The g-C_(3)N_(4)/BiOI/CdS double Z-scheme heterojunction photocatalyst with I_(3)^(-)/I^(-) redox pairs is prepared using simple calcination,solvothermal,and solution chemical deposition methods.The photocatalyst comp...The g-C_(3)N_(4)/BiOI/CdS double Z-scheme heterojunction photocatalyst with I_(3)^(-)/I^(-) redox pairs is prepared using simple calcination,solvothermal,and solution chemical deposition methods.The photocatalyst comprised mesoporous,thin g-C_(3)N_(4) nanosheets loaded on flower-like microspheres of BiOI with CdS quantum dots.The g-C_(3)N_(4)/BiOI/CdS double Z-scheme heterojunction has abundant active sites and in situ redox I_(3)^(-)/I^(-) mediators and shows quantum size effects,which are all conducive to enhancing the separation of photoinduced charges and increasing the photocatalytic degradation efficiency for bisphenol A,a model pollutant.Specifically,the heterojunction photocatalyst achieves a photocatalytic degradation efficiency for bisphenol A of 98.62%in 120 min and photocatalytic hydrogen production of 863.44 mmol h^(-1) g^(-1) on exposure to visible light.The excellent visible-light photocatalytic performance is as a result of the Z-scheme heterojunction,which extends absorption to the visible light region,as well as the I_(3)^(-)/I^(-) pairs,which accelerate photoinduced charge carrier transfer and separation,thus dramatically boosting the photocatalytic performance.In addition,the key role of the charge transfer across the indirect Z-scheme heterojunction has been elucidated and the transfer mechanism is confirmed based on the detection of intermediate I_(3)^(-)ions.Thus,this study provides guidelines for the design of indirect Z-scheme heterojunction photocatalysts.展开更多
The formation of inactive lithium(Li)in Li metal battery(LMB)primarily originates from the undesirable components of solid electrolyte interphase(SEI)and the growth of dendritic Li.LiNO_(3)has emerged as a promising e...The formation of inactive lithium(Li)in Li metal battery(LMB)primarily originates from the undesirable components of solid electrolyte interphase(SEI)and the growth of dendritic Li.LiNO_(3)has emerged as a promising electrolyte additive for mitigating interfacial instability and Li dendrite propagation through the in situ construction of nitride-rich SEI.However,the limited solubility of LiNO_(3)in carbonate electrolytes hinders its practical utilization.Herein,the bifunctional I^(-)-MgAl layered double hydroxide(LDH)is proposed to synergistically dissolve LiNO_(3)and rejuvenate inactive Li.The anion-exchange capability of LDH facilitates the substitution of native I^(-)with NO_(3)^(-),forming NO_(3)^(-)-MgAl LDH and simultaneously generating I_(3)^(-)/I^(-)redox mediators in electrolyte.This substitution not only achieves the dissolution of LiNO_(3),serving as a sustainable nitrogen source to optimize SEI components,but also enables the extracted I_(3)^(-)/I^(-)redox couple to react spontaneously with inactive Li,remarkably enhancing the coulombic efficiency.Consequently,the engineered electrolyte significantly extends the lifespan of Li||LiFePO4,Li||NCM,and Li@Cu||LiFePO4 cells.The unique architecture of LDH can precisely control the storage and release of NO_(3)^(-)and I^(-),offering a transformative electrolyte design framework for next-generation batteries by integrating two-dimensional material properties with electrochemical mechanisms.展开更多
基金国家自然科学基金联合基金项目(U21A20485)浙江省高等教育“十四五”本科教育教学改革项目(jg20220019)+3 种基金浙江省产学合作协同育人项目(202018)浙江大学2023年度本科教学创新实践项目重点项目(202309)浙江省基础公益研究计划项目(LGG22F030008)浙江大学第一批AI For Education系列实证教学研究项目(202402)。
基金support of this work by the National Natural Science Foundation of China(51869006)Jiangxi Natural Science Foundation of China(20171BAB216050)Water Science and Technology Fund of Jiangxi Province in China(KT201702).
文摘The g-C_(3)N_(4)/BiOI/CdS double Z-scheme heterojunction photocatalyst with I_(3)^(-)/I^(-) redox pairs is prepared using simple calcination,solvothermal,and solution chemical deposition methods.The photocatalyst comprised mesoporous,thin g-C_(3)N_(4) nanosheets loaded on flower-like microspheres of BiOI with CdS quantum dots.The g-C_(3)N_(4)/BiOI/CdS double Z-scheme heterojunction has abundant active sites and in situ redox I_(3)^(-)/I^(-) mediators and shows quantum size effects,which are all conducive to enhancing the separation of photoinduced charges and increasing the photocatalytic degradation efficiency for bisphenol A,a model pollutant.Specifically,the heterojunction photocatalyst achieves a photocatalytic degradation efficiency for bisphenol A of 98.62%in 120 min and photocatalytic hydrogen production of 863.44 mmol h^(-1) g^(-1) on exposure to visible light.The excellent visible-light photocatalytic performance is as a result of the Z-scheme heterojunction,which extends absorption to the visible light region,as well as the I_(3)^(-)/I^(-) pairs,which accelerate photoinduced charge carrier transfer and separation,thus dramatically boosting the photocatalytic performance.In addition,the key role of the charge transfer across the indirect Z-scheme heterojunction has been elucidated and the transfer mechanism is confirmed based on the detection of intermediate I_(3)^(-)ions.Thus,this study provides guidelines for the design of indirect Z-scheme heterojunction photocatalysts.
基金supported by the National Natural Science Foundation of China(U20A20123,22379166,and 51874357)the Natural Science Foundation for Distinguished Young Scholars of Hunan Province(2022JJ10089)the Central South University Innovation-Driven Research Programme(2023CXQD034).
文摘The formation of inactive lithium(Li)in Li metal battery(LMB)primarily originates from the undesirable components of solid electrolyte interphase(SEI)and the growth of dendritic Li.LiNO_(3)has emerged as a promising electrolyte additive for mitigating interfacial instability and Li dendrite propagation through the in situ construction of nitride-rich SEI.However,the limited solubility of LiNO_(3)in carbonate electrolytes hinders its practical utilization.Herein,the bifunctional I^(-)-MgAl layered double hydroxide(LDH)is proposed to synergistically dissolve LiNO_(3)and rejuvenate inactive Li.The anion-exchange capability of LDH facilitates the substitution of native I^(-)with NO_(3)^(-),forming NO_(3)^(-)-MgAl LDH and simultaneously generating I_(3)^(-)/I^(-)redox mediators in electrolyte.This substitution not only achieves the dissolution of LiNO_(3),serving as a sustainable nitrogen source to optimize SEI components,but also enables the extracted I_(3)^(-)/I^(-)redox couple to react spontaneously with inactive Li,remarkably enhancing the coulombic efficiency.Consequently,the engineered electrolyte significantly extends the lifespan of Li||LiFePO4,Li||NCM,and Li@Cu||LiFePO4 cells.The unique architecture of LDH can precisely control the storage and release of NO_(3)^(-)and I^(-),offering a transformative electrolyte design framework for next-generation batteries by integrating two-dimensional material properties with electrochemical mechanisms.
