“…In a series of semiconductor nanocrystals, tin-based nanocrystals have always been a unique existence because they do not contain highly toxic elements, such as Cd and Hg, and belong to green and environmental protection materials. Not only that, the reserves and price of tin have obvious advantages, compared with the nanocrystals containing In, making it an important candidate for replacing Ag–In–S and Cu–In–S nanocrystals. , In the past decade, nanocrystals such as Cu–Sn–S (CTS) and Ag–Sn–S have been widely used in thin film solar cells and made significant progress, but the research in photocatalytic degradation, photocatalytic hydrogen production, and energy storage is significantly less than that in solar cells. ,− However, it is worth noting that nanocrystals such as CTS and ATS have excellent optical properties, such as a high absorbance coefficient and adjustable band gap, which make them promising in the field of photocatalysis and photoelectrocatalysis. − Several recent reports have successfully demonstrated that CTS and ATS and their composite materials can perform photocatalytic degradation of dyes and photocatalysts for H 2 production, − but most of them are not pure ATS and CTS but composites; the preparation process is very complex, and the small band gap of ATS material (1.3–1.6 eV) leads to the unsatisfactory photocatalytic efficiency . Moreover, the preparation of metal sulfide NCs is mostly carried out in organic solutions.…”