Molybdenum disulfide (MoS 2 ) is a promising candidate for use as a supercapacitor electrode material and non-noble-metal electrocatalyst owing to its relatively high theoretical specific capacitance, Pt-like electronic feature, and graphene-like structure. However, insufficient electrochemically active sites along with poor conductivity significantly hinder its practical application. Heteroatom doping and phase engineering have been regarded as effective ways to overcome the inherent limitations of MoS 2 and enhance its ion storage and electrocatalytic performance. In this study, a plasma-assisted nitrogen-doped 1T/2H MoS 2 heterostructure has been proposed for the first time, resulting in excellent supercapacitor performance and hydrogen evolution reaction activity. XPS, Raman, and TEM analysis results indicate that N atoms have been successfully doped into MoS 2 nanosheets via roomtemperature low-power N 2 plasma, and the 1T/2H hybrid phase is maintained. As expected, the 1T/2H MoS 2 heterostructure after a 10 min plasma treatment displayed a much boosted supercapacitive performance with a high specific capacitance of 410 F g −1 at 1 A g −1 and an excellent hydrogen evolution property with a low overpotential of 131 mV vs RHE at 10 mA cm −2 for hydrogen evolution reaction. The excellent performance is superior to most of the recently reported outstanding MoS 2 -based electrode and electrocatalytic materials. Moreover, the as-assembled flexible symmetric supercapacitor shows a high specific capacitance of 84.8 F g −1 and superior mechanical robustness with 84.5% capacity retention after 2000 bending cycles.

The formation of FeCO3 and Fe3O4 on carbon steel and their protective capabilities against CO2 corrosion at elevated temperature and pressure. Corrosion Science, 157. pp. 392-405.

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This is a repository copy of Evolution and characterization of the film formed on super 13Cr stainless steel in CO2-saturated formation water at high temperature.

Making full use of solar energy and achieving high charge separation efficiency are critical factors for the photocatalysis technique. In this work, we report core-shell structured fibrous phosphorus (f-P) coated P-doped CrO (CrO:P@f-P) hybrid composites with a strong optical absorption in the full region of 200-2600 nm. The CrO:P@f-P hybrid composites exhibit a record photocatalytic efficiency under UV, visible and near-infrared light irradiation, demonstrating as promising photocatalysts for the full utilization of solar energy. Systematical investigations combining experimental and theoretical work show that P doping modifies the electronic band structures and creates defective levels in the forbidden gap of CrO which extends the optical absorption to the visible and near-infrared regions. Highly crystalline fibrous phosphorus in situ grown on the CrO particles constructs a core-shell hybrid structure which guarantees intimate interfacial contact between f-P and CrO:P and facilitates the separation of photogenerated electron-hole pairs. This study develops a promising system based on earth abundant element P to utilize the overall spectrum of sunlight for photochemical applications.

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