 This research paper discusses how a new type of tin sulfide pre-catalyst, SNS, was developed, which can be used as a base material for creating a more efficient catalyst for the selective conversion of carbon dioxide into formic acid in acidic conditions. The researchers found that this new pre-catalyst had stronger intrinsic SNS bond strength compared to traditional SN-catalysts, allowing them to better stabilize any remaining sulfur species in the substrate. This allowed the formation of a more effective catalyst, SNS, H, which showed higher faradaic efficiency, 92.15 percent, and carbon efficiency, 36.43 percent, when converting carbon dioxide into formic acid under industrial current densities, up to minus 1 ACM2, in acidic conditions. This article was authored by Haifengshan, Wang Yujing, Hao Bo Li, and others.