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Fe5C2 particle is a promising magnetic material, but there are few reports on pure phase Fe5C2 particle with adjustable morphology. Herein, pure phase Fe5C2 magnetic materials with different morphologies were prepared by a simple ethylenediamine carbonization method. This method included the preparation of FeC2O4·2H2O precursors with different morphologies and the co-calcination process of ethylenediamine and the precursors. At the same time, the optimum experimental conditions for the formation of pure phase Fe5C2 particles with different morphologies were investigated. More importantly, the magnetic properties of Fe5C2 particles and the electrocatalytic activities of Fe5C2 particles as electrocatalysts for the hydrogen evolution reaction (HER) are improved by adjusting the morphologies of Fe5C2 particles. The saturation magnetization (Ms) and coercivity (Hc) of Fe5C2 particle with the cuboid rod-like structure can reach 134.53 emu/g and 305.93 Oe, respectively, demonstrating good soft magnetic properties at 298 K. Simultaneously, the Fe5C2 particle with the porous cuboid rod-like structure exhibits efficient HER activity (225 mV for j = − 10 mA cm−2). In this work, a simple and generalized Fe5C2 particle synthesis method is proposed, and new explorations are provided for the further applications of Fe5C2 particles with different morphologies in the fields of magnetism and catalysis. [ABSTRACT FROM AUTHOR]

Herein, the Fe3C nanoparticles encapsulated in carbon nanotubes (Fe3C/CNTs) were successfully prepared through a simple method using g‐C3N4 from thermal polymerization of melamine. The structure, morphology and magnetic properties of the prepared samples were investigated by various technologies. The results show that the Fe3C nanoparticles encapsulated in carbon nanotubes exhibit good magnetic properties with high saturated magnetization (83.7 emu g−1). Importantly, this simple approach provides a way to synthesize metal carbides encapsulated in carbon nanotubes. [ABSTRACT FROM AUTHOR]

Sm3+ ions doped orange-red emitting AlN phosphors were successfully fabricated by a simple solid-state route at 880 °C. The phase analysis and crystal structure, symmetry, morphology, band gap width, elements analysis and photoluminescence properties are investigated detailly. The symmetry of the local environment for Sm3+ depends on the doping concentration of Sm3+ ions in AlN matrix. All the phosphors can exhibit orange-red emission by virtue of the 4G5/2 → 6H7/2 transition of Sm3+ ions. And all the phosphors display high color purity and low correlated color temperature. The best doping concentration of Sm3+ in AlN matrix is 1.0% mole fraction. Furthermore, in contrast to undoped AlN, AlN:xSm3+ semiconductors show excellent photocatalytic hydrogen evolution activity, and the maximum rate of H2 evolution from water splitting is 98 μmol h−1 g−1 when the doping concentration of Sm3+ is 1.3% mole fraction. The study signifys bifunctional AlN:xSm3+ with luminescence and photocatalytic properties may be anticipated to apply in both white light-emitting diodes (WLEDs) and photocatalytic hydrogen evolution from water splitting. [ABSTRACT FROM AUTHOR]

Herein, cubic iron carbides encapsulated in an N-doped carbon shell (ICs@NC) were prepared by a simple two-step method. The two-step method included the preparation of iron oxalate dihydrate and the process of calcination with ethylenediamine. By changing the calcination temperature, we could control the type of iron carbide formed. Moreover, the prepared iron carbide@N-doped carbon core–shell particles exhibited regular cubic shapes and soft magnetic properties with high saturation magnetization. More importantly, we investigated the electrocatalytic activity of the iron carbide@N-doped carbon catalysts for the hydrogen evolution reaction (HER). The results show that the Fe5C2–Fe3C@NC catalyst has efficient HER catalytic activity with an overpotential of 209 mV@10 mA cm−2. [ABSTRACT FROM AUTHOR]

The Fe3N nanoparticles with different Mn concentration were fabricated by a co-precipitation method. The structure and morphology of these as-prepared samples were carefully investigated. And we infer that the incorporation of Mn influence on the stability of Fe3N. Moreover, we explore the magnetic properties of Fe3N with different Mn concentration from vibrating sample magnetometer and analyze the reasons for the change of magnetic properties. The results demonstrate that our synthetic route provides a new way to explore the properties and structure of Fe3N incorporated with different transition metals. [ABSTRACT FROM AUTHOR]

Herein, cubic iron carbides encapsulated in an N-doped carbon shell (ICs@NC) were prepared by a simple two-step method. The two-step method included the preparation of iron oxalate dihydrate and the process of calcination with ethylenediamine. By changing the calcination temperature, we could control the type of iron carbide formed. Moreover, the prepared iron carbide@N-doped carbon core-shell particles exhibited regular cubic shapes and soft magnetic properties with high saturation magnetization. More importantly, we investigated the electrocatalytic activity of the iron carbide@N-doped carbon catalysts for the hydrogen evolution reaction (HER). The results show that the Fe5C2-Fe3C@NC catalyst has efficient HER catalytic activity with an overpotential of 209 mV@10 mA cm-2.