Constructing AgCoOx with Steering Intermediate Coverage for Efficient Kinetic Promotion of Electrochemical-/Solar-Driven Water Splitting
The rational design of robust electrocatalysts in view of exceptional stability with fast kinetics toward the oxygen evolution reaction (OER) using a sustainable synthetic strategy is still underway. A simple wet chemical method is established to report Ag- and Co-based oxalate (Ag@CoC<sub>2&l...
محفوظ في:
| المؤلف الرئيسي: | |
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| مؤلفون آخرون: | , , , , |
| منشور في: |
2025
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| الموضوعات: | |
| الوسوم: |
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| الملخص: | The rational design of robust electrocatalysts in view of exceptional stability with fast kinetics toward the oxygen evolution reaction (OER) using a sustainable synthetic strategy is still underway. A simple wet chemical method is established to report Ag- and Co-based oxalate (Ag@CoC<sub>2</sub>O<sub>4</sub>) for catalyzing OER, which demands 291/241 mV (GC/NF) to reach 10 mA/cm<sub>geo</sub><sup>2</sup>, a reduction of 50 mV compared to CoC<sub>2</sub>O<sub>4</sub> with a Tafel slope of 68/60 mV dec<sup>–1</sup>, a chronopotentiometry stability of 12/100 h, and a Faradaic efficiency of 98%. The silverization improved the charge transport by reducing the resistance to increase <i>C</i><sub>dl</sub> from 1.02 mF cm<sup>–2</sup>, indicating abundant accessible catalytic sites. Further, the catalytic efficiency was manifested by calculating intrinsic and geometric activities. The mechanistic route was analyzed from proton reaction order (ρ<sub>RHE</sub>), suggesting a proton-decoupled electron transfer (PDET) process. The kinetic study via operando EIS of Ag@CoC<sub>2</sub>O<sub>4</sub> reveals enhanced OER kinetics, less resistance, and more conductivity, suggesting faster kinetics. Further, improved OER activity was strengthened by the Bode study at various potentials. The temperature-dependent analysis inferred that Ag@CoC<sub>2</sub>O<sub>4</sub> decreased the activation energy (5.39 kJ/mol) related to CoC<sub>2</sub>O<sub>4</sub> (16.32 kJ/mol). Besides, alkaline electrolyzers and solar cell-driven electrolyzers built with a Ag@CoC<sub>2</sub>O<sub>4</sub> anode achieve exceptional total water splitting efficiency (1.59 V @ 10 mA/cm<sub>geo</sub><sup>2</sup>), establishing the suitability for practical applications. The alternative process with a Ag@CoC<sub>2</sub>O<sub>4</sub> anode was used to produce zero-carbon green H<sub>2</sub> and was further used for value-added electrocatalysis, thereby showing economic benefits for enhanced water oxidation by exposing surface and bulk active centers for rapid electrolyte diffusion. |
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