Tao Jiang,Junjie Xu,Chuntao Ge,Jie Pang,Jun Zhang,Geir Martin Haarberg,Saijun Xiao
Molten salt electrophoretic deposition is a novel method for preparing coatings of transition metal borides such as TiB2, which has emerged in recent years. To broaden the applications of transition metal boride coatings prepared by this method, this paper investigates the corrosion resistance of TiB2coatings, produced through molten salt electrophoretic deposition, to liquid zinc. By applying a cell voltage of 1.2 V (corresponding to an electric field of 0.6 V/cm) for 1 h in molten NaF-AlF3, the nanoscale TiB2particles migrated to the cathode and were deposited on the graphite substrate, forming a smooth and dense TiB2coating with a thickness of 43 μm. Subsequently, after subjecting the TiB2-coated graphite to corrosion resistance tested in molten zinc for 120 h of continuous immersion, no cracks were observed on the surface or within the coating. The produced TiB2coating demonstrated excellent corrosion resistance. These research results suggest that the fully dense TiB2coating on the graphite substrate, produced through molten salt electrophoretic deposition, exhibits excellent corrosion resistance to liquid zinc.
Hongchao Li,Jianpeng Zou,Senlin Xie,Xian Leng,Di Gao,Hongzhi Yang,Xu Mao
Inexpensive graphite substrate is applied to grow WSe 2 nanofilms for catalytic application in the hydrogen evolution reaction . W nanofilms with a thickness of about 10 nm were deposited onto the graphite substrate by direct-current magnetron sputtering . The graphite with 10 nm W nanofilms was rapidly selenized at 600 °C in horizontal tube furnace to form WSe 2 nanofilms. Scanning electron microscopy, Raman spectroscopy , high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy indicated that graphite surface was covered by nano-sized vertically aligned WSe 2 platelets. The effects of the N 2 pressure in the selenization process on the HER performance have been studied in details. Turning of the selenization parameters can optimize the HER performance of the WSe 2 nanofilms, which has been evaluated via linear sweep voltammetry and Tafel slope. WSe 2 nanofilms prepared at the highest N 2 pressure of 0.08 MPa behave optimal performance. The current density reaches 10 mA cm −2 at an over potential around −189 mV vs reversible hydrogen electrode and corresponding Tafel slopes is ∼72 mV dec −1 . WSe 2 nanofilms electrodes exhibit high stability in acidic solution which shows no degradation after 10000 continuous cycles. Thus, WSe 2 nanofilms exhibit superior electrocatalytic performance which is much better than those recently reported grown on carbon paper substrate and W foil.
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