Trimetallic Prussian blue analogue derived FeCo/FeCoNi@NPC composites for highly efficient microwave absorption

Two Birds with One Stone: Broadband Electromagnetic Wave Absorption and Anticorrosion Performance in 2–18 GHz for Prussian Blue Analog Derivatives Aimed for Practical Applications

“…For NiCoFe@C, as depicted in Figure 3f as oxidation states of Ni (854.16 and 871.65 eV), Co (779.18 and 794.66 eV), and Fe (711.20, and 714.44 eV). [8] These results confirm that the Ni, Co, and Fe had been reduced from the PBA to form the alloys, which is consistent with the above TEM and XRD results. Meanwhile, the oxidation state of metal elements illustrates that the surfaces of alloy nanoparticles are slightly oxidized in air, which is common in MOF-derived materials.…”

“…The high‐resolution spectrum of Ni 2p, Co 2p, and Fe 2p (Figure S4o–q, Supporting Information) indicate that Ni, Co, and Fe elements can be categorized as metallic state of Ni (853.16 and 870.63 eV), Co (778.62 and 793.39 eV), and Fe (707.51 and 720.31 eV), as well as oxidation states of Ni (854.16 and 871.65 eV), Co (779.18 and 794.66 eV), and Fe (711.20, and 714.44 eV). [ 8 ] These results confirm that the Ni, Co, and Fe had been reduced from the PBA to form the alloys, which is consistent with the above TEM and XRD results. Meanwhile, the oxidation state of metal elements illustrates that the surfaces of alloy nanoparticles are slightly oxidized in air, which is common in MOF‐derived materials.…”

“…The magnetic moments of Ni, Co, and Fe atoms increase in the order of Ni < Co < Fe, which lead to the saturation magnetization ( M s ) values of NiCo@C, NiFe@C, NiCoFe@C, and CoFe@C increasing sequentially, which measured as ≈57.23, ≈80.96, ≈108.18, and ≈ 111.86 emu g −1 , respectively. [ 8 ] In addition, the larger content of diamagnetic carbon also weakened the M s values to some extent. The high M s values make absorbers magnetized easily and respond more rapidly to external electromagnetic fields, thereby facilitating EM wave consumption by the rotation of the magnetic domain.…”

“…[6,7] However, these magnetic metal particles usually suffer from the disadvantages such as poor impedance matching, high density, poor dispersity, and easy corrosion, which seriously restrict their applications. [3,8] Magnetic carbonbased composites are a promising candidate as an effective strategy to address the above problems considering their low density, tunable properties, and chemical stability. Meanwhile, owing to its impermeability and chemical stability, graphitic carbon has been proposed as a perfect atomic-scale barrier to prolong the path of penetration of corrosive media (such as H 2 O, O 2 , and Cl − ) into metal substrates.…”

Porous FeNi Prussian blue cubes derived carbon-based phosphides as superior sulfur hosts for high-performance lithium–sulfur batteries

“…The reason for the surface becoming rough and the size reduction may be the removal of cyanide and interstitial water molecules during the heating process [39]. The SEM image in figure 1(e) indicates that FeNiP/A-C is composed of numerous nanoparticles together with an obvious agglomeration phenomenon, which may be due to the formation of nanoparticles due to the nonequilibrium interdiffusion process of metal atoms during high-temperature carbonization in an inert atmosphere [40]. The SEM image in figure 1(f) shows some nanocubes and fragments of crosslinked structures in FeNiP/A-S, which indicates that vulcanization can cause the precursor to slight collapse during the vulcanization process [41].…”