Systematic Investigation of the Role of Molybdenum and Boron in NiCo-Based Alloys for the Oxygen Evolution Reaction

Systematic Investigation of the Role of Molybdenum and Boron in NiCo-Based Alloys for the Oxygen Evolution Reaction

Quaternary NiCoMoB electrocatalysts exhibited significantly enhanced OER performance compared to their ternary NiCoMo and NiCoB counterparts. An optimal Mo/B ratio of 1 (NiCoMo<sub>y</sub>B<sub>y</sub>) demonstrated a superior OER activity, attributed to a balance between the...

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Bibliographic Details
Main Authors: Parastoo Mouchani, Donald W. Kirk, Steven J. Thorpe
Format: Article
Language:English
Published: MDPI AG 2025-04-01
Series:Molecules
Subjects:
oxygen evolution reaction (OER)
electrocatalyst
stability
high-energy surfactant-assisted ball milling (HE-SABM)
mechanical alloying
cryo-milling
Online Access:https://www.mdpi.com/1420-3049/30/9/1971
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Summary:Quaternary NiCoMoB electrocatalysts exhibited significantly enhanced OER performance compared to their ternary NiCoMo and NiCoB counterparts. An optimal Mo/B ratio of 1 (NiCoMo<sub>y</sub>B<sub>y</sub>) demonstrated a superior OER activity, attributed to a balance between the electronic and structural contributions from Mo and B, maximizing the electrocatalytic site density and activity. NiCoMo<sub>y</sub>B<sub>y</sub>-SA, a nanoparticle version synthesized via a surfactant-assisted method, showed further improved performance. The OER activity was evaluated by comparing overpotentials at 10 mA/cm<sup>2</sup>, with NiCoMo<sub>x</sub>B<sub>1−x</sub>, NiCoMo<sub>y</sub>B<sub>y</sub>, and NiCoMo<sub>y</sub>B<sub>y</sub>-SA exhibiting 293, 284, and 270 mV, respectively. NiCoMo<sub>y</sub>B<sub>y</sub>-SA also demonstrated the lowest onset potential (1.45 V), reflecting a superior efficiency. Chronoamperometry in 1 M pre-electrolyzed KOH at 30 °C highlighted NiCoMo<sub>y</sub>B<sub>y</sub>-SA’s stability, activating within hours at 10 mA/cm<sup>2</sup> and stabilizing over 7 days. At 50 mA/cm<sup>2</sup>, the overpotential increased minimally (0.02 mV/h over 2 days), and even at 100 mA/cm<sup>2</sup> for 10 days, the activity declined only slightly, affirming a high stability. These findings demonstrate NiCoMoB electrocatalysts as cost-effective, efficient OER electrocatalysts, advancing sustainable energy technologies.
ISSN:1420-3049

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