Ultrathin porous Pd metallene as highly efficient oxidase mimics for the colorimetric detection of chromium (VI)

Enzyme Mimetic Activity of Intercalated Pd–H Nanosheets for Bioanalysis

“…Additionally, the NSAs reveal excellent storage stability, retaining 98% of their activity even after 100 days (Figure S3f). Comparison to some previous literature 16,19 showed that the V max value of Pd−H NSAs is higher than that of other Pdbased nanozymes (Table S3). Moreover, the K cat (26.43 s −1 ) and K cat /K m (50.83 s −1 ) are dramatically higher than those of Pd NSAs and some of the previously reported Pd-based nanozymes (Table S3).…”

“…Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images (Figure a,b) reveal that the obtained Pd–H NSAs still maintain their initial nanosheet-assembled flowerlike structure with a higher yield. Moreover, nanosheets possess abundant pore-like structures on their surface as a result of W(CO) 6 decomposed to CO (Figure c). ,, HRTEM images were collected to determine the microstructure of the samples. From the results, the lattice spacing of the (111) plane for Pd NSAs (0.223 nm) was measured to be a little less than that for Pd–H NSAs (0.225 nm), which indicates the hydrogenation-generated tensile strain on the samples (Figure d,e).…”

“…Moreover, nanosheets possess abundant pore-like structures on their surface as a result of W(CO) 6 decomposed to CO (Figure 1c). 15,16,52 HRTEM images were collected to determine the microstructure of the samples. From the results, the lattice spacing of the (111) plane for Pd NSAs (0.223 nm) was measured to be a little less than that for Pd−H NSAs (0.225 nm), which indicates the hydrogenation-generated tensile strain on the samples (Figure 1d,e).…”

“…Macromolecular biocatalysts, named enzymes found in living organisms and mainly composed of proteins, are responsible for regulating the possible chemical reactions in living organisms . Owing to their high substrate specificity and catalytic activity, natural enzymes have been extensively used in biological fields, industry, medicines, etc. − However, their low stability, high cost, and complex production process increase the demand for artificial enzymes, which are proven to be promising candidates in the fields of nanotechnology, , biotechnology, , and nanomaterials science. , Enzyme-like activities of nanozymes, such as oxidase-like, − peroxidase-like, − and catalase-like, , have been explored through various studies. Furthermore, nanozymes have been explored for the antibacterial activity at physiological pH in the presence of adenosine triphosphate (ATP) .…”

“…Moreover, the electronic structure could be modified by combining Pd with some other transition metals, such as Ru, Bi, Cu, Pb, and Ag, resulting in enhanced catalytic performance . Furthermore, 2D materials with porous structures improve the stability of the reaction while also providing more reaction sites for the reaction. ,,, However, some undesirable drawbacks, such as the aggregation of fractures during the catalytic reactions, could result in obvious degradation of the performance . Therefore, a three-dimensional nanosheet assembly structure is needed for promising catalytic performance, but the process is still very challenging …”