Core-shell structure of MOFs and NiTe: synergistic approach for enhanced electrocatalysis in water splitting Hafiza Komal Zafar, Umair Ali Asif, Manzar Sohail NUST, Pakistan Metal-organic frameworks (MOFs) exhibit promising potential for various applications owing to their high specific surface area (SSA) and efficient synergistic interactions. Developing MOF-based electrocatalysts is crucial for advancing commercial water splitting. In this study, we employ a surface modification technique to prepare a novel core-shell structure, where, MOFs serve as the core material with dispersed Ni particles encompassed by a protective shell of Ni10Te8. The combination of MOFs and Ni10Te8 in a core-shell configuration offers synergistic and surface interface effects, leading to exceptional bifunctional activity for water splitting. The Ni MOF/Ni@Ni10Te8 catalyst demonstrates a low overpotential of 99 mV and 180 mV vs RHE@10 mA cm-2 for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively, with remarkable stability (99%) even after 15 hours. Moreover, in seawater, the Ni MOF/Ni@ Ni10Te8 required a low overpotential of 440 mV at 10 mA cm-2 to produce 70 mL of hydrogen and 34 mL of oxygen with remarkable Faradaic efficiencies of 95.7% and 92.9%, respectively. For practical applications, we have investigated water splitting in poised industrial water and seawater showcasing a promising synergistic approach to address environmental pollution and energy sustainability using efficient and economically viable electrocatalysts. References 1. Zhang, Y., et al., Design of modified MOFs electrocatalysts for water splitting: High current density operation and long-term stability. Applied Catalysis B: Environmental, 2023. 336: p. 122891. 2. Cheng, W., et al., Versatile Polydopamine Platforms: Synthesis and Promising Applications for Surface Modification and Advanced Nanomedicine. ACS Nano, 2019. 13(8): p. 8537-8565. 3. Zuo, B., et al., Recent Advances in the Synthesis, Surface Modifications and Applications of Core-Shell Magnetic Mesoporous Silica Nanospheres. Chemistry – An Asian Journal, 2020. 15(8): p. 1248-1265. 4. Takata, T., et al., Fabrication of a Core–Shell-Type Photocatalyst via Photodeposition of Group IV and V Transition Metal Oxyhydroxides: An Effective Surface Modification Method for Overall Water Splitting. Journal of the American Chemical Society, 2015. 137(30): p. 9627-9634. 5. Lin, Z.-Z., et al., Surface/interface influence on specific heat capacity of solid, shell and core-shell nanoparticles. Applied Thermal Engineering, 2017. 127: p. 884-888. 6. Wang, H., et al., Exploiting Core–Shell Synergy for Nanosynthesis and Mechanistic Investigation. Accounts of Chemical Research, 2013. 46(7): p. 1636-1646. 7. Wang, P. and B. Wang, Designing Self-Supported Electrocatalysts for Electrochemical Water Splitting: Surface/Interface Engineering toward Enhanced Electrocatalytic Performance. ACS Applied Materials & Interfaces, 2021. 13(50): p. 59593- 59617. 8. Sivanantham, A., et al., Nanostructured core-shell cobalt chalcogenides for efficient water oxidation in alkaline electrolyte. Electrochimica Acta, 2019. 312: p. 234-241. 9. Ye, B., et al., Interface engineering for enhancing performance of additive-free NiTe@NiCoSe2 core/shell nanostructure for asymmetric supercapacitors. Journal of Power Sources, 2021. 506: p. 230056. 10. Zahra, R., et al., A review on nickel cobalt sulphide and their hybrids: Earth abundant, pH stable electro-catalyst for hydrogen evolution reaction. International Journal of Hydrogen Energy, 2020. 45(46): p. 24518-24543.
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