3results about How to "Promote passivation" patented technology

This invention belongs to the field of wet electronic chemicals technology, specifically relating to a method for preparing electronic-grade hydrogen peroxide. The method includes the following steps: adjusting the concentration of raw hydrogen peroxide, and then filtering it sequentially through a reverse osmosis membrane, a modified cation exchange resin, an anion exchange resin, and a mixed ion exchange resin to obtain electronic-grade hydrogen peroxide. The modified cation exchange resin used is modified based on conventional cation exchange resin through pore expansion and grafting, optimizing the spatial matching of pore structure and functional sites. This achieves passivation of metal ions, enhanced adsorption capacity, and improved oxidation resistance, as well as a deep synergistic effect of these three effects. Ultimately, it achieves the dual goals of efficient purification and stable operation of the resin in the hydrogen peroxide system. The resulting electronic-grade hydrogen peroxide can reduce the content of single impurity metal ions to below 5 ppt, meeting the requirements of SEMI G5 standards, and can be directly applied to high-end manufacturing fields such as semiconductor wafer cleaning.

The invention relates to a solar cell, a solar cell and a preparation method thereof, and a photovoltaic module. The solar cell includes: a semiconductor substrate; the first tunneling layer is located on the surface of one side of the semiconductor substrate; the carbon-doped polycrystalline silicon layer is located on the surface of the side, away from the semiconductor substrate, of the first tunneling layer; the second tunneling layer is located on the surface of the side, away from the first tunneling layer, of the carbon-doped polycrystalline silicon layer; the doped polycrystalline silicon layer is located on the surface of the side, away from the carbon-doped polycrystalline silicon layer, of the second tunneling layer, the first passivation layer is electrically connected with the doped polycrystalline silicon layer, and ohmic contact is achieved through the first electrode and the doped polycrystalline silicon layer; the second tunneling layer is in contact with the doped polycrystalline silicon layer on the outer layer and can block the metal slurry of the metal electrode; the carbon-doped polycrystalline silicon layer has an anti-corrosion effect on the metal slurry, can inhibit the corrosion of the slurry to the semiconductor substrate and the first tunneling layer, can improve the contact stability, and can improve the conversion efficiency of the solar cell.

This invention provides a method and application for preparing bio-organic fertilizer through synergistic composting of biochar-containing biogas residue, belonging to the field of organic fertilizer preparation technology. The method includes: preparing biogas residue through anaerobic fermentation of livestock and poultry manure and crop straw; adding biochar and a compound microbial agent; conducting high-temperature aerobic composting; and obtaining bio-organic fertilizer through maturation and aging. The amount of biochar added is 5%-10% of the dry basis weight of the composting raw materials; the aerobic composting time is 35-45 days; and the high-temperature composting temperature is 55-65℃. The compound microbial agent includes *Bacillus steatophilus*, *Bacillus amyloliquefaciens*, and *Bacillus mucilaginosus*. The bio-organic fertilizer obtained by this invention can be used for crop soil improvement. This invention, through the synergistic effect of biogas residue, biochar, and compound microbial agent, effectively shortens the composting cycle, improves compost maturity, reduces nitrogen loss, passivates heavy metals, and significantly improves the quality of organic fertilizer.