查看更多>>摘要：Perovskite solar cells(PSCs)have emerged as a promising photovoltaic technology because of their high light absorption coefficient,long carrier diffusion distance,and tunable bandgap.However,PSCs face challenges such as hysteresis effects and stability issues.In this study,we introduced a novel approach to improve film crystallization by leveraging 4-tert-butylpyridine(TBP)molecules,thereby enhancing the performance and stability of PSCs.Our findings demonstrate the effective removal of PbI2 from the perovskite surface through strong coordination with TBP molecules.Additionally,by carefully adjusting the concentration of the TBP solution,we achieved enhanced film crystallinity without disrupting the perovskite structure.The TBP-treated perovskite films exhibit a low defect density,improved crys-tallinity,and improved carrier lifetime.As a result,the PSCs manufactured with TBP treatment achieve power conversion efficiency(PCE)exceeding 24％.Moreover,we obtained the PCE of 21.39％for the 12.25 cm2 module.
Gyeong Ho HanJung Yong SeoMinji KangMyung-gi Seo...
8-15页
查看更多>>摘要：Cu catalysts can convert CO2 through an electrochemical reduction reaction into a variety of useful carbon-based products.However,this capability provides an obstacle to increasing the selectivity for a single product.Herein,we report a simple fabrication method for a Cu-Pd alloy catalyst for use in a mem-brane electrode assembly(MEA)-based CO2 electrolyzer for the electrochemical CO2 reduction reaction(ECRR)with high selectivity for CO production.When the composition of the Cu-Pd alloy catalyst was fabricated at 6:4,the selectivity for CO increased and the production of multi-carbon compounds and hydrogen is suppressed.Introducing a Cu-Pd alloy catalyst with 6:4 ratio as the cathode of the MEA-based CO2 electrolyzer showed a CO faradaic efficiency of 92.8％at 2.4 Vcell.We assumed that these results contributed from the crystal planes on the surface of the Cu-Pd alloy.The phases of the Cu-Pd alloy cat-alyst were partially separated through annealing to fabricate a catalyst with high selectivity for CO at low voltage and C2H4 at high voltage.The results of CO-stripping testing confirmed that when Cu partially separates from the lattice of the Cu-Pd alloy,the desorption of*CO is suppressed,suggesting that C-C coupling reaction is favored.
查看更多>>摘要：Free-standing silicon anodes with high proportion of active materials have aroused great attention;how-ever,the mechanical stability and electrochemical performance are severely suppressed.Herein,to resolve the appeal issues,a free-standing anode with a"corrugated paper"shape on micro-scale and a topological crosslinking network on the submicron and nano-scale is designed.Essentially,an integrated three-dimensional electrode structure is constructed based on robust carbon nanotubes network with firmly anchored SiNPs via forming interlocking junctions.In which,the hierarchical interlocking structure is achieved by directional induction of the binder,which ensures well integration during cycling so that significantly enhances mechanical stability as well as electronic and ionic conductivity of electrodes.Benefiting from it,this anode exhibits outstanding performance under harsh service conditions including high Si loading,ultrahigh areal capacity(33.2 mA h cm-2),and high/low temperatures(-15-60 ℃),which significantly extends its practical prospect.Furthermore,the optimization mechanism of this elec-trode is explored to verify the crack-healing and structure-integration maintaining along cycling via a unique self-stabilization process.Thus,from both the fundamental and engineering views,this strategy offers a promising path to produce high-performance free-standing electrodes for flexible device applica-tions especially facing volume effect challenges.
查看更多>>摘要：Recycling graphite anode from spent lithium-ion batteries(SLIBs)is regarded as a crucial approach to promoting sustainable energy storage industry.However,the recycled graphite(RG)generally presents degraded structure and performance.Herein,the residual fluoride self-activated effect is proposed for the upgraded utilization of RG.Simple and low-energy water immersion treatment not only widens the interlayer spacing,but also retains appropriate fluoride on the surface of RG.Theoretical analysis and experiments demonstrate that the residual fluoride can optimize Li+migration and deposition kinet-ics,resulting in better Li+intercalation/deintercalation in the interlayer and more stable Li metal plating/stripping on the surface of RG.As a result,the designed LFP||RG full cells achieve ultrahigh reversibility(～100％Coulombic efficiency),high capacity retention(67％after 200 cycles,0.85 N/P ratio),and com-mendable adaptability(stable cycling without short-circuiting,0.15 N/P ratio).The energy density is improved from 334 Wh kg-1 of 1.1 N/P ratio to 367 Wh kg-1 of 0.85 N/P ratio(total mass based on cath-ode and anode).The exploration of RG by residual fluoride self-activated effect achieves upgraded utiliza-tion beyond fresh commercial graphite and highlights a new strategy for efficient reuse of SLIBs.
查看更多>>摘要：Lithium iron phosphate batteries have been increasingly utilized in recent years because their higher safety performance can improve the increasing trend of recurring thermal runaway accidents.However,the safety performance and mechanism of high-capacity lithium iron phosphate batteries under internal short-circuit challenges remain to be explored.This work analyzes the thermal runaway evolution of high-capacity LiFePO4 batteries under different internal heat transfer modes,which are con-trolled by different penetration modes.Two penetration cases involving complete penetration and incomplete penetration were detected during the test,and two modes were performed incorporating nails that either remained or were removed after penetration to comprehensively reveal the thermal run-away mechanism.A theoretical model of microcircuits and internal heat conduction is also established.The results indicated three thermal runaway evolution processes for high-capacity batteries,which cor-responded to the experimental results of thermal equilibrium,single thermal runaway,and two thermal runaway events.The difference in heat distribution in the three phenomena is determined based on the microstructure and material structure near the pinhole.By controlling the heat dissipation conditions,the time interval between two thermal runaway events can be delayed from 558 to 1417 s,accompanied by a decrease in the concentration of in-situ gas production during the second thermal runaway event.
