Mouchani Parastoo, Kirk Donald W, Thorpe Steven J
Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, ON M5S 3E5, Canada.
Department of Materials Science and Engineering, University of Toronto, Toronto, ON M5S 3E4, Canada.
Molecules. 2025 Apr 29;30(9):1971. doi: 10.3390/molecules30091971.
Quaternary NiCoMoB electrocatalysts exhibited significantly enhanced OER performance compared to their ternary NiCoMo and NiCoB counterparts. An optimal Mo/B ratio of 1 (NiCoMoB) 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. NiCoMoB-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, with NiCoMoB, NiCoMoB, and NiCoMoB-SA exhibiting 293, 284, and 270 mV, respectively. NiCoMoB-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 NiCoMoB-SA's stability, activating within hours at 10 mA/cm and stabilizing over 7 days. At 50 mA/cm, the overpotential increased minimally (0.02 mV/h over 2 days), and even at 100 mA/cm 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.
与三元NiCoMo和NiCoB对应物相比，四元NiCoMoB电催化剂表现出显著增强的析氧反应（OER）性能。1的最佳Mo/B比（NiCoMoB）表现出优异的OER活性，这归因于Mo和B在电子和结构贡献之间的平衡，使电催化位点密度和活性最大化。通过表面活性剂辅助方法合成的纳米颗粒版本NiCoMoB-SA表现出进一步改善的性能。通过比较在10 mA/cm²时的过电位来评估OER活性，NiCoMoB、NiCoMoB和NiCoMoB-SA的过电位分别为293、284和270 mV。NiCoMoB-SA还表现出最低的起始电位（1.45 V），反映出其卓越的效率。在30°C下于1 M预电解KOH中进行的计时电流法突出了NiCoMoB-SA的稳定性，在10 mA/cm²下数小时内即可活化，并在7天内保持稳定。在50 mA/cm²时，过电位增加极小（2天内为0.02 mV/h），甚至在100 mA/cm²下持续10天，活性仅略有下降，证实了其高稳定性。这些发现表明NiCoMoB电催化剂是具有成本效益、高效的OER电催化剂，推动了可持续能源技术的发展。
