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.