ارتباط با ما
با ما تماس بگیرید
0086-21-58386256
0086-21-58386256
The highly efficient water splitting was mainly attributed to the excellent liquid adsorption and gas desorption that depends on superwettable surface, which could increase the affinity of the electrolyte to improve the catalytic efficiency, optimize the spontaneous separation of bubbles to weaken the "bubble shielding effect", minimize the ...
Fabricating effective non-precious metal-based catalysts for hydrogen production via electrochemical water splitting is of considerable importance but remains challenging. Transition metal nitrides possessing metallic character and corrosion resistance have been considered as potential replacements for precious metals. However, their activities for water …
Achieving a porous architecture with multiple‐length scales and utilizing the synergetic effects of multicomponent chemicals bring up new opportunities for further improving the electrocatalytic performance of nanocatalysts. Herein, the synthesis of a self‐supported hierarchical porous electrocatalyst based on a high‐entropy alloy (HEA) containing multiple …
The gas desorption and secondary electron multiplication induced by electron bombardment tend to induce severe low-pressure discharge effects in space microwave device cavities. Nevertheless, few studies have focused on both secondary electron emission and electron-stimulated gas desorption (ESD). Although the suppression of secondary electrons …
Who said that electricity and water don't mix? In part 1 of this series, we covered the theory and science behind how electrolysis works. In this article, we get to go and actually build something. As with many things in life there is more than one way to do it, so if you have a better way to do something, by all means, do it.And share, because there isn't any point in …
High-temperature CO 2 electrolysis via solid oxide electrolysis cells (CO 2 –SOECs) has drawn special attention due to the high energy convention efficiency, fast electrode kinetics, and great potential in carbon …
Electrochemical adsorption and desorption experiments. Electrochemical adsorption (EA)/desorption (ED) of Cs + was conducted on a VSP potentiostat (BioLogic, Seyssinet-Pariset, France) using a standard three-electrode system (Park et al., 2020). The obtained samples, Ag/AgCl (saturated KC1), and Pt mesh were used as working, reference, …
Fig. 3 presents a schematic of the electro-adsorption and electro-desorption mechanism in a CDI for a saline solution. Download: Download high-res image (117KB) ...
tion of 20–30% as the electrolyte. In alkaline electrolys - ers, the diaphragm and porous nickel-based materials are usually used as asbestos and electrode. Alkaline electroly - sis is a mature process, which only needs low investment and operation costs. However, the AWE usually exhibits a low operating current density of 200–400 mA cm−2
Here, we demonstrate that cyclic two-step electrolysis, by applying the reduction and oxidation potentials alternately, achieves current density stability and 97.8% …
Decoupled electrolysis for hydrogen production with the aid of a redox mediator enables two half-reactions operating at different rates, time, and spaces, which offers great …
The scanning tunneling microscope has been used to desorb hydrogen from hydrogen-terminated silicon (100) surfaces. As a result of control of the dose of incident electrons, a countable number of desorption sites can be created and the yield and cross section are thereby obtained. Two distinct desor …
Desorption electro-flow focusing ionization (DEFFI), a desorption-based ambient ion source, was developed, characterized, and evaluated as a possible source for field deployable ambient pressure mass spectrometry (APMS). DEFFI, based on an electro-flow focusing system, provides a unique configuration for the
For the past few years, many researchers have developed a variety of green energy system for efficient producing H 2, such as two-electrode electrolysis of water, water …
The role played by electronic and phononic excitations in the femtosecond laser induced desorption and oxidation of CO coadsorbed with O on Ru(0001) is investigated using ab initio molecular dynamics with electronic friction. To this aim, simulations that account for both kind of excitations and that only consider electronic excitations are performed. Results for …
Hence, the driving force for CO 2 desorption was higher under condition 2 comparing to condition 1, which led to a higher CO 2 production rate at p CO 2, g = 0.9 atm. When p CO 2, g decreased to 0.3 atm, the applied partial vacuum dominated the desorption of CO 2 so that the difference in CO 2 production rate was minimized.
