Raman and inelastic neutron scattering spectra of (NH4)2SO3, an intermediate for solar hydrogen production

Abstract

Citation: RE Orozco-Mena et al. "Raman and inelastic neutron scattering spectra of (NH4)2SO3, an intermediate for solar hydrogen production. AbstractThe sulfur-ammonia (S-NH3) cycle uses the entire solar radiation spectrum to split water. It uses the UV radiation to promote the photolytic oxidation of ammonium sulfite to produce hydrogen and ammonium sulfate. Here, Raman and inelastic neutron scattering spectra of (NH4)2SO3·H2O at 20 K are discussed, supported by density functional theory (DFT) calculations. The feasibility of photolytic oxidation of this monohydrate to produce hydrogen at room temperature was also demonstrated.

Lithium Sulfite Enhances Cycle Performance of All-Solid-State Batteries with Li2S-Based Positive Electrode Materials

“…However, the Raman spectra of dried Li 2 SO 3 and Na 2 SO 3 are similar, as are those of dried Li 2 SO 4 and Na 2 SO 4 , suggesting that the dried Li 2 SO 3 was mainly composed of SO 3 2– units. In the Raman spectrum of dried Li 2 SO 3 , five distinct peaks appear in the range of 450–1100 cm –1 , corresponding to the internal molecular vibrations of SO 3 2– . , With the exception of the peaks in the 850–950 cm –1 range, these peaks resemble those of Na 2 SO 3 (asymmetric O–S–O: 494 cm –1 , symmetric O–S–O: 636 cm –1 , asymmetric S–O: 947 cm –1 , and symmetric S–O: 984 cm –1 ), indicating the presence of SO 3 2– units. The three peaks observed in the range of 850–950 cm –1 are attributed to interactions between SO 3 2– and H 2 O, as a similar peak is observed for Li 2 SO 3 ·nH 2 O in this wavenumber range.…”