Onion-like NiCo S particles with unique hollow structured shells are synthesized by a sequential ion-exchange strategy. With the structural and compositional advantages, these unique onion-like NiCo S particles exhibit enhanced electrochemical performance as an electrode material for hybrid supercapacitors.

Wearable and implantable bioelectronics are receiving a great deal of attention because they offer huge promise in personalized healthcare. Currently available bioelectronics generally rely on external aids to form an attachment to the human body, which leads to unstable performance in practical applications. Self‐adhesive bioelectronics are highly desirable for ameliorating these concerns by offering reliable and conformal contact with tissue, and stability and fidelity in the signal detection. However, achieving adequate and long‐term self‐adhesion to soft and wet biological tissues has been a daunting challenge. Recently, mussel‐inspired hydrogels have emerged as promising candidates for the design of self‐adhesive bioelectronics. In addition to self‐adhesiveness, the mussel‐inspired chemistry offers a unique pathway for integrating multiple functional properties to all‐in‐one bioelectronic devices, which have great implications for healthcare applications. In this report, the recent progress in the area of mussel‐inspired self‐adhesive bioelectronics is highlighted by specifically discussing: 1) adhesion mechanism of mussels, 2) mussel‐inspired hydrogels with long‐term and repeatable adhesion, 3) the recent advance in development of hydrogel bioelectronics by reconciling self‐adhesiveness and additional properties including conductivity, toughness, transparency, self‐healing, antibacterial properties, and tolerance to extreme environment, and 4) the challenges and prospects for the future design of the mussel‐inspired self‐adhesive bioelectronics.

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Heterogeneous oxidation of gas-phase SO 2 on different iron oxides was investigated in situ using a White cell coupled with Fourier transform infrared spectroscopy (FTIR) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The results revealed that adsorbed SO 2 could be oxidized on the surface of most iron oxides to form a surface sulfate species at ambient temperature. Additional support for this hypothesis was provided by X-ray photoelectron spectroscopy (XPS) measurements and ion chromatogram (IC) analysis. The spectroscopic results further revealed that the surface hydroxyl species on the iron oxides was the key reactant for this heterogeneous oxidation. Furthermore, the bidentate sulfate species were the predominant surface species with R-Fe 2 O 3 , R-FeOOH, and Fe 3 O 4 , while the monodentate surface Fe(III)sulfato complexes were available in the case of γ-Fe 2 O 3 . Using the BET area as the reactive surface area, the samples showed the varied reactivity in the order of R-FeSome preliminary experiments indicated a significant acceleration during SO 2 uptake on the surface of R-Fe 2 O 3 in the presence of oxygen. In contrast, no significant formation of sulfate was seen on the surface of R-Fe 2 O 3 prereduced by H 2 at 523 K at the absence of O 2 , suggesting that the concentration of adsorbed oxygen over catalyst surfaces may be the key factor contributing to the oxidizing activities. On the basis of these results, the atmospheric implications of these studies on SO 2 uptake on Fe-rich mineral aerosol were discussed.