Engineering non-precious electrocatalysts with excellent water oxidation performance is imperative for developing renewable and clean energy. Herein, we realize the simultaneous morphology and phase transformation from α-MnO₂ nanorods, large-size MnOOH nanorods to MnOOH nanoparticles by adding different content of N-CDs in the synthesizing α-MnO₂ process. Benefitting from the unique structures, synergistic effect between Mn-based oxides/oxyhydroxides and N-CDs, various active oxide species and large specific surface areas, the as-prepared Mn-based oxides/[email protected] with different morphologies show excellent electrocatalytic performance for oxygen evolution reaction (OER) in 1.0 M KOH. Impressively, the large-size [email protected]_0.2 display high electrocatalytic performance with the overpotential of 302 mV to reach to 10 mA cm⁻² along with a Tafel slope of 51.3 mA dec⁻¹. More importantly, by coupling the [email protected]_0.2 with Pt/C for overall water splitting, a cell potential of merely 1.56 V is required to reach to 10 mA cm⁻². Additionally, in the process of stability studies, the key role of the (111) crystal plane in the catalytic process is established. Meanwhile, the [email protected]_0.2 also shows excellent stability for continuous 72 h chronopotentiometry test. The proposed strategy showed here represents a facile and suitable method for the simultaneous transformation of the morphology and phase of Mn-based oxides/oxyhydroxides with the assistance of N-CDs for efficient energy conversion.

设计具有出色水氧化性能的非贵金属电催化剂对于开发可再生和清洁能源至关重要。在此，我们实现了从α-MnO的同时形态和相变_2层通过在合成α-MnO的添加N-CDS的不同含量的纳米棒，大尺寸的MnOOH纳米棒的MnOOH纳米颗粒_2点的过程。得益于独特的结构，锰基氧化物/羟基氧化物与N-CD的协同效应，各种活性氧化物种类和较大的比表面积，所制备的具有不同形态的锰基氧化物/ [受电子邮件保护]显示出优异的电催化性能。在1.0 M KOH中用于氧气释放反应（OER）。令人印象深刻的是，大尺寸[电子邮件保护] _0.2显示出高电催化性能，过电势为302 mV，达到10 mA cm ^-2，Tafel斜率为51.3 mA dec ^-1。更重要的是，通过将[受电子邮件保护的] _0.2与Pt / C耦合以进行总的水分解，仅需要1.56 V的电池电势即可达到10 mA cm ^-2。此外，在稳定性研究过程中，（111）晶面在催化过程中的关键作用得以确立。同时，[电子邮件保护] _0.2连续72小时计时电位测试也显示出出色的稳定性。此处显示的拟议策略代表了一种便捷且合适的方法，借助N-CD可以同时转变Mn基氧化物/羟基氧化物的形态和相，从而实现有效的能量转换。