Novel C-BiOCl/Bi_(2)S_(3) composites are prepared by hydrothermal C doping in BiOCl and in-situ growth of Bi_(2)S_(3) on C-BiOCl.Compared with BiOCl,C-BiOCl has a larger exposed surface area and can effectively absorb...Novel C-BiOCl/Bi_(2)S_(3) composites are prepared by hydrothermal C doping in BiOCl and in-situ growth of Bi_(2)S_(3) on C-BiOCl.Compared with BiOCl,C-BiOCl has a larger exposed surface area and can effectively absorb visible light.The construction of a heterojunction in C-BiOCl/Bi_(2)S_(3) further promotes the separation and transfer of photogenerated carriers.With improved photoelectric properties,the optimized 5C-BiOCl/5Bi_(2)S_(3) is applied as a dual-functional composite for photoelectrochemical(PEC)detection and photocatalytic(PC)reduction of Cr(VI).The 5C-BiOCl/5Bi_(2)S_(3) shows a linear range of 0.02-80μM for PEC cathodic detection of Cr(VI)with a detection limit of 0.01628μM.Additionally,99.5%of Cr(VI)can be removed via absorption and PC reduction by 5C-BiOCl/5Bi_(2)S_(3),with the reduction rate constant(k)336 times higher than that of BiOCl.展开更多
The rational design of Prussian blue analogue(PBA) cathodes with bimetallic reaction centers represents a cornerstone strategy for high-energy sodium-ion batteries(SIBs),yet their electrochemical performa nce is inher...The rational design of Prussian blue analogue(PBA) cathodes with bimetallic reaction centers represents a cornerstone strategy for high-energy sodium-ion batteries(SIBs),yet their electrochemical performa nce is inherently limited by structural instability and sluggish kinetics.Herein,we propose a multielement co-doping strategy to achieve a holistic optimization of bimetallic Na_(2)Mn0_(.5)Fe_(0.5)[Fe(CN)_(6)](MFHCF) by substituting N-coordinated sites with Mg~Ⅱ,Co~Ⅱ,and Ni~Ⅱ.Specifically,the MgCoNi-MFHCF delivers a superior rate capability(145.9 and 85.3 mAh g^(-1) under 0.1 and 30 C,respectively),outstanding cycling stability(83.1% capacity retention over 1000 cycles),and high energy density(304.5 Wh kg^(-1) for the full cell).In situ/ex situ techniques and theoretical calculations reveal that the MgCoNi-MFHCF experiences a reversible tri-phase transition with mitigated volume contraction/expansion,which originates from the alleviation of the Jahn-Teller distortion.It is considered that the cation doping enhances redox reaction reversibility through stabilized transition-metal coordination environments while reducing bandgaps and lowering ionic diffusion energy barrier,leading to accelerated electrochemical kinetics.This study establishes a generalizable multielement engineering strategy for high-performance cathode materials with bimetallic reaction centers for SIBs.展开更多
基金supported by the National Natural Science Foundation of China(Nos.51901222,41827805)the CAS Pioneer Hundred Talents Program,and the Shandong Province Higher Educational Program for Introduction and Cultivation of Young Innovative Talents(2021).
文摘Novel C-BiOCl/Bi_(2)S_(3) composites are prepared by hydrothermal C doping in BiOCl and in-situ growth of Bi_(2)S_(3) on C-BiOCl.Compared with BiOCl,C-BiOCl has a larger exposed surface area and can effectively absorb visible light.The construction of a heterojunction in C-BiOCl/Bi_(2)S_(3) further promotes the separation and transfer of photogenerated carriers.With improved photoelectric properties,the optimized 5C-BiOCl/5Bi_(2)S_(3) is applied as a dual-functional composite for photoelectrochemical(PEC)detection and photocatalytic(PC)reduction of Cr(VI).The 5C-BiOCl/5Bi_(2)S_(3) shows a linear range of 0.02-80μM for PEC cathodic detection of Cr(VI)with a detection limit of 0.01628μM.Additionally,99.5%of Cr(VI)can be removed via absorption and PC reduction by 5C-BiOCl/5Bi_(2)S_(3),with the reduction rate constant(k)336 times higher than that of BiOCl.
基金jointly supported by the Science and Technology Program of Guangdong Province (Nos.2024A1515011310, 2023A1515011361,2020A1515010957)the National Natural Science Foundation of China (Nos.21974052,21875070)。
文摘The rational design of Prussian blue analogue(PBA) cathodes with bimetallic reaction centers represents a cornerstone strategy for high-energy sodium-ion batteries(SIBs),yet their electrochemical performa nce is inherently limited by structural instability and sluggish kinetics.Herein,we propose a multielement co-doping strategy to achieve a holistic optimization of bimetallic Na_(2)Mn0_(.5)Fe_(0.5)[Fe(CN)_(6)](MFHCF) by substituting N-coordinated sites with Mg~Ⅱ,Co~Ⅱ,and Ni~Ⅱ.Specifically,the MgCoNi-MFHCF delivers a superior rate capability(145.9 and 85.3 mAh g^(-1) under 0.1 and 30 C,respectively),outstanding cycling stability(83.1% capacity retention over 1000 cycles),and high energy density(304.5 Wh kg^(-1) for the full cell).In situ/ex situ techniques and theoretical calculations reveal that the MgCoNi-MFHCF experiences a reversible tri-phase transition with mitigated volume contraction/expansion,which originates from the alleviation of the Jahn-Teller distortion.It is considered that the cation doping enhances redox reaction reversibility through stabilized transition-metal coordination environments while reducing bandgaps and lowering ionic diffusion energy barrier,leading to accelerated electrochemical kinetics.This study establishes a generalizable multielement engineering strategy for high-performance cathode materials with bimetallic reaction centers for SIBs.
