Improving the redox performance of Mn2O3/Mn3O4 pair by Si doping to be used as thermochemical energy storage for concentrated solar power plants

Effects of TiO2 doping on the performance of thermochemical energy storage based on Mn2O3/Mn3O4 redox materials

“…Therefore, the change of the weight gain ratio in the reoxidation process indicates the change of the density of energy storage as the previous research did. 17,18 The energy storage density which was represented as the heat absorb of materials was calculated from the theoretical enthalpy according to the proportion of weight gain in this paper. Fig.…”

“…Bagherisereshki added an inert diluent into the SrO/SrCO 3 TCES system and Bielsaa used SiO 2 as the dopant in the Mn 2 O 3 /Mn 3 O 4 TCES system to inhibit the sintering of the particle to ensure the energy storage performance of the material in a long-time operation. 17,36 Therefore, in this section, we mainly analyzed the effect of adding titanium dioxide on the anti-sintering property from the TGA data of different samples under a test of 10 cycles and the TEM images. In our research, tests were conducted by the TGA analyzer and the highest temperature operating condition is 1000 C. Therefore, we thought solidphase sintering dominated the sintering process.…”

“…[14][15][16] In addition to Fe doping, some other Mn-based thermochemical energy storage materials also have been studied. For example, Bielsaa et al 17 and Yilmaz et al 18 found that doping SiO 2 to manganese oxide also can form a kind of oxygen carrier to improve the performance of reoxidation. Beyond that, Bielsaa et al 17 found that because of a higher chemical valence of Si 4+ and smaller size of SiO 2 doping Mn 2 O 3 system, the sintering of materials system could be inhibited from the point of view of solid-phase sintering and liquid-phase sintering.…”

“…For example, Bielsaa et al 17 and Yilmaz et al 18 found that doping SiO 2 to manganese oxide also can form a kind of oxygen carrier to improve the performance of reoxidation. Beyond that, Bielsaa et al 17 found that because of a higher chemical valence of Si 4+ and smaller size of SiO 2 doping Mn 2 O 3 system, the sintering of materials system could be inhibited from the point of view of solid-phase sintering and liquid-phase sintering. Solid-phase sintering can be divided into densification and grain growth, both of which depend on the mass transport rate on the grain boundary.…”

Recent Advances in Thermochemical Energy Storage via Solid–Gas Reversible Reactions at High Temperature

“…In addition, MnSiO 3 particles demonstrated a good physical stability under air at high temperatures. The effect of Si 4+ doping to Mn 2 O 3 on the reactivity and stability of the Mn 2 O 3 /Mn 3 O 4 system was also studied, over 40 reduction/oxidation cycles [90]. The re-oxidation of Mn 3 O 4 was improved with the introduction of Si cations, especially for a sample synthesized via a sol-gel method using 1 mol% Si-doping.…”