Water splitting is an endothermic reaction and requires an energy input of ΔG=237.1 kJ mol −1 under standard conditions (25 °C, 1 atm), as shown in Equation (1). The hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) take place at the cathode and anode, respectively, and they are preferably separated by a membrane as illustrated in Scheme 1.
Currently, hydrogen production is based on the reforming process, leading to the emission of pollutants; therefore, a substitute production method is imminently required. Water electrolysis is an ideal alternative for large-scale hydrogen production, as it does not produce any carbon-based pollutant byproducts. The production of green hydrogen from water electrolysis …
The charge transfer reaction at the electrode/solution interface is regarded as a major component that limits the current densities of Li-ion batteries. A combination of density functional theory for the electronic structure calculations of an electrode and a reacting component with implicit solvation theory for an electrolyte solution is used for the lithium …
Naturally occurring amino acids have been broadly used as additives to improve protein solubility and inhibit aggregation. In this study, improvements in protein signal intensity obtained with the addition of L-serine, and structural analogs, to the desorption electrospray ionization mass spectrometry (DESI-MS) spray solvent were measured.The results were interpreted at …
The peak potential, Ey, for the reductive desorption of an n-alkanethiol mono- layer adsorbed at Au and Ag is plotted as a function of n in Fig. 7. The data shown are from voltammograms recorded at 100 mV/s in 0.5 M KOH supporting electrolyte. Discussion of the reductive desorption from Ag electrodes is deferred to Section III.F.l.
Surface Residence Times. One property of an adsorbed molecule that is intimately related to the desorption kinetics is the surface residence time - this is the average time that a molecule will spend on the surface under a given set of conditions (in particular, for a specified surface temperature) before it desorbs into the gas phase.. For a first order process such as …
Electrocatalytic oxygen evolution reaction (OER) has been recognized as the bottleneck of overall water splitting, which is a promising approach for sustainable production of H2. Transition metal (TM) hydroxides are the most conventional and classical non-noble metal-based electrocatalysts for OER, while TM basic salts [M2+(OH)2-x(Am−)x/m, A = CO32−, …
The lower ΔG H* value is associated with a lower adsorption/desorption energy barrier of H*. The lowest Δ G H* value of 0.378 eV was found at the optimal Cu site surrounded by other non-Cu metals on the …
The role of the solvent: what's special about water. Although we tend to think of the solvent (usually water) as a purely passive medium within which ions drift around, it is important to understand that electrolytic solutions would not exist without the active involvement of the solvent in reducing the strong attractive forces that hold solid salts and molecules such as …
The FTIR spectra of the water layers adsorbed on the sample surfaces, measured in the transmission mode at the Brewster incidence angle, are shown in the Supporting Information (Figure S4).The broad OH-stretching bands in the FTIR spectra were deconvoluted with three components: a strongly hydrogen-bonded (SHB) water structure with a peak below …
The e-desorption cycle was completed in 20 min and UV 254 maxima occurred within the first 4 min. The calculated e-desorption efficiency was larger than 95 % in these five FCs. Similar results regarding UV 254 removal was recorded using EC PAN-NaOH membrane in FC 1 – FC 4 (Fig. 9B SI). The intrinsic adsorption of the EC PAN-NaOH membrane was ...
This high desorption efficiency was achieved even without typical aiding agents by means of a formamidine disulfide-mediated route that prevented thiourea consumption, which is considered a major drawback of the otherwise promising reagent. Using this method, the polymer was able to maintain more than 94% desorption efficiency after five times ...
Burning fossil fuels account for over 75% of global greenhouse gas emissions and over 90% of carbon dioxide emissions, calling for alternative fuels such as hydrogen. Since the hydrogen demand could reach 120 million tons in 2024, efficient and large-scale production methods are required. Here we review electrocatalytic water splitting with a focus on reaction …
The most widely studied of these new methods, desorption electrospray ionization (DESI), uses fast-moving solvent droplets to extract analytes from surfaces and propel the resulting secondary microdroplets towards the mass analyzer. This review of DESI and other ambient methods centers on the accompanying chemical processes.
