查看更多>>摘要：Oxygen evolution reaction(OER)is a kineti-cally harsh four-electron anode reaction that requires a large overpotential to provide current and is of great importance in renewable electrochemical technique.Ir/Ru-based perovskite oxides hold great significance for appli-cation as OER electrocatalysts,due to that their multi-metal-oxide forms can reduce the use of noble metals,and their compositional tunability can modulate the electronic structure and optimize OER performance.However,high operating potentials and corrosive environments pose a serious challenge to the development of durable Ir-based and Ru-based perovskite electrocatalysts.Tremendous efforts have been dedicated to improving the Ir/Ru-based perovskite activity to enhance the efficiency;however,progress in improving the durability of Ir/Ru-based per-ovskite electrocatalysts has been rather limited.In this review,the recent research progress of Ir/Ru-based per-ovskites is reviewed from the perspective of heteroatom doping,structural modulation,and formation of heterostructures.The dissolution mechanism studies of Ir/Ru and experimental attempts to improve the durability of Ir/Ru-based perovskite electrocatalysts are discussed.Challenges and outlooks for further developing Ru-and Ir-based perovskite oxygen electrocatalysts are also pre-sented.
查看更多>>摘要：It is highly desirable to seek green and sus-tainable technologies,such as employing photothermal effects to drive energy catalysis processes to address the high energy demand and associated environmental impacts induced by the current methods.The photothermocatalysis process is an emerging research area with great potential in efficiently converting solar energy through various cat-alytic reactions.However,achieving simultaneously high conversion efficiency,cyclability,and durability is still a daunting challenge.Thus,tremendous work is still needed to enhance solar photothermal catalytic conversion and promote its large-scale applications.This review developed the principles of coupling solar photon and thermal fields underlying the photothermal effect,exploration of efficient nanocatalysts,development of optofluidic reactor model,and photothermal synergistic-driven CO2 reduction mech-anisms.The ultimate goal was to provide an effective approach that can effectively convert solar energy into photocarriers/hot-electrons and heat,and importantly,can couple them to regulate catalysis reaction pathways toward the production of value-added fuel and chemical energy.
查看更多>>摘要：As a new type of green battery system,aqueous zinc-ion batteries(AZIBs)have gradually become a research hotspot due to their low cost,high safety,excel-lent stability,high theoretical capacity(820 mAh·g-1)of zinc anode,and low redox potential(-0.76 V vs.standard hydrogen electrode(SHE)).AZIBs have been expected to be an alternative to lithium-ion batteries for large-scale commercial energy storage applications.Unfortunately,they are facing thorny issues such as degradation of cycling performance,zinc dendrites,and side reactions.At the same time,these problems cause short cycling life of bat-teries,thus severely limiting their commercial application.In recent years,many more researches have been con-ducted on the modification of anode and cathode materials of AZIBs,but there is a lack of in-depth discussion on the characteristics and mechanism of electrolyte additives.In this review,we will make a systematic summary of the current problems with two electrodes in AZIBs,as well as the types and functions of electrolyte additives.Moreover,we further systematically describe the modulation mecha-nism of electrolyte additives in the performance of the cathode and anode.The prospects and development directions of additive modulation strategies for AZIBs electrolytes are prospected.
查看更多>>摘要：Polarized-sensitive image sensors are a kind of photodetector with great development potential due to their enhanced ability to detect and identify the target objects from the aspect of spatial,spectral and polarized infor-mation.Recently,low-dimensional anisotropic materials with inherent anisotropic properties,ultrathin thickness,tunable bandgap and feasible integration with comple-mentary metal oxide semiconductor(CMOS)fabrication processes have attracted great interest for their facilitation of polarized photodetector devices miniaturization.Maximizing the polarized detection performance of low-dimensional materials to satisfy realistic needs stimulates the exploration of modulation of anisotropic properties.In this review,we comprehensively introduce the latest research progress in modulating the optical and optoelec-tronic anisotropy characteristics of low-dimensional mate-rials.The strategy of anisotropy regulation through crystal structure engineering and coupling system is discussed emphatically.Then,the latest progress in image recogni-tion applications using anisotropic low-dimensional mate-rials is reviewed in detail.Finally,we summarize the challenge and propose future opportunities in the practical application of polarized-sensitive imaging photodetectors based on low-dimensional anisotropic materials.
