A Ti3C2Tx MXene/rGO hybrid aerogel is applied for the first time as a free-standing polysulfide reservoir to inhibit the shuttle effect and improve the overall performance of Li–S batteries.
Due to the potential applications in optoelectronic memories, optical control of ferroelectric domain walls has emerged as an intriguing and important topic in modern solid-state physics. However, its device implementation in a single ferroelectric, such as conventional BaTiO 3 or PZT ceramics, still presents huge challenges in terms of the poor material conductivity and the energy mismatch between incident photons and ferroelectric switching. Here, using the generation of photocurrent in conductive α-In 2 Se 3 (a van der Waals ferroelectric) with a two-terminal planar architecture, the first demonstration of optical-engineered ferroelectric domain wall in a non-volatile manner for optoelectronic memory application is reported. The α-In 2 Se 3 device exhibits a large optical-writing and electrical-erasing (on/off) ratio of >10 4 , as well as multilevel current switching upon optical excitation. The narrow direct bandgap of the multilayer α-In 2 Se 3 ferroelectric endows the device with broadband optical-writing wavelengths greater than 900 nm. In addition, photonic synapses with approximate linear weight updates for neuromorphic computing are also achieved in the ferroelectric devices. This work represents a breakthrough toward technological applications of ferroelectric nanodomain engineering by light.
In recent years, it is urgent and challenging to fabricate highly sensitive and selective gas sensors for breath analyses. In this work, Sr-doped cubic In 2 O 3 /rhombohedral In 2 O 3 homojunction nanowires (NWs) are synthesized by one-step electrospun technology. The Sr doping alters the cubic phase of pure In 2 O 3 into the rhombohedral phase, which is verified by the high-resolution transmittance electron microscopy, X-ray diffraction, and Raman spectroscopy, and is attributable to the low cohesive energy as calculated by the density functional theory (DFT). As a proof-of-concept of fatty liver biomarker sensing, ethanol sensors are fabricated using the electrospun In 2 O 3 NWs. The results show that 8 wt % Sr-doped In 2 O 3 shows the highest ethanol sensing performance with a high response of 21−1 ppm, a high selectivity over other interfering gases such as methanol, acetone, formaldehyde, toluene, xylene, and benzene, a high stability measured in 6 weeks, and also a high resistance to high humidity of 80%. The outstanding ethanol sensing performance is attributable to the enhanced ethanol adsorption by Sr doping as calculated by DFT, the stable rhombohedral phase and the preferred (104) facet exposure, and the formed homojunctions favoring the electron transfer. All these results show the effective structural modification of In 2 O 3 by Sr doping, and also the great potency of the homojunction Sr-doped In 2 O 3 NWs for highly sensitive, selective, and stable breath ethanol sensing.
Novel ultrathin hollow carbon spheres with a nonporous shell are employed as polysulfide reservoirs to improve the overall performance of Li-S batteries.
A novel Janus Fe3C/N-CNF@RGO electrode was successfully constructed, which realizes the co-existence of chemical immobilization, catalytic ability, and physical barrier in 3D conductive networks, enabling robust cycling stability of Li–S battery
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