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A dual-channel optical fiber sensor based on surface plasmon resonance for heavy metal ions detection in contaminated water
摘要： Transition metal phosphides (TMPs) have recently emerged as an important type of electrode material for use in supercapacitors thanks to their intrinsically outstanding specific capacity and high electrical conductivity. Herein, we report the synthesis of bimetallic CoxNi1?xP ultrafine nanocrystals supported on carbon nanofibers (CoxNi1?xP/CNF) and explore their use as positive electrode materials of asymmetric supercapacitors. We find that the Co:Ni ratio has a significant impact on the specific capacitance/capacity of CoxNi1?xP/CNF, and CoxNi1?xP/CNF with an optimal Co:Ni ratio exhibits an extraordinary specific capacitance/capacity of 3514 F g?1/1405.6 C g?1 at a charge/discharge current density of 5 A g?1, which is the highest value for TMP-based electrode materials reported by far. Our density functional theory calculations demonstrate that the significant capacitance/capacity enhancement in CoxNi1?xP/CNF, compared to the monometallic NiP/CNF and CoP/CNF, originates from the enriched density of states near the Fermi level. We further fabricate a flexible solid-state asymmetric supercapacitor using CoxNi1?xP/CNF as positive electrode material, activated carbon as negative electrode material, and a polymer gel as the electrolyte. The supercapacitor shows a specific capacitance/capacity of 118.7 F g?1/166.2 C g?1 at 20 mV s?1, delivers an energy density of 32.2 Wh kg?1 at 3.5 kW kg?1, and demonstrates good capacity retention after 10000 charge/discharge cycles, holding substantial promise for applications in flexible electronic devices.
关键词： cobalt phosphide,high specific capacitance,transition metal phosphide,nickel phosphide,asymmetrical supercapacitor
更新于2025-09-11 14:15:04
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Boosting Photoelectrochemical Water Oxidation with Cobalt Phosphide Nanosheets on Porous BiVO4
摘要： Modification of semiconductor surface by cobalt-rich catalysts is an effective strategy to improve the photoelectrochemical (PEC) water oxidation kinetics and migration of photogenerated electron and hole. In this study, cobalt phosphide (CoP) nanosheet was integrated on the nanoporous bismuth vanadate (BiVO4) electrode by using the hydrothermal method. The introduction of CoP significantly improved the PEC performance of the photoanode, with a photocurrent up to 4.0 mA cm-2 at 1.23 V (versus RHE) under simulated 100 mW cm-2 irradiation, a three-fold enhancement over that obtained by the bare BiVO4. The BiVO4+CoP photoanode exhibited an impressive early onset of water oxidation, with a more than 220 mV cathodic shift of the onset potential, superior to the typical Co3O4 and Co-Pi cocatalysts modified BiVO4 photoanode. Systematic studies show that the improvement in PEC performance by CoP is mainly due to the restraint of surface charge recombination and increase in photovoltage.
关键词： photoelectrochemical,cobalt phosphide,water oxidation,bismuth vanadate (BiVO4),photoanode
更新于2025-09-10 09:29:36