Shanghai Institute of Ceramics Makes Progress in Piezocatalysis Research
Date : 2023-06-08
2021-04-07 Source: Shanghai Institute of Silicate
The voltage material has a non-centre symmetrical structure, which induces an asymmetric distribution of the surface charge with added mechanical power. The non-balanced charge of surface concentrations can trigger electrochemical reactions to the activation of water and oxygen molecules and the generation of activated oxygen species under moderate conditions, thus enabling energy molecules (O).2、H2O、CH4Conversion is considered to be an important potential response to green chemical synthesis.
Recently, the Shanghai Institute of Silicate Research of the Chinese Academy of Sciences, through the design of a rational catalytic response system, has produced a series of semiconductor materials with voltage catalytic effects. Research has been carried out in the areas of voltage catalytic analysis of hydrogen, voltage catalytic generation of double-oxygen water, and voltage catalytic transformation of methane, revealing mechanisms for the activation and conversion of reaction mechanisms of small energy molecules on the surface of the catalyst. The study is important for promoting the use of natural and man-made vibration energy to transform energy-containing small molecules into green energy.
With extra ultrasound, the super thin MoS.2The interior produces a voltage field. As ultrasound energy increases, the in-house power field generated within the material becomes more efficient, and the stream separation is more efficient, so when ultrasound energy increases, MOS2Hydrogen production efficiency has increased significantly. Yes, Mos.2Electro-polarity and surface polarization not only increase the active position of the material surface, but also separate the electronics and H of the built-in electric field+Accumulation at the same location has further contributed to increased hydrogen efficiency and to the construction of empty spot capture points, facilitating the separation of the carrier and achieving approximately 1250 mmol g-1·h-1High hydrogen efficiency. This idea of a combination of voltage and catalytic effects provides new solutions for semiconductor catalyzing and nanoenergy conversion units, and is expected to widen the application of voltage materials in catalytic applications. The results of the research are published inJournal of Materials Chemistry A 6 (2018) 11909‐11915。
BiOCl, C.3N4The voltage response of the material and the confirmation of the voltage-catalytic activity point of the material through the relevant metal ion oxidation reaction. In the air, ultra-BiOCl or C.3N4Pure water suspensions can get 28 μmol/h and 34 μmol/h, respectively.2O2Production rate, higher than the corresponding photocatalytic H2O2Production rates indicate that these materials have a greater catalytic effect on oxygen molecules under the voltage field and that the efficiency of the voltage catalytic response has the potential for further application development. The results of the research were published in separate documents.ChemSusChem 11 (2018) 527 â531 andJournal of Materials Chemistry A 6 (2018) 8366‐8373。
The conversion of methane to low-carbon alcohol was achieved using the voltage catalytic effect of calcium hydroxyphosphate Hap through a chain of methane oxidation with methanol. Through the adsorption of the probe molecule and Au3+Retroactive reactions have confirmed that the mechanism of action of the Hap under ultrasound is voltage rather than ultrasound. Under ultrasound oscillation, the surface sensor charge of HAP can initiate electrochemical reactions as a surface cathode/ anode, respectively, and activates methane, oxygen and water molecules, in which the hydroxyl radical C-H key produced by the activation of oxygen and water molecules can attack methane into low carbon alcohol. Methanol, ethanol and isopropanol products are available for voltage catalytic conversion on Hap at 84.4, 43.2, 9.6 μmolg-1h-1and no carbon monoxide or carbon dioxide generation. The study extended the response path for methane conversion through carbon-coupling, mitigating overoxidation of methanol, and provided an idea for upgrading C1 compounds based on voltage catalyticization. The results of the research are published inNano Energy, 79(2021) 105449‐105459。
Research is supported by, among others, the National Fund for Natural Sciences.
(a) Volatile catalytic transformation of methane on Hap; (b) effects of ultrasound power on conversion efficiency; (c) Hap demurrage line and field agglomeration curve