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Experimental Result Paper | Chemical Engineering | India | Volume 13 Issue 10, October 2024 | Popularity: 4.9 / 10

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Unlocking Prussian Blue Analogues: Enhancing Multimetallic Composition in Layered Double Hydroxides for Next-Gen Electrochemical Water Splitting

Manoj Kumar, Raghvendra Pratap Singh

Abstract: The electrochemical water splitting is as a beacon of hope for future oxygen demands and sustainable energy solution. The oxygen evolution reaction (OER) experiences a sluggish kinetics due to simultaneous four-electron proton transfer reaction. The efficiency of this process hinges significantly the material used in reaction. Thus, the efficiency of electrochemical water splitting hindered and requires high potential. Herein In this regard, a series of electrocatalysts have been explored for electrochemical OER with high catalytic activity and stability. Herein, we have explored the high entropy Prussian blue analogue (HEPBA = MnFeCoNiCu-PBA) by simple solvothermal method for the electrochemical OER in alkaline medium. The multi-metallic composition, enhanced synergistic effect, and modulated structural and electronic properties provide the excellent OER activity, faster reaction kinetics, and stability. As a result, HEPBA showed the impressive OER activity at 260 mV overpotential to afford 10 mA cm-2 current density, lower than that of synthesized tetra-metallic (4-PBA), trimetallic (3-PBA), and bimetallic (2-PBA) analogue. Moreover, the high electrochemical surface area, lower charge transfer resistance and enhanced stability for 24 h have also recorded for HEPBA. Further, the electrochemical reconstruction of HEPBA has been established by spectroscopy and microscopy to form the active layered metal hydroxide-(oxy)hydroxide catalyst under anodic potential.

Keywords: High entropy Prussian blue analogue; electrochemical reconstruction; ultrathin LDH nanosheets; synergistic effect; oxygen evolution

Edition: Volume 13 Issue 10, October 2024

Pages: 36 - 44

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