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In this paper, we synthesized Bi 2 Se 3 -NFs@rGO composite and analyzed electro chemical properties. Bi 2 Se 3 -NFs@rGO composite improved specific capacity, cycle stability and ion conductivity by rGO composite. [Display omitted] • The synthesis of Bi 2 Se 3 nanoflakes(NFs) by organic molecules as selenium precursor. • Synthesized homogenously nanoflakes by oleylamine as surfactant. • Bi2Se3-NFs@rGO composite exhibits high specific capacity compared to previous articles. • Analyzed the mechanism of Bi 2 Se 3 -NFs@rGO composite via Ex-situ TEM and Ex-situ XRD. Metal selenides have gained attention as alternative anode materials for lithium-ion batteries, with increasing demand for electro-vehicles and appliances. Bismuth selenide has significant potential as anode materials in lithium-ion batteries. Nevertheless, metal selenides have essential drawbacks, such as volume expansion and poor cycle performance. In this paper, bismuth selenide synthesized homogeneous morphology-like nanoflakes (NFs) using the wet chemical method. We combined these nanoflakes with reduced graphene oxide to improve their structural stability. The Bi 2 Se 3 -NFs@rGO composite showed enhanced specific capacity from 750 mAhg−1 to 1100 mAhg−1 at 100 mAg−1. Furthermore, at a current density of 500 mAg−1, it reached a specific capacity (819 mAhg−1) after 300 cycles and demonstrated a coulombic efficiency of 96 %. [ABSTRACT FROM AUTHOR]

[Display omitted] • MIL-53(Fe)/metal (Ni, Co, Mn)-phenolic network nanoarchitectures were fabricated for OER. • MIL-53(Fe)/Ni-phenolic network nanoarchitectures revealed the best electrochemical performance due to interface effect. • This work supplied an efficient approach for water splitting. The interface nature of composite catalysts affected drastically the oxygen evolution reaction (OER) behavior. In this paper, nanoarchitecture consisted of Fe-based metal–organic frameworks (MIL-53) and metal-phenolic networks were created. Metal (Mn2+, Co2+, and Ni2+) phenolic networks were assembled on the surface of MIL-53 to form heterostructures. Among them, MIL-53(Fe)/Ni-phenolic network nanoarchitectures revealed the best electrochemical performance. The existence of MIL-53 enhanced the adsorption ability for OH− in the nanoarchitectures. The electron transfer between MIL-53 and Ni-phenolic networks adjusted the filling degree of e g orbitals to optimize the bonding strength between Fe3+/Ni2+ and oxygen intermediate species. MIL-53/Ni-phenolic networks nanoarchitectures exhibited well OER performance with a potential of 282 mV at 10 mA cm−2. This work provided an efficient insight into the structure-properties relation of a promising heterostructure catalyst for water splitting. [ABSTRACT FROM AUTHOR]