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Preparation method of phosphorus and sulfur co-modified cobaltous oxide and application of phosphorus and sulfur co-modified cobaltous oxide in photocatalytic decomposition of water

A cobalt oxide and co-modification technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as poor stability of photocatalytic water splitting, and achieve improved hydrogen production efficiency and good visible light. The effect of catalytic hydrogen production activity and simple preparation method

Active Publication Date: 2021-10-01
XI AN JIAOTONG UNIV
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Problems solved by technology

However, in the current research results, the efficiency of CoO to completely split water to produce hydrogen cannot meet the requirements of industrial production, and its photocatalytic water splitting stability is poor, and the gas separation problem of hydrogen and oxygen in the product has not been solved.

Method used

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  • Preparation method of phosphorus and sulfur co-modified cobaltous oxide and application of phosphorus and sulfur co-modified cobaltous oxide in photocatalytic decomposition of water
  • Preparation method of phosphorus and sulfur co-modified cobaltous oxide and application of phosphorus and sulfur co-modified cobaltous oxide in photocatalytic decomposition of water
  • Preparation method of phosphorus and sulfur co-modified cobaltous oxide and application of phosphorus and sulfur co-modified cobaltous oxide in photocatalytic decomposition of water

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preparation example Construction

[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 respectively, 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 c...

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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Abstract

The invention discloses a preparation method of phosphorus and sulfur co-modified cobaltous oxide and application of the phosphorus and sulfur co-modified cobaltous oxide in photocatalytic decomposition of water, Co (OH) 2, a phosphorus source and a sulfur source are mixed and ground uniformly, and then calcined for 1-2 hours at 250-350 DEG C in Ar atmosphere to obtain the phosphorus and sulfur co-modified cobaltous oxide. The phosphorus and sulfur elements are simultaneously introduced into a CoO crystal structure for the first time, the CoO crystal structure is kept unchanged, the prepared phosphorus and sulfur co-modified cobaltous oxide has good visible-light response, can catalytically decompose pure water under visible-light irradiation and simultaneously generate hydrogen and hydrogen peroxide, shows good visible-light catalytic hydrogen production activity, the visible light catalysis hydrogen production rate reaches 89.0 [mu]mol h<-1 >, the quantum efficiency at 425 nm is 6.4%, and the photocatalyst has good hydrogen production stability.

Description

technical field [0001] The invention belongs to the technical field of hydrogen energy preparation, and relates to the photocatalytic clean preparation technology of hydrogen energy, that is, the technology of simulating the use of solar energy to realize the photocatalytic decomposition of water to produce hydrogen energy at low cost, in particular to the preparation method of phosphorus and sulfur co-modified cobaltous oxide and its Application of photocatalytic water splitting. Background technique [0002] Since the beginning of the 21st century, the rapid development of science and technology and the advancement of the global industrialization process have increased the demand for energy in human society. The non-renewability and rapid consumption of fossil energy have caused an increasingly serious energy crisis, and the development and utilization of fossil energy is often accompanied by serious environmental pollution problems, which greatly threaten the survival and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185B01J37/08C01B3/04
CPCB01J27/1853B01J37/0036B01J37/082C01B3/042B01J35/39Y02E60/36
Inventor 关祥久程诚师进文郭烈锦
Owner XI AN JIAOTONG UNIV
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