Lanthanum-based double perovskite nanoscale motifs as support media for the methanol oxidation reaction

Abstract

We have correlated the performance of double perovskite metal oxides as support media for the methanol oxidation reaction (MOR) with their intrinsic size, shape, and composition.

Yttrium-based Double Perovskite Nanorods for Electrocatalysis

“…While most work for MOR or EOR has focused on single perovskites, our group has recently reported that the observed activity is correlated with chemical composition. In fact, we noted that Ni-containing perovskites, such as LaNiO 3 and La 2 NiMnO 6 , were able to achieve comparable activities for MOR and outperformed both LaMnO 3 and the Pt/C standard when these lanthanum-based perovskites were used as supports for Pt nanoparticles . Interestingly, we also observed that anisotropic nanorods achieved a noticeably higher MOR performance as compared with nanocubes possessing a similar size, all else being equal.…”

Unraveling the Structural, Dielectric, Magnetic, and Optical Characteristics of Nanostructured La2NiMnO6 Double Perovskites

“…It is widely accepted that the physical properties are strongly influenced by B-site cation disordering, which has a strong correlation with the selection of synthesis routes [ 10 ]. Up to date, various synthetic methods have been developed to synthesize nanostructured LNMO materials, such as but not limited to the solid-state reaction method [ 3 , 10 , 32 , 33 , 34 ], sol-gel process [ 20 , 29 , 35 , 36 , 37 ], gel combustion method [ 38 , 39 ], co-precipitation method [ 40 , 41 ], Pechini method [ 9 , 15 ], molten salt method [ 42 , 43 , 44 ], ionic coordination reaction method [ 45 ], and hydrothermal method [ 46 , 47 ]. Despite the sol-gel process being commonly used in the literature for the synthesis of LNMO NPs, this technique often suffers from being out of control over morphology, and yields poorly-defined NPs.…”

“…In contrast, highly uniform LNMO NRs with an average diameter of ∼20 nm and length of ~120 nm (aspect ratio = 6.0) were synthesized by using a two-step hydrothermal procedure, where the organic surfactant cetyltrimethylammonium bromide (CTAB) was used as a capping agent [ 46 ]. Very recently, both LNMO nanocubes with sizes in the range of ~70 to 400 nm and LNMO NRs with average diameters of ~50 nm were synthesized by using a surfactant-less hydrothermal method [ 47 ]. It is found that the LNMO NRs have a 1.5-fold increase in the methanol oxidation reaction activity compared to LNMO NPs.…”

“…It is found that the LNMO NRs have a 1.5-fold increase in the methanol oxidation reaction activity compared to LNMO NPs. However, currently, only a few works on the hydrothermal synthesis of nanostructured LNMO are reported [ 46 , 47 ]. In parallel with the experimental investigations of LNMO DP oxide, theoretical calculations by using the Density Functional Theory (DFT) are also performed to understand the structural, electronic, and magnetic properties of the LNMO [ 48 , 49 ].…”

Ultrafine Rh nanocrystals immobilized on 3D boron and nitrogen co-doped graphene–carbon nanotube networks: high-efficiency electrocatalysts towards the methanol oxidation reaction

“…[1][2][3][4] Direct methanol fuel cells (DMFCs), as a green power generation device that can directly convert chemical energy into electrical energy, play an increasingly important role in daily life. 5,6 In particular, DMFCs have been considered to be a very promising power source in the fields of portable electronic devices, electric vehicles, and aerospace crafts because of their high energy conversion efficiency, wide working temperature range, environmental friendliness, and structural safety. 7,8 As the core component of DMFCs, electrocatalysts effectively enhance the inherently slow kinetics of the anode during the methanol oxidation reaction (MOR), which can contribute directly to the output power density of the fuel cell.…”