Pt atomic cluster loaded WO3 nanosheet hydrogen evolution reaction catalyst and preparation method thereof
A hydrogen evolution reaction and catalyst technology is applied in the field of new Pt atomic cluster supported WO3 nanosheet HER electrocatalyst and its preparation, which can solve the problem that the catalytic activity of non-precious metal catalysts cannot meet the requirements, the Pt dispersion and atom utilization are low, and the noble metal content is high. problems, to achieve the effect of taking into account the catalytic performance, promoting development, and high economic benefits
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[0041] The invention relates to a novel Pt atomic cluster loaded WO 3 Nanosheet electrocatalytic hydrogen evolution reaction (HER) catalyst and preparation method thereof, hydrogen evolution reaction catalyst with non-metallic catalyst WO 3 is the subject, and WO 3 In situ growth of WO on flexible self-supporting substrates 3 The nanosheet structure also includes loading on the WO in the form of atomic clusters 3 WO formed on nanosheets 3 Pt on the oxygen defect surface, the content of Pt is WO 3 0.2-0.25wt% of the total mass of Pt. The Pt / WO 3 The catalyst is the in situ growth of WO on a flexible self-supporting substrate material such as carbon fiber cloth 3 Nanosheets, and then capture Pt atoms through the manufactured oxygen vacancies to form well-dispersed Pt atomic clusters, because Pt and WO 3 The synergistic catalytic effect between the nanosheet substrates enables the new catalyst to exhibit HER catalytic activity comparable to that of commercial 20wt% Pt / C el...
Embodiment 1
[0058] According to the above technical scheme and process flow of the present invention, first prepare WO 3 Nanosheet precursor materials. Weigh 0.625g tungstic acid and dissolve it in 20ml of 12wt% H 2 o 2 solution, and then heated to 95 ° C in a water bath, magnetically stirred for 3 h. Then the solution was transferred to an 80ml reaction kettle, 0.2g of anhydrous sodium sulfate, 115μl of hydrochloric acid and 2×2cm carbon fiber cloth were added, and hydrothermal reaction was carried out at 180°C for 12h to obtain WO 3 @CFC.
[0059] The carbon fiber cloth (CFC) after the above reaction was gently purged with deionized water, dried and placed in a tube furnace, and 5% H 2 and 95% Ar mixed gas, heated to 200°C at a heating rate of 5°C / min, and kept for 2 hours to obtain def- WO 3 @CFC.
[0060] Dissolve 2.4g of ammonium carbonate in 25ml of water to obtain solution 1, put it into the carbon fiber cloth obtained above; then add 10mg of H 2 PtCl 6 ·6H 2 O was added t...
Embodiment 2
[0063] According to process flow described (same as embodiment 1), take by weighing 0.625g tungstic acid and dissolve in 20ml of 12wt%H 2 o 2 solution, and then heated to 95 ° C in a water bath, magnetically stirred for 3 hours, and other operations were the same as in Example 1. Subsequently, 2.4g of ammonium carbonate was dissolved in 25ml of water, and put into the carbon fiber cloth obtained above to obtain solution 1; then 10mg of H 2 PtCl 6 ·6H 2 O was added to 25ml of water to obtain solution 2; solution 2 was added dropwise to solution 1 using a microsampler, and then kept at room temperature for 2h. Then, the carbon cloth was taken out and dried and placed in a tube furnace, and 5% H 2 and 95% Ar mixed gas, heated to 200°C at a heating rate of 5°C / min, and kept for 2h to obtain the final product Pt atomic clusters loaded with WO 3 Nanosheet composite catalyst material (Pt / def-WO 3 @CFCMaterials). The material is in N 2 saturated 0.5M H 2 SO 4 Excellent elect...
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