Pham Hong Hanh, Linh Do Chi, Ngo Tuyet Thi Anh, Oanh Vu Thi Kim, Khuyen Bui Xuan, Patil Supriya A, Tran Nhu Hoa Thi, Park Sungkyun, Im Hyunsik, Bui Hoa Thi, Shrestha Nabeen K
Institute of Materials Science, Vietnam Academy of Science and Technology, Hanoi, Vietnam.
Institute of Physic and Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam.
Dalton Trans. 2023 Sep 13;52(35):12185-12193. doi: 10.1039/d3dt02426a.
Developing effective electrocatalysts for the oxygen evolution reaction (OER) that are highly efficient, abundantly available, inexpensive, and environmentally friendly is critical to improving the overall efficiency of water splitting and the large-scale development of water splitting technologies. We, herein, introduce a facile synthetic strategy for depositing the self-supported arrays of 1D-porous nanoneedles of a manganese cobalt oxide (MnCoO: MCO) thin film demonstrating an enhanced electrocatalytic activity for OER in an alkaline electrolyte. For this, an MCO film was synthesized thermal treatment of a hydroxycarbonate film obtained from a hydrothermal route. The deposited films were characterized through scanning electron microscopy (SEM), X-ray diffractometry (XRD), energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). In contrast to a similar 1D-array of a pristine CoO (CO) nanoneedle film, the MCO film exhibits a remarkably enhanced electrocatalytic performance in the OER with an 85 mV lower overpotential for the benchmark current density of 10 mA cm. In addition, the MCO film also demonstrates long-term electrochemical stability for the OER in 1.0 M KOH aqueous electrolyte.
开发高效、储量丰富、价格低廉且环境友好的析氧反应（OER）电催化剂对于提高水分解的整体效率以及水分解技术的大规模发展至关重要。在此，我们介绍一种简便的合成策略，用于沉积锰钴氧化物（MnCoO: MCO）薄膜的一维多孔纳米针自支撑阵列，该阵列在碱性电解质中对OER表现出增强的电催化活性。为此，通过对水热法制备的羟基碳酸盐薄膜进行热处理来合成MCO薄膜。通过扫描电子显微镜（SEM）、X射线衍射（XRD）、能量色散X射线分析（EDX）、透射电子显微镜（TEM）和X射线光电子能谱（XPS）对沉积的薄膜进行表征。与原始CoO（CO）纳米针薄膜的类似一维阵列相比，MCO薄膜在OER中表现出显著增强的电催化性能，在10 mA cm的基准电流密度下过电位低85 mV。此外，MCO薄膜在1.0 M KOH水溶液电解质中对OER也表现出长期的电化学稳定性。
