Self-Templating Synthesis of Mn-Doped MoS2 Nanosheets Grown on Tubular N-Doped Carbon with Enhanced Peroxidase-Like Performance.

Exploring sustainable and highly active catalysts for enzyme-like catalysis is vital for the development and application of nanozymes. Herein, we prepared Mn-doped MoS2 nanosheet (NSs)-supported hollow mesoporous carbon nanotubes (CNTs) through a one-pot hydrothermal reaction and a subsequent annealing treatment under nitrogen atmosphere. Using (NH4)2MoO4 and thiourea as the precursor of MoS2, MnO2 nanowires (NWs) provided the Mn source for doping MoS2 and as the initiator to promote the pyrrole polymerization to form a one-dimensional (1D) polypyrrole (PPy) shell. During sulfidation, released H+ cations diffused through PPy pores into the MnO2 NWs core, causing their dissolution. As a result, hierarchical 1D hierarchical PPy@Mn-MoS2 was successfully formed. After thermal treatment, the obtained nitrogen-doped CNTs@Mn-MoS2 exhibited excellent peroxidase-like activity and stability owing to the unique tubular structure and Mn-doped MoS2 NSs. This involves a self-sacrificial template and transition-metal doping; this strategy provides a method to precisely regulate the intrinsic catalytic activity and construct the tubular structure toward enzyme-like catalysis and other energy-related processes.