How to prepare tungsten disulfide electrocatalytic hydrogen evolution catalyst? Or, how to prepare WS2 nanosheets for electrocatalytic hydrogen evolution reaction? The researchers proposed a method of synthesizing WS2 nanosheets on carbon cloth. This method has the advantages of simple operation, low cost and controllable procedure.
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Preparing Tungsten Disulfide Electrocatalytic Hydrogen Evolution Catalyst
Take 2 g of sodium tungstate and 25 g of hydrochloric acid dissolved in 250 mL of deionized water, stir for 30 min to obtain a uniform solution. Take 20 mL of the obtained solution into a stainless steel autoclave (50 mL), and then add 1 g of ammonium sulfate to the solution. A piece of carbon cloth (2cm×2cm) was ultrasonically cleaned with acetone, deionized water and ethanol successively, placed in an autoclave and sealed, and kept at 180 °C for 16 h. After cooling the autoclave to room temperature, the carbon cloth was taken out and rinsed with deionized water several times, and dried at 60 °C in ambient air. Finally, the obtained tungsten trioxide/carbon cloth (WO3/CC) was calcined in air at 450 °C for 1 h. Under the protection of argon atmosphere, the tungsten trioxide was calcined in the high temperature zone of the dual temperature zone tube furnace, and the temperature was raised to 600 °C at 20 °C/min. At the same time, 1 g of sulfur powder was put into the low temperature zone of the dual temperature zone tube furnace, and the temperature was raised to 200 °C at 7 °C/min, insulated for 2h. After the tube furnace was naturally cooled to room temperature, WO3/CC was taken out.
