Electrically driven phosphorus dissolution from iron-nickel phosphate surfaces exposing highly active sites for oxygen evolution reaction.

The enhancement of catalytic activity can be achieved by removing non-active components from the surface of catalyst materials, thereby increasing the accessibility of active sites. In this study, an electrically driven method is described for the removal of non-active phosphorus (P) to optimize the surface composition of iron-nickel phosphide (denoted as P-O-NFF), resulting in the exposure of more active Fe-Ni sites for oxygen evolution reaction (OER). The optimized P-O-NFF electrode exhibits exceptional OER catalytic activity, with an overpotential of 217 mV at 10 mA cm.

A facile strategy for preparation of strong tough poly(lactic acid) foam with a unique microfibrillated bimodal micro/nano cellular structure.

This work reports the design and fabrication of strong tough poly(lactic acid) (PLA) foam by combining pressure-induced-flow (PIF) processing with supercritical CO foaming. PIF processing widened the foaming window of PLA to 40-120 °C, while supercritical CO foaming released the undesired internal stress of PLA samples with PIF processing (P-PLA). The prepared PLA foams displayed a unique microfibrillated bimodal micro/nano cellular structure which is strongly affected by saturation temperature (T).

Two Tb-metal organic frameworks with different metal cluster nodes for CH/CO separation.

Through regulating the reaction solvent and temperature, two Tb-based metal-organic frameworks, ((CH)NH)[Tb(μ-OH)(μ-OH)(PTB)]·(DMF)·(HO) (1) and ((CH)NH){[Tb(μ-O)(μ-OH)(HO)][Tb(μ-O)(HCO) (PTB)]}·(DMF)·(HO) (2) (HPTB = pyridine-2,4,6-tribenzoic acid), have been synthesized. Structural analysis showed that the cluster node of 1 is a Tb cluster, while 2 contains two different nodes of a Tb cluster and a Tb cluster, which leads to their different pore structures and may potentially separate CH/CO. Gas adsorption demonstrates that both MOFs can separate CH and CO, but 2 has a more optimized pore environment than 1 and can exhibit better selective separation of CH/CO.

The effect of polytetrafluoroethylene particle size on the properties of biodegradable poly(butylene succinate)-based composites.

Poly(butylene succinate) (PBS)/polytetrafluoroethylene (PTFE) composites, including three types of PTFE powders, were prepared by melt blending using a HAAKE torque rheometer. Microcellular foams were successfully fabricated by batch foaming with supercritical fluids (scCO). The effects of PTFE powder type on crystallization, rheological properties and foaming behavior were studied.

Superior Impact Toughness and Excellent Storage Modulus of Poly(lactic acid) Foams Reinforced by Shish-Kebab Nanoporous Structure.

Poly(lactic acid) (PLA) foams, with the combination of shish-kebab and spherulite nanoporous structure in skin and core layer respectively, was prepared using a novel technique comprising loop oscillating push-pull molding (LOPPM) and supercritical carbon dioxide low-temperature foaming process (SC-COLTFP). The foams present superior impact toughness which is 6-fold higher than that of neat PLA, and no significant decrease was observed for the storage modulus. Moreover, SC-COLTFP at soaking temperature ranging from 110 to 150 °C were performed to determine the evolution of pore morphology.