Robust and Highly Efficient Electrocatalyst Based on Zif-67 and Ni2+ Dimers for Oxygen Evolution Reaction: In Situ Mechanism Insight

Modulation and engineering of MOF-derived transition metal selenides/NiFe LDH for application in electrocatalytic hydrogen evolution

“…The Ni-Co-Se@NiFe LDH/NF (0.19 U) exhibited a lower charge transfer resistance (R ct ) than that of NiFe LDH/NF (0.56 U), Ni-Co-Se/NF (1.56 U), RuO 2 /NF (8.83 U), and NF (58.88 U), implying that Ni-Co-Se@NiFe LDH/NF has the highest charge transfer efficiency during the oxygen evolution reaction due to the synergistic effect between NiFe LDH and Ni-Co-Se. The double-layer capacitance (C dl ) values of the prepared catalysts were evaluated by cyclic voltammetry (CV) at different scanning rates (20,40,60, 80, 100 mV s −1 ) in the non-faradaic region (Fig. S6 †).…”

“…Based on the aforementioned ndings, the incorporation of ZIF-derived Ni-Co-Se with NiFe LDH led to a synergistic enhancement in the electrochemical performance of the catalyst. This synergistic effect can be attributed to: 10,20,25 (i) the presence of advantageous OER active species from NiFe LDH in conjunction with HER active species from metallic metal-Se species; (ii) the enhanced specic surface area and increased exposure of active sites due to the hierarchical triangular column microstructure, thereby providing an enlarged ECSA and accelerated mass and charge transfer process; (iii) the superhydrophilic nature of the Ni-Co-Se@NiFe LDH/NF electrode enables deep electrolyte penetration, fostering intimate interaction between the electrolyte and the active sites on the catalyst surface, thereby ensuring prompt release of the generated O 2 and H 2 gases; (iv) the efficacious collaboration of…”

“…15 Additionally, Zhou et al engineered vanadiumdoped Ni 3 S 2 nanorod arrays on the surface of nickel foam through a hydrothermal method, subsequently depositing NiFe LDH nanosheets on the nanorod surface using an electrodeposition method, resulting in a material exhibiting remarkable catalytic activity with an overall hydrolysis current density of 10 mA cm −2 achievable at a potential of merely 1.55 V. 16 In recent years, metal-organic frameworks (MOFs) have been regarded as effective precursors for the fabrication of porous or hollow structural materials owing to their adjustable physicochemical properties. [17][18][19][20] Furthermore, MOF derivatives are deemed promising electrocatalysts due to their distinct attachment of metal ions, organic ligands, controllable structure, and tunable nanopore characteristics. [21][22][23][24][25] Li et al successfully synthesized a distinctive core-double-shell nanostructured compound, Co 9 S 8 @Co 9 S 8 @MoS 2 -0.5, with a metal-organic backbone ZIF-67 as a precursor, exhibiting outstanding electrocatalytic activities for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER).…”

ZIF-67-derived Co–N–C supported nickel cobalt sulfide as a bifunctional electrocatalyst for sustainable hydrogen production via alkaline electrolysis

“…Significant research efforts have focused on exploring cost-effective catalysts for OER and HER, spanning a wide range of materials, including transition metal alloys, hydroxides, oxyhydroxides, oxides, sulfides, nitrides, selenides, carbides, phosphides, oxysulphides, borides, hydroxide carbonates, hydroxyl phosphates, and various carbon-based materials. 4,6,[8][9][10][11] Given that an alkaline medium is less corrosive compared to strong acidic conditions, considerable attention has been directed towards developing efficient and durable bifunctional electrocatalysts suitable for both the OER and HER in an alkaline environment. In this context, materials based on transition metals from the 3d series hold special significance owing to their low cost, abundance, and facile synthesis.…”

“…In this context, materials based on transition metals from the 3d series hold special significance owing to their low cost, abundance, and facile synthesis. 6,[9][10][11] In recent times, MOFs have emerged as valuable templates for generating a diverse range of materials through additional processing. The utilization of MOFs as a template offers a versatile and tunable platform for creating advanced materials with enhanced properties, making them particularly attractive for various applications in science and technology.…”