Layered double hydroxides(LDHs),a class of anionic clays consisting of brucite-like host layers and interlayer anions,have been widely investigated in the last decade due to their promising applications in many areas ...Layered double hydroxides(LDHs),a class of anionic clays consisting of brucite-like host layers and interlayer anions,have been widely investigated in the last decade due to their promising applications in many areas such as catalysis,ion separation and adsorption.Owing to the highly tunable compositi on and uniform distribution of metal cations in the brucite-like layers,as well as the facile exchangeability of intercalated anions,LDHs can be modified and functionalized to form various nanostructures/composites through versatile processes such as anion intercalation and exfoliation,decoration of nanoparticles,selfassembly with other two-dimensional(2D)materials,and controlled growth on conductive supports(e.g.,nanowire arrays,nano tubes,3D foams).In this article,we briefly review the recent advances on both the LDH nano structures and functionalized composites toward the applications in energy conversion,especially for water oxidation.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
A facile biomolecule-assisted hydrothermal route followed by calcination has been employed for the preparation of monoclinic yttrium oxysulfate hollow spheres doped with other rare-earth ions （Yb3＋ and Eu3＋ or Er3...A facile biomolecule-assisted hydrothermal route followed by calcination has been employed for the preparation of monoclinic yttrium oxysulfate hollow spheres doped with other rare-earth ions （Yb3＋ and Eu3＋ or Er3＋）. The formation of hollow spheres may involve Ostwald ripening. The resulting hybrid materials were used for upconversion applications. The host crystal structure allows the easy co-doping of two different rare-earth metal ions without significantly changing the host lattice. The luminescent properties were affected by the ratio and concentration of dopant rare-earth metal ions due to energy transfer and the symmetry of the crystal field. The type of luminescent center and the crystallinity of samples were also shown to have a significant influence on the optical properties of the as-prepared products.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.21505050,51672109)the Dispatch of Faculty Abroad of the University of Jinan+2 种基金the Natural Science Foundation of Shandong Province(Grant No.ZR2016FM30)supported in part by the WPI-MANA,Ministry of Education,Culture,Sports,Science and Technology,Japansupport from JSPS KAKENNHI(18H03869)
文摘Layered double hydroxides(LDHs),a class of anionic clays consisting of brucite-like host layers and interlayer anions,have been widely investigated in the last decade due to their promising applications in many areas such as catalysis,ion separation and adsorption.Owing to the highly tunable compositi on and uniform distribution of metal cations in the brucite-like layers,as well as the facile exchangeability of intercalated anions,LDHs can be modified and functionalized to form various nanostructures/composites through versatile processes such as anion intercalation and exfoliation,decoration of nanoparticles,selfassembly with other two-dimensional(2D)materials,and controlled growth on conductive supports(e.g.,nanowire arrays,nano tubes,3D foams).In this article,we briefly review the recent advances on both the LDH nano structures and functionalized composites toward the applications in energy conversion,especially for water oxidation.
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.
文摘A facile biomolecule-assisted hydrothermal route followed by calcination has been employed for the preparation of monoclinic yttrium oxysulfate hollow spheres doped with other rare-earth ions （Yb3＋ and Eu3＋ or Er3＋）. The formation of hollow spheres may involve Ostwald ripening. The resulting hybrid materials were used for upconversion applications. The host crystal structure allows the easy co-doping of two different rare-earth metal ions without significantly changing the host lattice. The luminescent properties were affected by the ratio and concentration of dopant rare-earth metal ions due to energy transfer and the symmetry of the crystal field. The type of luminescent center and the crystallinity of samples were also shown to have a significant influence on the optical properties of the as-prepared products.
