Efficient bifunctional electrocatalysts of V- and Co-substituted α-MnO₂ materials can be synthesized by one-pot hydrothermal reaction of ion-adducts V³⁺/Co²⁺−MnO₄⁻, leading to the successful substitution of both V and Co ions in the α-MnO₂ lattice. According to extended X-ray absorption fine structure analysis, the substituted V ion is stabilized in highly distorted local symmetry whereas the substituted Co ion has regular octahedral local environment. Both the V- and Co-substituted α-MnO₂ materials exhibit excellent bifunctional electrocatalytic functionalities with lowered overpotentials and enhanced current densities for oxygen evolution (OER) and oxygen reduction reactions (ORR), underscoring the beneficial role of cation substitution in enhancing the bifunctional electrocatalytic activity of α-MnO₂. The Co-substituted α-MnO₂ shows higher bifunctional oxygen electrocatalyst functionality than does the V-substituted homologue, which is attributable to the greater improvement of charge transfer kinetics upon the Co substitution than the V one. The poorer charge transfer property of V-substituted α-MnO₂ can be ascribed to highly distorted local symmetry of V ion, which is unfavorable for increasing band width and depressing bandgap energy. Taking into account many advantages of the oxides of V, Mn, and Co elements such as low price, rich abundance, and environmentally benignity, the present study underscores that the partial substitution of neighboring 3d metal ion having regular octahedral symmetry can provide an effective and environmental friendly way of optimizing the oxygen electrocatalytic activity of manganese oxide.

V-和高效的双功能电催化剂共同取代的α-MnO的_2种材料可以通过离子加合物Ⅴ的一锅水热反应来合成³⁺ /钴²⁺ -MnO ₄ ^- ，导致V和Co的成功的替换-MnO ₂晶格中的离子。根据扩展的X射线吸收精细结构分析，取代的V离子稳定在高度扭曲的局部对称性中，而取代的Co离子则具有规则的八面体局部环境。两个V-和Co取代α-MnO的₂材料表现出具有降低的超电势和增强的电流密度为氧演进（OER）和氧还原反应（ORR），强调阳离子取代在增强α-MnO的的双官能的电催化活性的有益的作用优异的双功能的电功能₂。共同取代的α-MnO的₂示出了更高的双官能氧电功能并不比V-取代的同系物，这归因于电荷转移动力学在所述钴置换大于v一个较大的改善。的较差的电荷转移性质V-取代α-MnO的₂可以归因于V离子高度扭曲的局部对称性，这不利于增加带宽和降低带隙能量。考虑到V，Mn和Co元素的氧化物的许多优点（如价格低，丰度高和环境友好），本研究强调，具有规则八面体对称性的相邻3d金属离子的部分取代可提供有效且稳定的优化锰氧化物的氧电催化活性的环保方法。