Control over the morphology and structure of manganese oxide by tuning reaction conditions and catalytic performance for formaldehyde oxidation

The effect of pH and anions on the anisotropic growth of MnO2

“…Notably, the formation of dMnO 2 in this paper seemed to be related to the existence of PO 4 3À . Similar phenomenon was also detected by Zhou et al [20], but how anions like PO 4 3À influence the octahedra framework is still unknown. Fig.…”

A novel formaldehyde sensor based on the pseudocapacitive catalysis of birnessite

“…Birnessite (δ-type; A x MnO 2 where A = H + or metal cation) is a naturally-occurring manganese oxide which consists of a two-dimensional layered structure of edge-shared MnO 6 . Among various polymorphs of MnO 2 , birnessite can be regarded as the most effective catalyst for gas-phase oxidative decomposition of FA at relatively low temperatures [16][17][18][19]. Accordingly, an electroactive thin film of birnessite adhered well to a conducting substrate would be a good sensor material for FA detection.…”

Synthesis of layered birnessite-type manganese oxide thin films on plastic substrates by chemical bath deposition for flexible transparent supercapacitors

“…Among all the crystallographic forms of manganese oxide [20][21][22][23][24], the use of birnessite-type MnO 2 has become popular due to its layered structure, which is beneficial for the intercalation and deintercalation of H + or alkali metal cations, and shows promising properties in enhancing the special capacitance [25]. Although layered birnessite-type MnO 2 thin films can be prepared by the sol-gel method [26,27], electrostatic spray [28], hydrothermal synthesis [29,30], and electrodeposition [31], large-scale industrial production via these approaches will be limited due to their harsh reaction conditions, energy consuming and complicated procedures. The present work proposes the synthesis of layered birnessite-type MnO 2 thin films directly grown on indium-tin-oxide (ITO)-coated polyethylene terephthalate (PET) substrates at room temperature by a facile, effective and inexpensive chemical bath deposition technique (CBD) for flexible transparent supercapacitor applications.…”