Effective hydrogen storage capacity is a key factor for applications of solid-state hydrogen storage technology. In this work, V-based solid solution alloys were prepared and the effect of codoping Cr and the rare-earth Y element on the crystal microstructure and reversible hydrogen storage properties were investigated. The results revealed that the hydrogen absorption of Ti–V–Mn–Cr–Y alloys could exceed 90% of the maximum hydrogen capacity within 50 s at 6 MPa hydrogen pressure, and the alloy Ti0.9Y0.1V1.1Mn0.8Cr0.1 can absorb maximum 3.71 wt % hydrogen capacity, and the effective hydrogen capacity above 0.1 MPa can reach 2.53 wt % at 423 K. Furthermore, the dehydriding thermodynamic parameters revealed a significant tendency toward easier dehydrogenation with codoping of trans-metal and rare-earth metal elements.

The development of long-term stable Zn anodes capable of operating at high current densities and/or capacities remains a huge challenge. Herein, through the rapid potassium permanganate solution treatment and laser lithography, we have developed a gradient Zn anode (LLP@Treated Zn) with the insulating and hydrophobic passivated-layer at the top and conductive and hydrophilic fresh-zinc-layer at the bottom. This makes the passivation layer prevent the Zn anodes from corrosion and side reactions and induce the preferential deposition of Zn at the bottom of the microchannel without dendrite growth. As a consequence, the LLP@Treated Zn anodes exhibit a stable cycle life for over 700 h at 10 mA cm–2 and 5 mAh cm–2. Moreover, the Zn anodes with different surface morphologies (ring, lattice, etc.) could also be obtained by laser lithography, which proves the flexibility of the pulsed laser lithography strategy in the preparation of battery materials.

Aqueous Zn-based batteries deliver thousands of cycles at high rates but poor recyclability at low rates. Herein, we reveal that such illogical phenomenon is attributed to the reconstructed electrode/electrolyte interface...

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In this paper, we report the synthesis, crystal structure, photophysical properties, and electronic nature of a phosphorescent Cu(I) complex of [Cu(TBT)(POP)]BF 4 , where TBT and POP stand for 4,5,9,14-tetraaza-benzo[b]-triphenylene and bis(2-(diphenylphosphanyl)phenyl) ether, respectively. [Cu(TBT)(POP)]BF 4 renders a red phosphorescence peaking at 622 nm, with a long excited-state lifetime of 13.2 ls. Density functional calculation reveals that the emission comes from a triplet metal-to-ligandcharge-transfer excited state. We electrospun composite nanofibers of [Cu(TBT)(POP)]BF 4 and polystyrene, hoping to explore the possibility of replacing precious-metal-based oxygen sensors with cheap Cu-based ones. The finally obtained samples with average diameter of *700 nm exhibit a maximum sensitivity of 5.8 toward molecular oxygen with short response/recovery time (5/13 s) due to the large surface-area-to-volume ratio of nanofibrous membranes. No photobleaching is detected in these samples. All these results suggest that phosphorescent Cu(I) complexes doped nanofibrous membranes are promising candidates for low-cost and quick-response oxygen-sensing materials.