| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
2025 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-31: Vanadium-Stabilized MoB Nanoparticles for Enhanced Hydrogen Evolution at High Current Densities |
| Author(s) |
Sang Bum Kim, Johan Yapo, Akira Yasuhara, Kunio Yubuta, Boniface P.T. Fokwa |
| On-Site Speaker (Planned) |
Sang Bum Kim |
| Abstract Scope |
Molybdenum borides electrocatalysts have shown promise as cost-effective alternatives to platinum-based ones for the hydrogen evolution reaction (HER), particularly under harsh industrial conditions requiring high current densities. However, the electrode preparation method differs from that of Pt/C, rendering a proper activity comparison difficult. In this work, we report the synthesis of vanadium-stabilized molybdenum monoboride (V0.3Mo0.7B) nanoparticles that outperform Pt/C at industrially relevant current densities under the same experimental conditions, achieving 1000 mA/cm2 with an overpotential of only 0.452 V compared to 0.837 V for the commercial 20% Pt/C benchmark. Our Density Functional Theory calculations demonstrate that V0.31Mo0.69B exhibits improved Gibb’s free energy for HER (ΔGH = -0.12 eV) under high hydrogen coverages (80 to 100%), showcasing its superior catalytic activity at high current densities. Stability tests showed that the V0.3Mo0.7B electrode remains robust (97% retention) after ~28 hours at 1000 mA/cm2, making it a compelling candidate for sustainable hydrogen production. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Energy Conversion and Storage, Nanotechnology, Composites |