Iron-based composite nanomaterials for eco-friendly photocatalytic hydrogen generation

Synergistic Effect of Co9S8 and FeS2 Inlaid on N-Doped Carbon Nanofibers toward a Bifunctional Catalyst for Zn–Air Batteries

“…As shown in Figure f–h, the TEM characterization further confirms that the Co 9 S 8 –FeS 2 @N-CNFs have the structure of carbon nanofibers loaded with nanoparticles. As depicted in Figures k,l, the nanoparticle exhibits an interplanar distance of 2.71 Å in the high-resolution TEM (HRTEM) images (Figure k), representing the (220) crystal plane of FeS 2 , , while the lattice spacing of 2.99 Å in the nanoparticle (Figure l) corresponds to the crystallographic plane (311), which agrees with the results of the XRD discussed in Figure a. The SAED pattern of Co 9 S 8 -FeS 2 @N-CNFs is displayed in Figure i.…”

“…Peng et al successfully prepared a three-dimensional Co 9 S 8 /WS 2 electrocatalyst with a porous array structure and showed good electrocatalytic activity during the HER and OER processes . We have found that iron-based sulfides are more environmentally friendly and rich in reserves than cobalt- and nickel-based materials, but there are few studies. − Therefore, it is desirable to explore the catalytic performance of iron-based sulfides. Previous studies have shown that pyrite (FeS 2 ) has catalytic properties for ORR and Co 9 S 8 has catalytic activity for OER. , To study the bifunctional catalyst, it is necessary to obtain a dual-function catalyst through rational design to allow Co 9 S 8 and FeS 2 to play a synergistic role.…”

Efficient Photocatalytic Charge Separation at Anatase–Hematite Heterojunctions with a Tuned Three-Dimensional Cocatalytic NiO Support

“…7 eV correspond to Ni 2p 3/2 and its satellite. ,, The four peaks thus observed for Ni 2p could be attributed to the presence of Ni 2+ , revealing the presence of NiO. , Furthermore, the deconvoluted spectra of O 1s (Figure e) exhibit three peaks. The peaks observed at 530.9, 532.7, and 534.5 eV correspond to the lattice O 2– species, −OH, and adsorbed H 2 O. ,,− Precisely, herein, O is characteristic of the metal-oxygen bonds. However, a relatively higher peak corresponding to the −OH bond of the NiO cocatalyst of the Fe 2 O 3 -TiO 2 @2%NiO is observed.…”

“…Over the past decades, various semiconductor systems including TiO 2 , ZnO, BiVO 4 , Fe 2 O 3 , CdS, Cu 2 O, and so forth have been applied for the construction of heterostructures. − Among them, Fe 2 O 3 -based photocatalytic systems have gained substantial attention owing to their favorable band gap characteristics, nontoxicity, low cost, and high stability . Our research group has previously reported different modifications and hybrids of iron/titanium-based photocatalytic systems via heterojunction engineering to enhance the redox reaction capability and charge separation efficiency. − However, it is mostly difficult for such hybrid systems to confirm the stability of cocatalysts employed, so that the overall performance and photocatalytic stability unveil much certain limitations.…”

Harvesting Vibration Energy for Efficient Cocatalyst-Free Sonocatalytic H2 Production over Magnetically Separable Ultra-Low-Cost Fe3O4

“…It is oxidized during the reaction, providing more reactive electrons to the system by consuming the holes created during water splitting and preventing their recombination with electrons, thereby ensuring continuous H 2 production. This oxidation process typically results in the formation of formaldehyde, formic acid, and other oxidation products [42][43][44][45][46][47][48][49]. Overall, the intricate interplay of sonoluminescence-induced activation, electron excitation, and sacrificial agent utilization collectively contribute to the efficient sonocatalytic production of hydrogen, highlighting the pivotal role of ultrasonic vibrations in driving catalytic reactions and unlocking the potential of Fe 3 O 4 -based materials for sustainable energy applications.…”