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CoPi/Co(OH)2 Modified Ta3N5 as New Photocatalyst for Photoelectrochemical Cathodic Protection of 304 Stainless Steel
摘要： In this work, CoPi and Co(OH)2 nanoparticles were deposited on the surface of Ta3N5 nanorod-arrays to yield a novel broad-spectrum response photocatalytic material for 304 stainless steel photocatalytic cathodic protection. The Ta3N5 nanorod-arrays were prepared by vapor-phase hydrothermal (VPH) and nitriding processes and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-Vis spectroscopy, respectively, to obtain morphologies, crystal structures, surface compositions, and light response range. In order to analyze the performance improvement mechanism of CoPi/Co(OH)2 on Ta3N5 nanorod-arrays, the electrochemical behavior of modi?ed and unmodi?ed Ta3N5 was obtained by measuring the open circuit potential and photocurrent in 3.5 wt% NaCl solution. The results revealed that the modi?ed Ta3N5 material better protects 304 stainless steel at protection potentials reaching ?0.45 V.
关键词： CoPi/Co(OH)2 modi?cation,cathodic protection,Ta3N5 nanorod-arrays,photocatalysis
更新于2025-09-23 15:22:29
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Composition analysis of Ta <sub/>3</sub> N <sub/>5</sub> /W <sub/>18</sub> O <sub/>49</sub> nanocomposite through XPS
摘要： A characterization of a nanocomposite material consisting of Ta3N5 nanoparticles and W18O49 nanowires is presented. The material is of interest for photocatalytic applications, with a focus on pollution reduction through the photodegradation of dye waste; under white light illumination, the combination of Ta3N5 and W18O49 yielded an enhanced rate of dye degradation relative to Ta3N5 particles alone. The facile method of synthesis is thought to be a promising route for both upscale and commercial utilization of the material. X-ray photoelectron spectroscopy revealed a core–shell composite structure with W18O49 present as an overlayer on Ta3N5; the analyzed spectra for the C 1s, O 1s, Ta 4f, N 1s, W 4f, and Na 1s regions are reported. It should be noted that due to differential charging of the underlying Ta3N5 component relative to the W18O49 shell, an additional uncompensated voltage shift may exist in the Ta 4f and N 1s spectra.
关键词： x-ray photoelectron spectroscopy,XPS,dye degradation,W18O49,nanowires,composite,Ta3N5,photocatalysis
更新于2025-09-23 15:21:21
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On the processes of photo-induced hydrogen generation from methanol solution by Ta3N5 and?WO3
摘要： The hydrogen production rates from deionized water and 20% methanol solution, with or without the presence of Ta3N5, WO3, and the indirect Z-scheme Ta3N5/WO3, were investigated. Under irradiation of a 300 W Xe lamp, all of these three catalysts assisted hydrogen generation in deionized water. In the methanol solution, Ta3N5, and WO3 reduced the hydrogen generation, but Ta3N5/WO3 signi?cantly enhanced the hydrogen production rate by seven times. Under visible light irradiation, the effects of the three catalysts are different from those under full spectrum irradiation. The mechanisms based on the competition of methanol decomposition and water reduction in the presence of catalyst under different irradiation conditions are proposed to explain the different hydrogen generation behaviors.
关键词： WO3,Sacri?cial reagent,Photocatalytic hydrogen evolution,Methanol,Ta3N5
更新于2025-09-23 15:21:01
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Incorporation of K<sup>+</sup> and Al<sup>3+</sup> during the formation of Ta<sub>3</sub>N<sub>5</sub> with heat-treatment of Ta<sub>2</sub>O<sub>5</sub>–AlN mixtures without flowing ammonia
摘要： A tantalum(V) nitride (Ta3N5)-containing powder for non-toxic red pigments was prepared by heat-treatment for the mixed powders of tantalum(V) oxide (Ta2O5), aluminum nitride and potassium fluoride in nitrogen atmosphere without flowing ammonia. The foreign ions of K+ and Al3+ were incorporated into Ta3N5 in the synthetic process. The incorporation of the ions had an influence on the hue of Ta3N5. It can coordinate a reddish color of Ta3N5 pigments.
关键词： Tantalum nitride,Pigment,Non-toxic,Al,Color,Incorporation,Ta3N5,K
更新于2025-09-23 15:21:01
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Ta <sub/>3</sub> N <sub/>5</sub> /Co(OH) <sub/>x</sub> composites as photocatalysts for photoelectrochemical water splitting
摘要： Ta3N5 nanotubes (NTs) were obtained from nitridation of Ta2O5 NTs, which were grown directly on Ta foil through a 2-step anodization procedure. With Co(OH)x decoration, a photocurrent density as high as 2.3 mA cm?2 (1.23 V vs. NHE) was reached under AM1.5G simulated solar light; however, the electrode suffered from photocorrosion. More stable photoelectrochemical (PEC) performance was achieved by first loading Co(OH)x, followed by loading cobalt phosphate (Co–Pi) as double co-catalysts. The Co(OH)x/Co–Pi double co-catalysts may act as a hole storage layer that slows down the photocorrosion caused by the accumulated holes on the surface of the electrode. A “waggling” appearance close to the “mouth” of Ta2O5 NTs was observed, and may indicate structural instability of the “mouth” region, which breaks into segments after nitridation and forms a top layer of broken Ta3N5 NTs. A unique mesoporous structure of the walls of the Ta3N5 NTs, which is reported here the first time, is also a result of the nitridation process. We believe that the mesoporous structure makes it difficult for the nanotubes to be fully covered by the co-catalyst layer, hence rationalizing the remaining degradation by photocorrosion.
关键词： photoelectrochemical water splitting,photocorrosion,Co–Pi,Co(OH)x,mesoporous structure,Ta3N5 nanotubes
更新于2025-09-04 15:30:14