Hierarchical branched α-MnO₂: one-step synthesis and catalytic activity

Abstract

Hierarchical pine tree-like a-MnO 2 architectures are prepared by a facile one-step method without any template. The hierarchical a-MnO 2 is composed of branched a-MnO 2 short nanorods assembled onto the backbone of an a-MnO 2 long nanowire. Time-dependent experiment shows that the growth process of the branched a-MnO 2 nanostructures is the formation of b-MnOOH and then the transformation to a a-MnO 2 branched structure in a step by step manner. Owing to its specific structure features, the hierarchical pine tree-like a-MnO 2 exhibits superior catalytic performance in the catalytic combustion of dimethyl ether with a light-off temperature (T 10 ) at 169 C and a complete conversion temperature (T 90 ) of 235 C, which is far better than commercial MnO 2 . Fig. 1 XRD pattern (a) and XPS spectra (b, Mn 2p; c, survey) of the hierarchical branched a-MnO 2 . 46530 | RSC Adv., 2017, 7, 46529-46535 This journal is

Hydrothermal synthesis of a two‐dimensional g‐C3N4/MoS2/MnOOH composite material and its potential application as photocatalyst

“…The spectrum obtained from the analysis of the composite system (Fig. (c)) reveals the signals relating to the MnOOH monoclinic phase, with its principal peak ((111) plane) at 26.14° (JCPDS 88‐0649) . Additionally, some tiny peaks, the principal one at 36° corresponding to the (211) plane of the Mn 3 O 4 phase (JCPDS 24‐0734), were also detected.…”