Enhanced hydrogen production performance through controllable redox exsolution within CoFeAlO_x spinel oxygen carrier materials

Abstract

Chemical looping performance can be improved through the controllable exsolution of the redox phase in a spinel solution.

Application Research of Chaotic Carrier Frequency Modulation Technology in Two‐Stage Matrix Converter

“…However, the modulation is not carried out in the whole line voltage action time but the first half of it according to (6), namely, the working vector action time of rectifier d T s and d T s . Therefore, the local average value of DC-side voltage utilized by inverter in one carrier period is equal to 푢 = 푑 푢 1 + 푑 푢 2 = 1.5푈 (10) In the equation, 푈 im is the maximum value of input phase voltage.…”

“…To make full use of the two line voltages, the same duty ratio of inverter should be adopted in two action times, which ensures the phase angle could stay same in one carrier period. Equation (10) shows that the average value of DC-side voltage utilized by inverter is constant; thus the calculation amount is reduced effectively, which differs from that of rectifier [26][27][28]. This is because the rectifier modulation technique has not zero vectors and then the formula needs real time correction.…”

“…However, due to the fixed carrier frequency, the harmonics which appear at integer multiples of the carrier frequency of TSMC line to line voltage possess discrete and high values and produce powerful EMI. In order to meet the demands of electromagnetic compatibility (EMC), output filter should be adopted, which not only increases the volume and weight but also produces additional harmonics [7][8][9][10][11]. CCMFT is one of the most effective solutions of Carrier Frequency Modulation Technique (CFMT).…”

Combining Exsolution and Infiltration for Redox, Low Temperature CH4 Conversion to Syngas

“…Exsolution has been recently employed in chemical looping applications, specifically in chemical looping methane partial oxidation (CLPO), because of the emergent materials' properties that arise from this particular synthesis method [9][10][11][12][13], like coke resistance, redox stability and enhanced activity [14][15][16][17]. We have recently proven that by evolving the exsolution concept, we can design systems that have both particles on the surface (exo-particles) and in the bulk (endo-particles) [18].…”

Non-Monotonic Trends of Hydrogen Adsorption on Single Atom Doped g-C3N4

“…These results suggest that when modeling HER on under-coordinated catalytic sites like a single atom, adsorption with more than one hydrogen should be carefully considered in order to avoid uncertainty in the theoretical conclusions. Better understanding of the HER mechanism is not only beneficial to N 2 and CO 2 reduction, but could also be beneficial in addressing the pressing challenges of hydrogen production and storage that the world faces [32][33][34][35][36]. Figure 1 shows the DFT-optimized structures of hydrogen adsorbed at a single atom site of a g-C 3 N 4 structure, using Os as an example.…”