The development of an electrocatalyst with high performance using nonprecious metals/metal oxides as well as its applications in flexible and rechargeable Zn−air batteries and water electrolyzers is in strong demand from industries. In this study, we have designed and synthesized a new (Fe 3 NiS 8−δ ) −4+δ carbon nanotube (CNT) hybrid electrocatalyst and revealed that the catalyst shows a very high oxygen evolution reaction (1.55 V at 10 mA/cm 2 ) and oxygen reduction reaction (E 1/2 = 0.82 V vs RHE) performances. Based on the analyses by in situ electrochemical X-ray diffraction together with structure analysis software, in situ electrochemical Fourier transform infrared spectroscopy, transmission electron microscopy, and computer simulations, such a high performance is derived from the sulfur vacancies that were formed via the self-doped d−p orbitals of Fe III in (Fe 3 NiS 8−δ ) −4+δ . Here, we describe an adequate explanation about the role of the iron doping in the nickel sulfides in the catalyst. Furthermore, the fabricated flexible and rechargeable Zn−air and water electrolyzer batteries using the catalyst show a low charge−discharge overpotential gap of 0.66 V and a 237 mA/cm 2 current density at 1.9 V, which is very important for the development of a rechargeable Zn−air battery and water electrolyzer with a high performance. First-principles calculations are employed to investigate the reaction mechanisms and elucidate the effect of the CNT support for the catalytic activity.

This paper describes a polymerizable liquid crystal, LCK-5001, and its reverse wavelength dispersion property that is suitable for OLED displays. Circular polarizing film using this new liquid crystal was developed with significant reduction in thickness versus conventional films. Optical and physical characteristics of circular polarizing film using LCK-5001 are discussed.

As the efficient electrodes in energy conversion and storage devices, we focused on the development of a polymer-type non-precious metal-coordinated eco-friendly catalyst with a high performance, which is of importance...

Metrics & MoreArticle Recommendations * sı Supporting Information T he authors regret that the original Supporting Information (SI) document contains errors and is incorrect. It should be replaced with the new, corrected SI file.In the revised Supporting Information, we have changed the sentences about the gas chromatography (GC) setup used for water electrolyzer experiments as follows (section Materials and Methods in Section 1.1):The gas chromatography (GC) setup used for water electrolyzer experiments is a Micro GC 3000A model of Agilent (we thank Prof. Hirosige Matsumoto, I2CNER, Kyushu University for the use of this machine). The electrochemical cell for attenuated total reflectance infrared (ATR-IR) of the VeeMax III model was purchased from Pike Technologies. In these experiments, we used a ZnSe crystal of 60°reflection angle for all measurements. The electrochemical cell for FT-IR was constructed by ourselves. The peristaltic pump was used from mini-pump variable flow of Fisher brand.