Sajjadi Saeed, Schultz Thorsten, Douglas-Henry Danielle A, Dharmaraj Karuppasamy, Emerenciano Aline Alencar, Kaplan Can, Marks Noel, Exner Kai S, Nicolosi Valeria, Koch Norbert, Browne Michelle P
Helmholtz Young Investigator Group Electrocatalysis: Synthesis to Devices, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Str. 15, 12489 Berlin, Germany.
Centre for Functional and Surface Functionalized Glass, Alexander Dubček University of Trenčín, Trenčín 911 50, Slovakia.
ACS Appl Energy Mater. 2025 Jul 25;8(15):11313-11328. doi: 10.1021/acsaem.5c01467. eCollection 2025 Aug 11.
A critical step in realizing the vision of green hydrogen through water splitting is to design oxygen evolution reaction (OER) catalysts that showcase a good balance of activity and stability. This work reports the compositional tuning of a NiMoO material and then the subsequent varying of TiCT MXene with the NiMoO hybrid nanostructures as OER catalysts in alkaline media. In this work, the optimum NiMoO hybrid catalyst retained good stability over 24 h of chronopotentiometry on industrial relevant supports (Ni Felt) with an overpotential value of ca. 339 mV at 100 mA cm. Operando Raman spectroscopy revealed that catalytically active β-NiOOH species are formed during OER in NiMoO at lower overpotentials than for pure NiO and that a higher amount of the β-NiOOH was found in the 5% MXene loading. The ICP-OES analysis showed that Mo dissolution follows a volcano trend with MXene loading (peaking at 5 wt %) before decreasing at 10 wt %. Overall, these results hold great promises for rational design strategies for MXene-supported water oxidation catalysts in alkaline electrolytes.
通过水分解实现绿色氢能愿景的关键一步是设计出在活性和稳定性之间取得良好平衡的析氧反应（OER）催化剂。这项工作报道了对NiMoO材料进行成分调整，随后将TiCT MXene与作为碱性介质中OER催化剂的NiMoO混合纳米结构进行变化。在这项工作中，最佳的NiMoO混合催化剂在工业相关载体（镍毡）上进行24小时计时电位法测试时保持了良好的稳定性，在100 mA cm时过电位约为339 mV。原位拉曼光谱显示，在OER过程中，与纯NiO相比，NiMoO在较低过电位下形成了具有催化活性的β-NiOOH物种，并且在5% MXene负载量中发现了更高含量的β-NiOOH。电感耦合等离子体发射光谱（ICP-OES）分析表明，Mo的溶解随着MXene负载量呈现火山趋势（在5 wt%时达到峰值），然后在10 wt%时下降。总体而言，这些结果为碱性电解质中MXene负载的水氧化催化剂的合理设计策略带来了巨大希望。
