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We propose a facile and scalable in situ polymerization strategy to selectively introduce the active quinone-based components across the carbon nanotube (CNT) surface. It can be observed that the optimized poly(anthraquinonyl sulfide) (PAQS)/CNT composites exhibit excellent activity and selectivity with a H2O2 yield ratio of approximately 91% at 0.5 V (vs. RHE), together with satisfactory stability at 0.5 V over 20 h. The electrocatalytic performance is correlated with the synergistic effect between PAQS and CNTs. That is, PAQS grafted with abundant quinone groups facilitates the 2 e− ORR process to produce H2O2, and the conductive CNT scaffold is beneficial for the uniform distribution of PAQS and ensures the fast electron transport through the composites. [ABSTRACT FROM AUTHOR]

In this work, we report the first bioluminescent probe BP-PS for detecting H2Sn with high specificity and sensitivity. Owing to the bioluminescence imaging without requiring an excitation light source, tissue autofluorescence is eliminated and BP-PS shows a high signal-to-noise ratio. Moreover, BP-PS was successfully utilized to visualize endogenous H2Sn in live cells and a murine model of bacterial infection. [ABSTRACT FROM AUTHOR]

A bioluminescent probe, BP-HNO, which exhibits a turn-on response to nitroxyl with high sensitivity and selectivity, is reported for the first time in this work. BP-HNO is free from the interference of biological autofluorescence to afford a high signal-to-noise ratio for bioimaging, and was successfully applied to imaging nitroxyl in live cells and mice. [ABSTRACT FROM AUTHOR]

The monoradical cation 1˙+ and anion 1˙− based on tetracene were generated by one-electron oxidation and one-electron reduction of the bulky tetracene (1), respectively, which contain the largest π-fused skeletons reported to date. For monoradical species, 1˙+ and 1˙−, EPR spectra and DFT calculation results indicate the spin density delocalized over the whole molecules. Notably, in the solid state, 1˙+ and 1˙−, respectively, pack into (1˙+)n and (1˙−-K-crown)n, characterized by single-crystal X-ray diffraction studies. The intermolecular interactions of 1˙+ and 1˙− are, respectively, through van der Waals forces and exchange couplings supported by metal ions. The monoradical cation polymer (1˙+)n was the first example based on PAHs. The EPR spectra at 90 K of 1˙+ and 1˙− all show forbidden transitions (Δms = ±2), indicating the existence of electronic coupling between the neighboring radicals, with respective 2J = −6.54 K and 2J = −0.22 K characterized by SQUID measurements. [ABSTRACT FROM AUTHOR]

Herein, we have managed to conceive and fabricate a core–shell structured triangle-like array, where a selenylation-treated MOF array was grown in situ on a conducting substrate as a highly conductive framework to support a high loading of Mo-doped nickel–cobalt LDH nanoflakes. This hierarchical electrode integrates the advantages of a defect-rich electronic state, large active area and rich reaction sites, delivering a high areal capacity of 5.16 C cm−2 and a high rate capability. [ABSTRACT FROM AUTHOR]

Developing efficient and durable catalysts for methanol oxidation is of great significance for direct methanol fuel cells. Herein, we realized the deposition of ultra-trace Pt nanoparticles by atomic layer deposition (ALD) onto a three-dimensional (3D) titanium nitride (TiN) nanowire array grown on carbon cloth (CC), in which the 3D TiN nanowires provide a stable platform for the Pt nanoparticles, besides the inherent properties of high corrosion resistance and conductivity. Owing to the superior characteristics of the 3D TiN nanostructure as the support material and the strong interaction between Pt and TiN, the Pt nanoparticles on the TiN nanowire array show an enhanced electrocatalytic activity toward methanol oxidation compared to a commercial Pt/C catalyst. This work provides an effective strategy to fabricate 3D high-performance electrocatalysts for future energy applications. [ABSTRACT FROM AUTHOR]