Unraveling the effects of the coordination number of Mn over α-MnO2 catalysts for toluene oxidation

Adjusting the Coordination Environment of Mn Enhances Supercapacitor Performance of MnO2

“…[4] Recently, several studies have been devoted to adjusting the coordination environment of metal atoms to regulate the performances of metal oxides based catalysis for oxygen evolution reaction, [4] hydrogen evolution reaction, [5] CO 2 reduction, [6] and organic oxidation. [7] However, the effect on the coordination environment of metal atoms on the capacitive performance of metal oxides, as far as we know, remains elusive. In particular, no effort has been made to tailoring electrochemical properties of MnO 2 as supercapacitor electrode material in considering adjusting the coordination environment of Mn atoms.…”

Efficient catalytic combustion of toluene at low temperature by tailoring surficial Pt0 and interfacial Pt-Al(OH)x species

“…Besides the intermediate species over the catalysts, the characteristic bands of hydroxyl groups presented from 3800 to 3600 cm −1 ( Figure 6 A) was associated with the OH species on the catalyst surface ( Liu et al., 2018 ; Wang et al., 2020b ). The negative band at 3763 cm −1 was ascribed to the presence of terminal hydroxyls, which was resulted from the adsorption and reaction between toluene and Pt-Al(OH) x ( Li et al., 2020 ; Zhao et al., 2020 ).…”

Revealing the Atomic Structures of Exposed Lateral Surfaces for Polymorphic Manganese Dioxide Nanowires

“…It is worth mentioning that, based on similar HRTEM results of MnO 2 nanowires along their radial direction, previous studies have directly ascribed the observed planes to be the exposed outmost facets and to be further responsible for specific functional properties. [ 13,22,23,25,28–31,33–35,42–46 ] Without direct axial imaging, the deduction of exposed lateral facets solely based on radial TEM imaging in these studies could be plagued by the random sample orientation and the unknown cross‐sectional shape of the nanowires. We further corroborate this statement as later discussed in Figure 4 showing the axial imaging of α‐MnO 2 nanowire, where α‐(310) planes observed via radial TEM imaging in Figure S1, Supporting Information, are not actually seen as the exposed lateral facets.…”

“…[ 11,20,21 ] To index the outmost lateral surfaces, researchers have mainly, if not solely, relied on high‐resolution transmission electron microscopy (HRTEM) to resolve the lateral lattice of single MnO 2 nanowire and to further index the exposed lateral {hkl} facets. [ 5,22–27 ] All these TEM studies imaged nanowires along their radial direction. The accuracy of radially projected TEM imaging in indexing the faceted lateral surfaces of one nanowire could be easily compromised, because any {hkl} plane parallel to the nanowire axis can be inaccurately identified as the lateral facet if it happens to be tilted to align parallel to the electron beam and thus clearly forms a lattice image.…”

“…The accuracy of radially projected TEM imaging in indexing the faceted lateral surfaces of one nanowire could be easily compromised, because any {hkl} plane parallel to the nanowire axis can be inaccurately identified as the lateral facet if it happens to be tilted to align parallel to the electron beam and thus clearly forms a lattice image. Consequently, although targeting the same phase, e.g., α‐MnO 2 nanowires, which are synthesized using a similar hydrothermal approach, various studies have identified the exposed lateral facet(s) to be either {200}, or {110}, or {310}, or {210}, or {211}, [ 5,22–35 ] increasing the uncertainty of the establishment of an accurate surface structure–property relationship.…”