How does Na 2 CO 3 affect energy storage capacity?

Na 2 CO 3 doubled the energy storage capacity of the CaO-based materials. “850 °C–900 °C” was best for the Na 2 CO 3 doped CaO in the CaLP-TCES system. Improved CO 2 diffusion leads to the higher energy storage density of the Na + doped materials. doped CaO materials had poorer surface topography, they held much higher ESD over the repeated cycles.

Why do Cao based heat carriers sinter?

The Na 2 CO 3 doped CaO-based heat carriers have a serious tendency of sintering over the cycles, but the Na + species provided more basic sites for the promoted CaO materials, and the Na + species maybe played a key role like a catalyst to absorb CO 2 during the carbonation process.

How much energy does a neat Cao release?

The “Neat CaO” released about 3000 kJ of energy per kilogram of CaO-based materials during the 1st carbonation when operated at either “850 °C–900 °C” or “750 °C–900 °C”, while it only showed an ESD of 2500 kJ/kg when operated at “650 °C–900 °C” as shown in Fig. 2 (a).

How are Na 2 CO 3 doped Cao-based heat carriers synthesized?

The Na 2 CO 3 doped CaO-based heat carriers were synthesized by a simultaneous hydration − impregnation method as shown in Figure S1.

What is the binding energy of 10nA 2 CO 3 / CaO?

The binding energies of Ca 2p3/2 and Ca 2p1/2 of “Neat CaO” were located at 346.9 eV and 350.5 eV , while the peaks of the binding energy of “10Na 2 CO 3 /CaO” shifted 2 eV lower than the “Neat CaO”. The X-ray photoelectron spectroscopy of O 1 s was analyzed and displayed in Fig. 13 (b).