查看更多>>摘要：The alloy-type material Sb is widely used in the anode materials of lithium-ion batteries(LIBs)due to its high theoretical specific capacity.However,its serious volume expansion problem during alloying/dealloying of Li+limits its practical application.In this work,C-Sb composite was constructed as anode material of LIBs by electrospinning route for the first time,Sb was introduced into the polyacrylonitrile-based hard carbon and coal tar pitch-based soft carbon composite amorphous carbon fiber with a diameter of 300-600 nm,which realized high cycling stability.The C-Sb-2(the mass ratio of polyacry-lonitrile to Sb source is 1∶2)electrode displayed charge capacities of 1098.5,930.3,841.7,753.5,643.9 and 545.8 mAh·g-1 at 0.1,0.2,0.3,0.5,1 and 2 A·g-1,respectively.And when the current density returned to 0.1 A·g-1,the charge capacity was 939.3 mAh·g-1,revealing good stability and reversibility.The introduction of Sb into the amorphous carbon improved its conductivity and addressed the volume expansion issue of high specific capacity Sb during charge/discharge.Ex-situ XRD analysis confirmed the high reversibility of the C-Sb-2 during charging and discharging.Density functional theory(DFT)calculations revealed the gradual enhancement of the interface inter-action between SbxLiy and amorphous carbon(AMC)with increasing lithium content,contributing to the anchoring of alloy nanoparticles on the AMC surface and buffering the volume change of the alloy.Moreover,the gradual lithia-tion of Sb facilitated the electron transfer from SbxLiy to AMC.These findings hold promise for designing lithium storage materials with exceptional performance,high-lighting the potential of C-Sb composites as anode mate-rials for efficient next-generation lithium storage.
查看更多>>摘要：Li3PO4@Li0.99K0.01Ni0.83Co0.11Mn0.06O2(NCM-KP)cathode powders are synthesized via K+dop-ing in calcination processes and H3PO4 coating in sol-gel processes.K+precisely enters into the lattice to widen the(003)plane to 0.4746 nm with a lower cationic disordered degree of 1.87％.Moreover,the surface residual lithium salts are treated by H3PO4 to generate a uniform Li3PO4 coating layer of approximately 11.41 nm,which com-pletely covers on the surface of secondary spherical parti-cles to improve the interfacial stability.At 25 ℃,the NCM-KP electrode delivers a discharge specific capacity of 148.9 mAh·g-1 with a remarkable capacity retention ratio of 84.1％after 200 cycles at 1.0C and retains a high reversible specific capacity of 154.4 mAh·g-1 at 5.0C.Even at 1.0C and 60 ℃,it can maintain a reversible dis-charge specific capacity of 114.6 mAh·g-1 with 0.21％of capacity decay per cycle after 200 cycles,which is sig-nificantly lower than 0.40％for the pristine NCM powders.Importantly,the charge transfer resistance of 238.89 Ω for the NCM-KP electrode is significantly lower than 947.41 Ω for the pristine NCM one by restricting the interfacial side reactions.Therefore,combining K+doping and Li3PO4 coating is an effective strategy to enable the significant improvement of the electrochemical property of high-nickel cathode materials,which may be mainly attributed to the widened diffusion pathway and the formed Li3PO4 protective layer,thus promoting Li+diffusion rate and preventing the erosion of HF.
查看更多>>摘要：Two-dimensional MoSe2 is a promising candi-date for lithium-ion battery anodes.However,its conduc-tivity and lithium storage volumetric effect still need to be optimized.In this work,W-doped MoSe2/rGO paper-like microspheres are successfully prepared through ultrasonic spray pyrolysis,achieving optimization at both the microstructure and mesostructure to enhance the lithium storage performance of the material.Firstly,by utilizing the similar two-dimensional structure between MoSe2 and rGO,self-assembly is achieved through spray pyrolysis,resulting in a well-defined van der Waals heterostructure at the interface on the microscale,enhancing the electron and ion transfer capability of the composite.Secondly,the mesoscale paper-like microsphere morphology provides additional volume expansion buffering space.Moreover,W-doping not only increases the interlayer spacing of MoSe2(0.73 nm),thereby reducing the diffusion resistance of Li+,but also allow for the modulation of the energy band structure of the material.Density functional theory(DFT)calculations confirm that W-doped MoSe2/rGO exhibits the narrowest bandgap(0.892 eV).Therefore,the composite demonstrates excellent lithium storage perfor-mance,maintaining a specific capacity of 732.9 mAh·g-1 after 300 cycles at a current density of 1 A·g-1.
