Single-ion conductors based on covalent organic frameworks(COFs)have garnered attention as a potential alternative to currently prevalent inorganic ion conductors owing to their structural uniqueness and chemical ***,...
详细信息
Single-ion conductors based on covalent organic frameworks(COFs)have garnered attention as a potential alternative to currently prevalent inorganic ion conductors owing to their structural uniqueness and chemical ***,the sluggish Li+conduction has hindered their practical ***,we present a class of solvent-free COF single-ion conductors(Li-COF@P)based on weak ion-dipole interaction as opposed to traditional strong ion-ion *** ion(Li+from the COF)-dipole(oxygen from poly(ethylene glycol)diacrylate embedded in the COF pores)interaction in the Li-COF@P promotes ion dissociation and Li+migration via directional ionic *** by this single-ion transport behavior,the Li-COF@P enables reversible Li plating/stripping on Li-metal electrodes and stable cycling performance(88.3%after 2000 cycles)in organic batteries(Li metal anode||5,5’-dimethyl-2,2’-bis-p-benzoquinone(Me2BBQ)cathode)under ambient operating conditions,highlighting the electrochemical viability of the Li-COF@P for all-solid-state organic batteries.
Cyano substitution is vital to the molecular design of polymer semiconductors toward highly efficient organic solar ***,how regioselectivity impacts relevant optoelectronic properties in cyano-substituted bithiophene ...
详细信息
Cyano substitution is vital to the molecular design of polymer semiconductors toward highly efficient organic solar ***,how regioselectivity impacts relevant optoelectronic properties in cyano-substituted bithiophene systems remain poorly *** regioisomeric cyano-functionalized dialkoxybithiophenes BT_(HH),BT_(HT),and BT_(TT) with headto-head,head-to-tail,and tail-to-tail linkage,respectively,were synthesized and characterized in this *** resulting polymer semiconductors(PBDTBTs)based on these building blocks were prepared *** regiochemistry and property relationships of PBDTBTs were investigated in *** BTHH moiety has a higher torsional barrier than the analogs BT_(HT) and BT_(TT),and the regiochemistry of dialkoxybithiophenes leads to fine modulation in the optoelectronic properties of these polymers,such as optical absorption,band gap,and energy levels of frontier molecular *** field-effect transistors based on PBDTBT_(HH) had higher hole mobility(4.4×10^(-3) cm^(2)/(V·s))than those(ca.10^(-4) cm^(2)/(V·s))of the other two polymer *** different short-circuit current densities and fill factors were obtained in polymer solar cells using PBDTBTs as the electron *** difference was probed in greater detail by performing space-charge-limited current mobility,thin-film morphology,and transient photocurrent/photovoltage *** findings highlight that the BTHH unit is a promising building block for the construction of polymer donors for highperformance organic photovoltaic cells.
In this work, we experimentally investigate the anti-ferroelectric behavior of Hf 1-x Zr x O 2 (HZO) films, depending on the film thickness and Zr content. It was found that the orthorhombic-I phase is the fundamental...
详细信息
The emerging two-dimensional(2D)materials,MXenes,play an important role in various fields of energy storage and exhibit excellent electrochemical ***,we prepared few-layered MXenes(F-Ti_(3)C_(2)T_(x))and loaded Te on ...
详细信息
The emerging two-dimensional(2D)materials,MXenes,play an important role in various fields of energy storage and exhibit excellent electrochemical ***,we prepared few-layered MXenes(F-Ti_(3)C_(2)T_(x))and loaded Te on the surface of F-Ti_(3)C_(2)T_(x) by using a simple hightemperature evaporation *** addition,the electrochemical performance of the aluminum battery with F-Ti_(3)C_(2)T_(x) as support material was *** initial charge/discharge specific capacities are 987/1096mAh g^(-1)at 0.2Ag^(-1).An obvious discharge voltage plateau of about 1.3V appears at various current *** specific capacity is about 258mAh g^(-1)with MXenes@Te as the active material in the aluminum battery,which benefits from the excellent electronic conductivity of the MXenes and their 2D layered *** functional theory calculations were carried out to explore the ***_(3)C_(2)O_(2)@Te is more inclined to adsorb[AlCl_(4)]^(-) than Ti_(3)C_(2)O_(2).Furthermore,the valence change behavior of element Te was studied by using thermodynamic calculation(FactSage 7.1).X-ray photoelectron spectroscopy results show that when the battery is fully charged to 2.4V element Te and Ti ions(Ti^(3+),Ti^(2+))are oxidized to Te^(4+)and Ti^(4+).In contrast to the charging process,the high-valence Te^(4+)and Ti^(4+)are reduced again during *** Te is reduced to lower-valence Te^(2-)when the discharge voltage is lower than 0.6 V,and a higher charge voltage(2.56 V)is required for Te to be oxidized to Te^(6+).
