The results showed that Halomonas sp.TD01 effectively converted the extracts into a series of active metabolites.The fermented broth not only scavenged free radicals directly but also alleviated oxidative stress induced by tert-butyl hydrogen peroxide in HaCaT cells.By increasing catalase activity and glutathione levels,it enhances cellular antioxidant defence mechanisms,and this effect was confirmed to be closely linked to the Nrf2 signaling pathway.Furthermore,network pharmacological analysis identified potential targets for the antioxidant activity of the fermented broth:mitogen-activated protein kinase 3,tumor protein p53,protein kinase B1,albumin,tumor necrosis factor,and insulin.In conclusion,fermentation using Halomonas sp.TD01 effectively transforms active components in D.indusiata pileus and enhances its antioxidant capacity.These findings pave a new way for the development of D.indusiata pileus in potential health benefits and provide strong support for its application in various fields such as food production,cosmetic development,and pharmaceuticals.
