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Unique NiFe-LDH nanoflowers functionalized with electron-withdrawing anion intercalation and surface sulfurization were fabricated, and show superior electrocatalytic activity for the oxygen evolution reaction.

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The synthesis of a new compound, amide-linked manganese diporphyrin xanthene (Mn 2 Cl 2 ADPX), and its application for preparation of thiocyanate selective electrodes was described. The electrode was prepared with a PVC membrane combining Mn 2 Cl 2 ADPX as an electro active material, 2-nitrophenyl octyl ether (o-NPOE) as a plasticizer in the percentage ratio of 3 : 65 : 32 (Mn 2 Cl 2 ADPX: o-NPOE: PVC, w : w : w). The electrode exhibited linear response within the concentration range of 2.4 Â 10 À6 to 1.0 Â 10 À1 M SCN À , with a working pH range from 3.0 to 8.0 and a fast response time of less than 60 s. Several electroactive materials and solvent mediators have been compared and the experimental conditions were optimized. The Mn 2 Cl 2 ADPX based electrode shows obviously better response characteristics than that of monoporphyrin manganese in terms of working concentration range and slope. Selectivity coefficients for SCN À relative to a number of interfering ions were investigated. The electrode exhibits antiHofmeister selectivity toward SCN À with respect to common coexisting anions. The electrode was applied to the determination of SCN À in body urine with satisfactory results.