No abstract

In this work, a few-layered MoSe 2 on Ti 3 C 2 T x MXene (MoSe 2 /Ti 3 C 2 T x ), obtained via a simple one-step hydrothermal synthesis and thermal annealing, is investigated for its potential application as an active electrochemical nitrogen reduction reaction (eNRR) catalyst. The MoSe 2 /Ti 3 C 2 T x catalyst achieved an NH 3 yield rate of 56.96 μg h −1 mg cat −1 at −0.50 V vs RHE and a Faradic efficiency (FE) of 14.08% at −0.35 V vs RHE with remarkable electrochemical stability. Meanwhile, the density functional theory (DFT) calculations suggest that Mo atoms are active sites for eNRR, and the distal pathway is the preferred route for NH 3 formation on MoSe 2 /Ti 3 C 2 T x . KEYWORDS: electrocatalysts, N 2 reduction reaction, Ti 3 C 2 T x MXene, few-layer MoSe 2 , density functional theory

Poor cyclability and rate performance always impedet he development of transition metal phosphidebased anode materials. Many strategies have been used to addresst he above problems, such as the designing of hierarchicals tructures,c ombination with carbon materials, and doping with other metal elements. Considering thoses trategies, af lower-like Fe-doped CoP material is designed. The synthesis consists of microsheets grown on ac arbon membrane (CM, leaves as precursor) through ah ydrothermal methoda nd in situ phosphorization.T he Fe dopinga nd carbon membrane synergistically induce the formationo fa flower-like hierarchical microstructure duringt he crystalgrowingp rocess. The unique hierarchical microstructure in-creases thec ontact area between electrode and electrolyte, and accommodates the volume expansion duringc ycling. The hierarchicalF e-doped CoP grownd irectly on the carbon membrane increases the active sites for intercalation of sodiums pecies and furtherp romotes the internal electron conduction in the Fe-doped CoP/CM electrode. Thereby,t he Fe-doped CoP/CM as the anode electrode fors odium ion batteries exhibits ah igh specific capacityo f5 15 mA hg À1 at 100 mA g À1 after 100 cycles. Even if the current density rises to 500 mA g À1 ,t he specific capacity is stillm aintained at 324 mA hg À1 after 500 cycles, showings uperior rate performances and cyclability.

No abstract

No abstract