ACS Applied Energy Materials, Journal Year: 2024, Volume and Issue: 8(1), P. 430 - 441

Published: Dec. 30, 2024

In the current scenario of energy crisis and environmental concerns, oxygen evolution reaction (OER) electrocatalysts are vital importance for their application in metal–air batteries efficient water splitting to produce hydrogen. The best possible OER considered be noble metal-based materials like RuO2 IrO2, but high cost instability have prevented wider use large-scale splitting. Here, we envisaged CrPO4 as a cost-efficient host due formation CrO6 octahedra interconnected through PO4 linkage, making it stable framework structure harness eg electrons that pinned over O(2p) orbital, required superior activity. presence more electronegative Fe3+ or Cr3+ sites structure, inductive effect, enhances iconicity Cr–O bond framework, creation CrO42– groups at surface catalyst directly facilitates adsorption/desorption OH– form –Cr–O–OH, which reduces overpotential with higher structural stability electrocatalyst. turn, Cr0.9Fe0.1PO4 demonstrated electrocatalytic activity toward alkaline electrolyte, together low 292 mV 10 mA cm–2 density Tafel slope 49 dec–1, better than well-known electrocatalyst RuO2. Enhanced was observed feasibility 3-electron transfer Cr3+/6+ redox there significant increase peak Cr6+ also strong overlap between Cr(3d) orbitals, generates charge from bands resulting reduction lower overpotential.

Language: Английский