TY - JOUR AB - In the quest for alternate and efficient electrode materials, ternary metal electrocatalysts (TMEs), part of the perovskite family, were synthesized and tested for methanol electro-oxidation in alkaline media. La0.5Ca0.5MO3 (M = Ni, Co, or Mn) was synthesized via sol-gel method. X-ray diffraction analysis revealed that the perovskite crystal structure possesses characteristic sharp and crystalline peaks for all synthesized ternary electrocatalysts. The average particle size calculated using Debye–Scherrer equation was in the order of La0.5Ca0.5NiO3 (LCNO) > La0.5Ca0.5CoO3 (LCCO)> La0.5Ca0.5MnO3 (LCMO). The elemental composition of as prepared sample, LCCO was investigated via x-ray fluorescence spectroscopy. The qualitative and quantitative analysis revealed the presence of La, Ca and Co in parent crystal structure with percentage compositions of 9.0, 3.12 and 87.82% respectively. The particle size distribution was homogenous, as determined by scanning electron and transmission electron microscopes. The electrocatalytic activity of the synthesized ternary electrocatalysts was studied electrochemically by cyclic voltammetry. The calculated diffusion coefficient values showed that electrode surface of LCNO and LCCO have limited efficiency for diffusion related phenomenon. The heterogeneous rate constants inferred better electrode kinetics of LCCO and LCNO which exhibited good electrocatalytic behavior; sharp anodic peaks were observed in the potential range of +0.3 to 0.6 V and +0.6 to 0.8 V, respectively. Methanol electro-oxidation was found minimal in case of LCMO sample. We have observed that Co substitution at B-site of perovskite electrode materials attains better electrochemical properties, thus in relation with reported literature. AU - Hussain, Tayyaba AU - Nauman, Muhammad AU - Sabahat, Sana AU - Arif, Saira ID - 9069 IS - 12 JF - Materials Research Express KW - Electronic KW - Optical and Magnetic Materials KW - Surfaces KW - Coatings and Films KW - Polymers and Plastics KW - Metals and Alloys KW - Biomaterials SN - 2053-1591 TI - Synthesis of ternary electrocatalysts for exploration of methanol electro-oxidation in alkaline media VL - 6 ER - TY - JOUR AB - By rigorously accounting for mesoscale spatial correlations in donor/acceptor surface properties, we develop a scale-spanning model for same-material tribocharging. We find that mesoscale correlations affect not only the magnitude of charge transfer but also the fluctuations—suppressing otherwise overwhelming charge-transfer variability that is not observed experimentally. We furthermore propose a generic theoretical mechanism by which the mesoscale features might emerge, which is qualitatively consistent with other proposals in the literature. AU - Grosjean, Galien M AU - Wald, Sebastian AU - Sobarzo Ponce, Juan Carlos A AU - Waitukaitis, Scott R ID - 8101 IS - 8 JF - Physical Review Materials KW - electric charge KW - tribocharging KW - soft matter KW - granular materials KW - polymers SN - 2475-9953 TI - Quantitatively consistent scale-spanning model for same-material tribocharging VL - 4 ER - TY - JOUR AB - Advances in shape-morphing materials, such as hydrogels, shape-memory polymers and light-responsive polymers have enabled prescribing self-directed deformations of initially flat geometries. However, most proposed solutions evolve towards a target geometry without considering time-dependent actuation paths. To achieve more complex geometries and avoid self-collisions, it is critical to encode a spatial and temporal shape evolution within the initially flat shell. Recent realizations of time-dependent morphing are limited to the actuation of few, discrete hinges and cannot form doubly curved surfaces. Here, we demonstrate a method for encoding temporal shape evolution in architected shells that assume complex shapes and doubly curved geometries. The shells are non-periodic tessellations of pre-stressed contractile unit cells that soften in water at rates prescribed locally by mesostructure geometry. The ensuing midplane contraction is coupled to the formation of encoded curvatures. We propose an inverse design tool based on a data-driven model for unit cells’ temporal responses. AU - Guseinov, Ruslan AU - McMahan, Connor AU - Perez Rodriguez, Jesus AU - Daraio, Chiara AU - Bickel, Bernd ID - 7262 JF - Nature Communications KW - Design KW - Synthesis and processing KW - Mechanical engineering KW - Polymers SN - 2041-1723 TI - Programming temporal morphing of self-actuated shells VL - 11 ER - TY - JOUR AU - Bléger, David AU - Klajn, Rafal ID - 13379 IS - 1 JF - Macromolecular Rapid Communications KW - Materials Chemistry KW - Polymers and Plastics KW - Organic Chemistry SN - 1022-1336 TI - Integrating macromolecules with molecular switches VL - 39 ER -