ChemInform Abstract: A Facile Synthesis and Characterization of Sodium Bismuth Sulfide (NaBiS₂) under Hydrothermal Condition.

Abstract

A Facile Synthesis and Characterization of Sodium Bismuth Sulfide (NaBiS 2) under Hydrothermal Condition. -Nanosheets of the title compound are hydrothermally synthesized as the sole product from mixtures of Bi(NO 3)3, L-cysteine, NaOH, and H2O (autoclave, 180 C, 72 h, 46% yield). The samples are characterized by XRD, SEM, diffuse reflectance spectrophotometry, and XPS. The environmentally benign preparation method might be useful in a variety of fields, including thermoelectric and light harvesting materials. -(KANG, S.; HONG, Y.; JEON*, Y.; Bull. Korean Chem.

Optoelectronic Structure and Photocatalytic Applications of Na(Bi,La)S2 Solid Solutions with Tunable Band Gaps

“…NaLaS 2 and NaBiS 2 materials have a cubic NaCltype structure where the sulfur occupies the chlorine sublattice, while cations (Na and La/Bi) statistically occupy the Na sublattice as a solid solution. 12,27,47 The final mass yields were ∼86 and ∼90% based on lanthanum and bismuth, respectively. The single-phases of NaLa 1−x Bi x S 2 solid solutions were obtained by varying the molar ratio of Bi to La; there was no impurity phase.…”

“…11 Experiments showed that ABiS 2 (A = Li, Na, and K) crystallize as compounds with a disordered NaCl-type cubic structure, 11 and the primary results of NaBiS 2 showed an optical band gap of ∼1.2 eV. 12 This band gap falls within the ideal range for photovoltaic solar cell requirements or tandem cells. 8,13 However, this band gap is often too small for photocatalytic overall water splitting.…”

“…To date, the NaBiS 2 powder material is obtained via a hydrothermal route; 12 it was recently synthesized via a solution-phase method. 30 The difficulty of using these protocols for NaLaS 2 synthesis is associated with the strong affinity of La for oxygen (water), which leads to the formation of unavoidable lanthanum oxide impurities.…”