Electrocatalytic oxygen evolution by synergistically coupling layered double hydroxide Ni-based with MXene

Md Ishak, Nurul Atiqah Izzati and Rahman, Saidur and Abdullah, Norulsamani and Zainoodin, Azran Mohd and Pandey, Adarsh Kumar and Tan, Kim Han and Zaed, Md Abu (2025) Electrocatalytic oxygen evolution by synergistically coupling layered double hydroxide Ni-based with MXene. IOP Conference Series: Earth and Environmental Science, 1560 (1): 012059. ISSN 1755-1307

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Abstract

Electrolysis presents a cost-effective and environmentally friendly approach for producing carbon-neutral hydrogen, addressing global environmental challenges. However, the slow kinetics of the oxygen evolution reaction (OER) pose a significant obstacle in many sustainable energy conversion processes. In this study, a novel two-dimensional (2D) Ti3C2Tx MXene substrate was used to hybridize with Mo-doped NiCo phosphate nanostructures through a two-step hydrothermal process followed by phosphating calcination, resulting in a low-cost and efficient electrocatalyst. The porous, defect-rich Ti3C2Tx flakes provide metal-like electrical conductivity and a large surface area, supporting the direct growth of active species and improving their catalytic performance for the OER. The synthesized Ni1Co1Mo0·125Px/MXene exhibited an overpotential of 314.6 mV at 10 mA cm−2 and a Tafel slope of 77 mV dec−1, with an electrochemical double-layer capacitance (Cdl) of 7.1 μF cm−2 corresponding to a large electrochemically active surface area (ECSA). Electrochemical impedance spectroscopy (EIS) confirmed a low charge-transfer resistance, while chronoamperometry (CA) stability tests demonstrated robust long-term durability under continuous operation. This unique nanostructure enhances electrocatalytic activity due to the synergistic effects between the metal components, offering improved performance for the oxygen evolution reaction.