查看更多>>摘要：Sn-based metal organic complexes with coor-dination bonds,multi-active sites,and high theoretical capacity have attracted much attention as promising anodes for lithium ion batteries.However,the low electrical con-ductivity and huge volume changes restricted their elec-trochemical stability and practical utilization.Herein,Sn-based anode with superior electrochemical performance,including a high reversible capacity of 1050.1 mAh·g-1 at 2 A·g-1 and a stable capacity of 1105.5 mAh·g-1 after 500 cycles at 1 A·g-1,was fabricated via a low-temperature calcination strategy from Sn metal organic complexes.The low-temperature calcination process regulates Sn-O bond and prevents the agglomeration of SnO2,generating highly dispersed SnO2 decorated metal organic complexes and providing sufficient active sites for ion storage.Ex situ characterizations expound that the undecomposed Sn-based metal organic complexes could be transformed into SnO2 during lithiation and delithiation,which enhances the electrical conductivity and induces a strong pseudo-ca-pacitive behavior,accelerating the electrochemical kinet-ics;the multiple solid electrolyte interface with inflexible LiF and flexible ROCO2Li buffers the volume variation of the electrode,resulting in its high electrochemical stability.This work provides a simple strategy for preparing excel-lent Sn-based anodes from metal organic complexes and reveals the lithium storage mechanism of the prepared Sn-based anode.
查看更多>>摘要：Aqueous zinc-ion batteries(AZIBs)have emerged as a promising high-efficiency energy storage system due to the high energy density,low-cost and envi-ronmental friendliness.However,the practical application of AZIBs is severely restricted by the challenges faced by the Zn anode,which include uncontrollable dendrite growth,corrosion and hydrogen evolution reaction.Herein,a simple and convenient physical vapor deposition(PVD)method is reported for fabricating uniform graphite as a protection layer on the surface of Zn anode.The high conductivity graphite layer on Zn anode(denoted as Zn@C)not only benefits the uniform distribution of the electric field,but also provides numerous Zn nucleation sites to regulate and navigate Zn-ion stripping/plating behaviors.Additionally,the graphite layer with a poor catalytic activity endows the Zn@C anode with a highly suppressed hydrogen evolution.Consequently,a hydrogen and dendrite free anode is achieved with artificial anticat-alytic carbon layer on Zn anode,exhibiting a high reversibility and excellent cycling stability over 2600 h at the current density of 5 mA.cm-2 with a capacity of 2.5 mAh.cm-2 and longtime cycling stability for assembled full cells.This work strategically designs the properties of the artificial interface layer to effectively address various challenges simultaneously,which presents insights for the future development of high-performance rechargeable AZIBs.
查看更多>>摘要：Perovskite oxides with diverse composition and structure have exhibited grand advances in boosting the oxygen reduction and evolution reaction(ORR/OER),which are essential for the reversible protonic ceramic electrochemical cell(R-PCEC)toward the sustainable hydrogen production and utilization.However,enhance-ment of their activity and stability remains challenging.Herein,we develop the Ta-regulated BaCo0.7Fe0.3O3-δperovskite oxygen electrode(Ba(Co0.7Fe0.3)1-xTaxO3-δ)with abundant oxygen defects and achieve the simultane-ous enhancement in the electrocatalytic activity and sta-bility toward ORR and OER.As-fabricated R-PCEC with Ba(Co0.7Fe0.3)0.9Ta0.1O3-δ(BCFT10)oxygen electrode performs high power density of 1.47 W·cm-2 at 650 ℃ in fuel cell mode,and the current density is up to-2.11 A.cm-2 at 1.4 V at 650 ℃ in electrolysis mode,as well as the good stability in both the fuel cell and elec-trolysis modes.Importantly,the cell also demonstrates a stable cycling operation between fuel cell and electrolysis mode,suggesting a great potential of BCFT10 as oxygen electrode material for R-PCECs.
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