After recent years of tumor treatment research, scientists gradually found that immunotherapy has the best application prospect among various treatment methods. Immunotherapy can be achieved through the external adjus...
详细信息
One of the important issues with the scandate cathode is the mechanism by which Sc works on the cathode surface. A surface Sc-rich dispenser cathode was prepared via the vacuum evaporation method to clarify the role o...
详细信息
Multi-metallic nanoparticles have been proven to be an efficient photothermal conversion material, for which the optical absorption can be broadened through the interband transitions（IBTs）, but it remains a challeng...
详细信息
Multi-metallic nanoparticles have been proven to be an efficient photothermal conversion material, for which the optical absorption can be broadened through the interband transitions（IBTs）, but it remains a challenge due to the strong immiscibility among the repelling combinations. Here, assisted by an extremely high evaporation temperature, ultra-fast cooling and vapor-pressure strategy, the arc-discharged plasma method was employed to synthesize ultra-mixed multi-metallic nanoparticles composed of 21 elements（FeCoNiCrYTiVCuAlNbMoTaWZnCdPbBiAgInMnSn）, in which the strongly repelling combinations were uniformly distributed. Due to the reinforced lattice distortion effect and excellent IBTs, the nanoparticles can realize an average absorption of >92% in the entire solar spectrum（250 to 2500 nm）. In particular, the 21-element nanoparticles achieve a considerably high solar steam efficiency of nearly 99%under one solar irradiation, with a water evaporation rate of 2.42 kg m-2h-1, demonstrating a highly efficient photothermal conversion performance. The present approach creates a new strategy for uniformly mixing multi-metallic elements for exploring their unknown properties and various applications.
Water splitting has received more and more attention because of its huge potential to generate clean and renewable *** highly active and durable oxygen evolution reaction(OER)catalysts play a decisive factor in achiev...
详细信息
Water splitting has received more and more attention because of its huge potential to generate clean and renewable *** highly active and durable oxygen evolution reaction(OER)catalysts play a decisive factor in achieving efficient water *** identification of authentic active origin under the service conditions can prompt a more reasonable design of catalysts together with well-confined micro-/nano-structures to boost the efficiency of water ***,Fe,Co,and Ni ternary transition metal dichalcogenide(FCND)nanorod arrays on Ni foam are purposely designed as an active and stable low-cost OER pre-catalyst for the electrolysis of water in alkaline *** optimized FCND catalyst demonstrated a lower overpotential than the binary and unary counterparts,and a 27-fold rise in kinetic current density at the overpotential of 300 m V compared to the nickel dichalcogenide *** spectra and other structural characterizations at different potentials reveal that the in-situ surface self-reconstruction from FCND to ternary transition metal oxyhydroxides(FCNOH)on catalyst surfaces initiated at about 1.5 V,which is identified as the origin of OER *** surface selfreconstruction towards FCNOH also enables excellent stability,without fading upon the test for 50 h.
The dendrite and corrosion issues still remain for zinc *** modification of anodes has been widely used for stabilizing zinc ***,it is still quite challenging for such modification to simultaneously suppress zinc dend...
详细信息
The dendrite and corrosion issues still remain for zinc *** modification of anodes has been widely used for stabilizing zinc ***,it is still quite challenging for such modification to simultaneously suppress zinc dendrites and corrosion ***,we propose a new strategy of buried interfaceengineering to effectively stabilize Zn anodes,in which a zincophilic Sn layer is buried by a corrosion-resistant ZnS layer(SZS).The buried Sn layer has a strong adsorption energy towards Zn atoms,which accelerates the nucleation of Zn atoms and induces smooth ***,the outer ZnS layer protects the newly deposited zinc layer from the corrosion by the *** a result,the SZS@Zn symmetric cell demonstrates stable cycling for over 280 h compared to Bare Zn(41 h)at a high current of 10 mA cm^(-2)and a high areal capacity of 10 mAh cm^(-2).Besides,SZS@Zn//MnO2 full cells also achieve enhanced long-term cycling stability of 63.6%for 1000 cycles at a high rate of 10 C,compared to Bare Zn(47.2%).This work provides a new strategy of buried interface for the rational design of highly stable metal anodes for other metal batteries.
In this study, B4C–TiB2 ceramics were prepared via reactive sintering using B4C–Ti as the raw material. By investigating the sintering curve, microstructures, and mechanical properties at different sintering tempera...
详细信息
暂无评论