查看更多>>摘要：Photocatalytic H2 evolution from seawater splitting presents a promising approach to tackle the fossil energy crisis and mitigate carbon emission due to the abundant source of seawater and sunlight on the earth.However,the development of efficient photocatalysts for seawater splitting remains a formid-able challenge.Herein,a 2D/2D ZnIn2S4/WO3(ZIS/WO3)heterojunction nanostructure is fabricated to efficiently separate the photoinduced carriers by steering electron transfer from the conduction band minimum of WO3 to the valence band maximum of ZIS via constructing internal electric field.Subsequently,plasmonic Au nanoparticles(NPs)as a novel photosensitizer and a reduction cocatalyst are anchored on ZIS/WO3 surface to further enhance the optical absorption of ZIS/WO3 heterojunction and accelerate the catalytic conversion.The obtained Au/ZIS/WO3 photocatalyst exhibits an outstanding H2 evolution rate of 2610.6 or 3566.3 μmol g-1 h-1 from seawater splitting under visible or full-spectrum light irradiation,respectively.These rates represent an impressive increase of approximately 7.3-and 6.6-fold compared to those of ZIS under the illumination of the same light source.The unique 2D/2D struc-ture,internal electric field,and plasmonic metal modification together boost the photocatalytic H2 evo-lution rate of Au/ZIS/WO3,making it even comparable to H2 evolution from pure water splitting.The present work sheds light on the development of efficient photocatalysts for seawater splitting.
查看更多>>摘要：Wide-bandgap(WBG)perovskite solar cells(PSCs)play a fundamental role in perovskite-based tandem solar cells.However,the efficiency of WBG PSCs is limited by significant open-circuit voltage losses,which are primarily caused by surface defects.In this study,we present a novel method for modifying surfaces using the multifunctional S-ethylisothiourea hydrobromide(SEBr),which can passivate both Pb-I and FA-I terminated surfaces.Moreover,the SEBr upshifted the Fermi level at the perovskite inter-face,thereby promoting carrier collection.This proposed method was effective for both 1.67 and 1.77 eV WBG PSCs,achieving power conversion efficiencies(PCEs)of 22.47％and 19.90％,respectively,with Voc values of 1.28 and 1.33 V,along with improved film and device stability.With this advancement,we were able to fabricate monolithic all-perovskite tandem solar cells with a champion PCE of 27.10％.This research offers valuable insights for passivating the surface trap states of WBG perovskite through rational multifunctional molecular engineering.
查看更多>>摘要：Cathode materials that possess high output voltage,as well as those that can be mass-produced using facile techniques,are crucial for the advancement of aqueous zinc-ion battery(ZIBs)applications.Herein,we present for the first time a new porous K0.5VOPO4.1.5H2O polyanionic cathode(P-KVP)with high output voltage(above 1.2 V)that can be manufactured at room temperature using straightforward coprecipitation and etching techniques.The P-KVP cathode experiences anisotropic crystal plane expan-sion via a sequential solid-solution intercalation and phase conversion pathway throughout the Zn2+stor-age process,as confirmed by in-situ synchrotron X-ray diffraction and ex-situ X-ray photoelectron spectroscopy.Similar to other layered vanadium-based polyanionic materials,the P-KVP cathode experi-ences a progressive decline in voltage during the cycle,which is demonstrated to be caused by the irre-versible conversion into amorphous VOx.By introducing a new electrolyte containing Zn(OTF)2 to a mixed triethyl phosphate and water solution,it is possible to impede this irreversible conversion and obtain a high output voltage and longer cycle life by forming a P-rich cathode electrolyte interface layer.As a proof-of-concept,the flexible fiber-shaped ZIBs based on modified electrolyte woven into a fabric watch band can power an electronic watch,highlighting the application potential of P-KVP cathode.
查看更多>>摘要：Developing sustainable and clean energy sources(e.g.,solar,wind,and tide energy)is essential to achieve the goal of carbon neutrality.Due to the discontinuous and inconsistent nature of common clean energy sources,high-performance energy storage technologies are a critical part of achieving this target.Aqueous zinc metal batteries(AZMBs)with inherent safety,low cost,and competitive performance are regarded as one of the promising candidates for grid-scale energy storage.However,zinc metal anodes(ZMAs)with irreversible problems of dendrite growth,hydrogen evolution reaction,self-corrosion,and other side reactions have seri-ously hindered the development and commercialization of AZMBs.An increasing number of researchers are focusing on the stability of ZMAs,so assessing the effectiveness of existing research strategies is critical to the development of AZMBs.This review aims to provide a comprehensive overview of the fundamentals and challenges of AZMBs.Research strategies for interfacial modification of ZMAs are systematically presented.The features of artificial interfacial coating and in-situ interfacial coating of ZMAs are compared and dis-cussed in detail,as well as the effect of modified interfacial ZMA on the full-battery performance.Finally,per-spectives are provided on the problems and challenges of ZMAs.This review is expected to offer a constructive reference for the further development and commercialization of AZMBs.
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