RESUMEN
Ternary metal-element alloys have been reported as efficient electrocatalysts toward various electrochemical reactions, but a unique three-dimensional (3D) Ir-alloyed ternary nanosheet-composed flower (NCF) structure has not been explored yet. Herein, an innovated 1.8 nm Ir-alloyed ultrathin ternary PdIrCu NCF structure is synthesized via one-pot solvothermal reduction without using any surfactant. The as-prepared PdIrCu/C NCF catalyst remarkably improves the stability than commercial Pd/C toward formic acid electrooxidation while resulting in significantly increased mass activity. The improvement of electrocatalytic properties depends on the introduction of Ir and Cu atoms, which greatly prevented poisoning from CO while modifying the electronic structure of Pd for increased reaction active sites and accelerated charge-transfer rate as well as facilitated mass transport by ultrathin NCF 3D structure. Therefore, this catalyst possesses a promising application prospect in electrochemical energy storage/conversion systems.
RESUMEN
A pot experiment with conventional maize cultivar ZD958 and glutinous maize cultivar JN218 was conducted to study the effects of applying different concentrations (0, 10, 25 and 50 mg x kg(-1)) of selenium (Se) on the Se allocation in plant organs, grain yield, and its quality. At low concentrations (< or = 10 mg x kg(-1)), Se stimulated maize growth, and increased biomass accumulation and grain yield significantly. At high concentrations (> 25 mg x kg(-1)), Se inhibited maize growth, and decreased dry mass accumulation, grain yield, and its quality. The Se concentration in plant organs was in the order of root > leaf > stalk > sheath. The Se concentrations in plant organs had a positive correlation with the Se concentration in soil. Comparing with ZD958, JN218 could accumulate more Se in natural low-Se environment, but enrich lesser Se in the environment with 10 mg x kg(-1) of Se. Taking the Se accumulation amount in grain and aboveground vegetative organs as the standard for evaluation, JN218 was more available planted on natural low-Se (0.25 mg x kg(-1)) soil or high-Se (25 mg x kg(-1)) soil, while ZD958 was appropriate planted on Se-rich (10 mg x kg(-1)) soil or Se-polluted (50 mg x kg(-1)) soil.