Meenu Preetha Chandrasekharan, Kothoori Naga Pranava Sree, Dahiya Preeti, Mandal Tapas Kumar, Roy Sounak
Department of Chemistry, Birla Institute of Technology and Science Pilani, Hyderabad Campus, Hyderabad, 500078, India.
Department of Chemistry, School of Science, GITAM University, Hyderabad, 502329, India.
Chem Asian J. 2025 Apr 17;20(8):e202401520. doi: 10.1002/asia.202401520. Epub 2025 Feb 20.
Nickel-based molybdates have attracted considerable attention owing to their distinctive isomorphous structure. In this study, pristine NiMoO and Co-doped NiCoMoO were synthesized and investigated for their electrocatalytic activity in methanol oxidation and methanol-assisted water splitting reactions. Through a comprehensive exploration of the structure-property relationship, it was found that the optimal coexistence of α and β molybdate phases, induced by Co doping, led to lattice strain and facilitated the presence of essential catalytic descriptors such as higher oxidation states of Ni and surface oxygen vacancies within the lattice. These factors contributed to the enhanced electrocatalytic activity of NiCoMoO in methanol oxidation and hydrogen evolution reaction. Detailed kinetic studies were conducted to further elucidate the mechanisms involved. Overall, these findings highlight the promising potential of NiCoMoO as an effective catalyst for electrochemical methanol upgrading in conjunction with water splitting, with implications for sustainable energy conversion technologies.
镍基钼酸盐因其独特的同构结构而备受关注。在本研究中，合成了原始的NiMoO和Co掺杂的NiCoMoO，并研究了它们在甲醇氧化和甲醇辅助水分解反应中的电催化活性。通过对结构-性能关系的全面探索，发现Co掺杂诱导的α和β钼酸盐相的最佳共存导致晶格应变，并促进了诸如Ni的更高氧化态和晶格内表面氧空位等基本催化描述符的存在。这些因素有助于提高NiCoMoO在甲醇氧化和析氢反应中的电催化活性。进行了详细的动力学研究以进一步阐明其中涉及的机制。总体而言，这些发现突出了NiCoMoO作为电化学甲醇升级与水分解相结合的有效催化剂的潜在前景，对可持续能源转换技术具有重要意义。
