Preparation method of phosphorus and sulfur co-modified cobaltous oxide and its application in photocatalytic water splitting
A technology for cobaltous oxide and water splitting, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as poor photocatalytic water splitting stability, improve hydrogen production efficiency, and be easy to repeat. , the effect of good hydrogen production stability
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[0029] The preparation method of phosphorus and sulfur co-modified cobaltous oxide comprises the following steps:
[0030] Step 1: Weigh 1.6mol NaOH (or KOH) and 1mmol Co(NO 3 ) 2 ·6H 2 O (or cobalt chloride) was added to 20mL deionized water, stirred and dissolved to obtain NaOH aqueous solution and Co(NO 3 ) 2 aqueous solution. Then Co(NO 3 ) 2 The aqueous solution was added dropwise to aqueous NaOH and stirred at 25 °C for 30 min. Subsequently, the resulting mixed solution was transferred to a 100 mL polytetrafluoroethylene liner and sealed with a stainless steel reactor, and reacted at 100 ° C for 24 h. After cooling to room temperature naturally, the reactant was centrifuged and washed five times with deionized water and placed in a vacuum. Dry in an oven at 50°C for 12 hours to finally obtain Co(OH) 2 .
[0031] Step 2: Choose NaH 2 PO 2 ·H 2 O and sulfur powder are used as phosphorus source and sulfur source respectively. Phosphorus and sulfur coexist during...
Embodiment 1
[0036] Step 1: Weigh 160mmol NaOH and 1mmol Co(NO 3 ) 2 ·6H 2 O was added to 20 mL of deionized water, stirred and dissolved to obtain two aqueous solutions. Then Co(NO 3 ) 2 The aqueous solution was added dropwise to NaOH aqueous solution, and stirred at room temperature for 30 min. Subsequently, the resulting mixed solution was transferred to a 100 mL polytetrafluoroethylene liner and sealed with a stainless steel reactor, and reacted at 100 ° C for 24 h. After cooling to room temperature naturally, the reactant was centrifuged and washed five times with deionized water and placed in a vacuum. Dry in an oven at 50°C for 12 hours, and the final sample is Co(OH) 2 .
[0037] Step 2: 1mmol Co(OH) obtained in Step 1 2 with 5mmol NaH 2 PO 2 ·H 2 O and 1 mmol of sulfur powder were mixed and ground evenly, and the ground powder was calcined at 300 °C for 2 h under Ar atmosphere (heating rate 2 °C / min), and after cooling in the furnace, the obtained sample was washed 4 tim...
Embodiment 2
[0043] Step 1: Weigh 160mmol NaOH and 1mmol Co(NO 3 ) 2 ·6H 2 O was added to 20 mL of deionized water, stirred and dissolved to obtain two aqueous solutions. Then Co(NO 3 ) 2 The aqueous solution was added dropwise to NaOH aqueous solution, and stirred at room temperature for 30 min. Subsequently, the resulting mixed solution was transferred to a 100 mL polytetrafluoroethylene liner and sealed with a stainless steel reactor, and reacted at 100 ° C for 24 h. After cooling to room temperature naturally, the reactant was centrifuged and washed five times with deionized water and placed in a vacuum. Dry in an oven at 50°C for 12 hours, and the final sample is Co(OH) 2 .
[0044] Step 2: 1mmol Co(OH) obtained in Step 1 2 with 5mmol NaH 2 PO 2 ·H 2 O and 2mmol sulfur powder were mixed and ground evenly, and the ground powder was calcined at 300°C for 2h under Ar atmosphere (heating rate 2°C / min), and after cooling with the furnace, the obtained sample was washed 4 times wi...
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