State Key Laboratory of Functional Materials for Informatics

Conversion reaction enables Li/garnet interface to construct a kinetically stable interfacial layer for the homogeneous ions transport in all-solid-batteries.

We synthesized nitrogen-doped graphene quantum dots (N-GQDs) under a high temperature range of 800–1200 °C and high pressure of 4.0 GPa through a solid-to-solid process.

Understanding the interplay between surface chemistry, electronic structure, and reaction mechanism of the catalyst at the electrified solid/liquid interface will enable the design of more efficient materials systems for sustainable energy production.

We demonstrated that graphene oxide can be oxidized and cut into graphene quantum dots by hydroxyl radicals which is obtained by catalytic decomposition of hydrogen peroxide with a tungsten oxide nanowire catalyst.

A family of catalytic electrodes fabricated by insulating substrates of paper, cloth and sponge which bring dramatic advantages of high performance, low cost, light weight, eco-friendliness, flexibility, and simple fabrication, were developed.

N-GQDs with 80% PLQY are used as an EDS layer for γ-CsPbI₃ PSCs, and attained a high PCE of 16.02%.

We describe a new in operando approach for the investigation of heterogeneous processes at solid/liquid interfaces with elemental and chemical specificity which combines the preparation of thin liquid films using the meniscus method with standing wave ambient pressure X-ray photoelectron spectroscopy [Nemšák et al., Nat. Commun., 5, 5441 (2014)]. This technique provides information about the chemical composition across liquid/solid interfaces with sub-nanometer depth resolution and under realistic conditions of solution composition and concentration, pH, as well as electrical bias. In this article, we discuss the basics of the technique and present the first results of measurements on KOH/Ni interfaces.

support, especially the anatase crystal phase with abundant oxygen vacancies, can achieve the high performance for EtOH synthesis under moderate and practical conditions.

Flexible in-plane solid-state supercapacitor fabricated by CVD-grown metallic VSe₂nanosheets presents excellent mechanical stability and high energy density.

Abstract Li‐rich layered oxides (LLOs) suffer from rapid voltage decay and capacity fading, greatly hindering their applications as high‐energy cathode materials for Li‐ion batteries (LIBs), which are closely associated with irreversible structural transformation and lattice oxygen loss upon electrochemical cycling. A strategy of Al/Ti synergistic bulk doping is proposed to stabilize LLOs against structural degradations, yielding remarkable electrochemical performance including a minor voltage decay of 0.34 mV cycle −1 and a superior capacity retention of 89.7% over 500 cycles at 1C. The improved structural stability of Al/Ti codoped LLOs is well maintained after not only initial but also long cycles. This effect can be attributed to the cooperation of Al and Ti, with the former stabilizing the lattice oxygen by strong Al–O bonds and the latter improving the Li + conductivity by expanding the lattice. The facile bulk synergistic doping of LLOs paves avenues toward their application for high‐energy LIBs.

We report on the growth of single cubic-phase MgZnO thin films by reactive electron beam evaporation on sapphire substrates. A detailed theoretical procedure has been employed to analyse the transmission profile for information on composition non-uniformity, in addition to the exact determination of the band gap energy. The study of composition non-uniformity has been further extended to both the typically reported hexagonal and cubic MgZnO thin films. It is found that the composition non-uniformity strongly depends on the Mg content, which can be well explained by the ZnO–MgO phase diagram.

. The highest efficiency (17.62%) is achieved via decoration with 7% GQDs, which is an 8.2% enhancement with respect to a pure perovskite based device. Various analyses including electrochemical impedance spectroscopy, time-resolved photoluminescence decay and open-circuit voltage decay measurements are employed in investigating the mechanism behind the improvement in device performance. The findings reveal two important roles played by GQDs in promoting the performance of perovskite solar cells - that GQDs are conducive to facilitating electron extraction and can effectively passivate the electron traps at the perovskite grain boundaries.

Studies on the preparation and physical properties of phase-pure 1T′-MoS₂are still scarce although a 1T′ phase MX₂(M = Mo and W; X = Se and Te) has recently been reported to be a Weyl semimetal, a quantum spin Hall insulator, and a superconductor.

Homologous metal-free electrocatalysts grown on three-dimensional carbon networks are integrated for overall water splitting in acidic and alkaline media.

Mn-doped monoclinic β-(Ga_1−xMn_x)₂O₃ thin films were epitaxially grown on α-Al₂O₃ (0001) substrates by alternately depositing Ga₂O₃ and Mn layers using the laser molecular beam epitaxy technique.

O₃-based interface engineering dominates implementations of analog memory and synaptic simulation using reliable Pt/HfO₂/TiN RRAM.

A two-dimensional stanene nanomesh is proposed as a promising anode material for Na-ion batteries.

Ga14Sb86 film has been studied to explore its suitability as a novel active material for phase change memory application. With a crystallization temperature about 220 °C, Ga14Sb86 film has the activation energy of crystallization larger than 4.6 eV obtained both by nonisothermal and isothermal methods. This leads to an ultralong data retention, which is characterized by the temperature for ten years data retention at 162 °C. The reversible phase change can be realized by a pulse as short as 20 ns. Ga14Sb86-based cell shows a good endurance up to 3.2x105 SET-RESET cycles during endurance test.

A low-cost and catalyst-free two-step approach has been developed to produce ZnO nanotubes (ZNTs) by simple thermal oxidation of Zn nanowires under 20 Pa at a low temperature of 400 °C. The growth mechanism of ZNTs is discussed in detail. The formation of these tubular structures is closely linked to the oxidation pressure and temperature, which involves a process consisting of the deposition of Zn nanowires, cracking of the Zn nanowires and sublimation of the Zn cores, and subsequent oxidation to ZNTs. The optical properties were studied by using Raman and photoluminescence spectra, where a strong green emission related to the single ionized oxygen vacancy appears. The photocatalytic activity measurement indicates an enhanced photocatalytic activity of the prepared ZNTs due to their high surface-to-volume ratios and abundant oxygen vacancies near the surfaces of the ZNTs. This type of high surface area structural ZNTs could find promising potential for optoelectronic and environmental applications.

A submicron thick diboronic acid linked GOF/polyvinyl alcohol hybrid membrane was prepared for the first time. The uniform inter-spacing of the GOF membrane excludes the diffusion of large molecules based on a molecular sieving mechanism. It exhibits high stability and excellent sieving performance in solvent (≥C3) dehydration (SFs > 10,000).