Tan Lidan, Wang Jiapei, Zhou Sheng, Zhu Hui, Guo Jianguang, Chen Yongting, Li Xuanke, Dong Zhijun, Zhang Qin, Cong Ye
The State Key Laboratory of Refractories and Metallurgy, Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials, Wuhan University of Science and Technology, Wuhan 430081, PR China.
The State Key Laboratory of Refractories and Metallurgy, Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials, Wuhan University of Science and Technology, Wuhan 430081, PR China.
J Colloid Interface Sci. 2025 Jul;689:137263. doi: 10.1016/j.jcis.2025.137263. Epub 2025 Mar 7.
The development of stable, efficient and cost-effective electrocatalysts is crucial for overcoming the sluggish kinetics of the oxygen evolution reaction (OER) in electrochemical splitting water. Ni-Fe layered bimetallic phosphides (NiFe-P) exhibit considerable promise as electrocatalysts for OER. However, their limited conductivity and low inherent activity present significant challenges. Herein, we design a novel NiFe-P/TiCT composite, synthesized by hydrothermally coupling NiFe-LDH nanosheets with few-layer TiCT MXene, followed by high-temperature phosphating. By optimizing the Ni/Fe ratio and controlling the phosphidation process, the NiFe-P/TiCT catalyst demonstrates enhanced activity and stability for OER in alkaline media, achieving a low overpotential of 290 mV and a Tafel slope of 72.3 mV/dec at a current density of 10 mA cm. Theoretical calculations reveal that synergistic effect of the Ni-Fe bimetallic system optimizes the local electronic environment of the phosphides, while defect sites provide additional active centers, boosting intrinsic activity. Furthermore, the high conductivity of TiCT and the three-dimensional interconnected porous network accelerate charge transfer kinetics. This work underscores the substantial development potential of MXene-based electrocatalysts in advancing novel and efficient materials for OER.
开发稳定、高效且具有成本效益的电催化剂对于克服电化学水分解中析氧反应（OER）缓慢的动力学至关重要。镍铁层状双金属磷化物（NiFe-P）作为OER的电催化剂展现出了巨大的潜力。然而，它们有限的导电性和较低的固有活性带来了重大挑战。在此，我们设计了一种新型的NiFe-P/TiCT复合材料，通过将NiFe-LDH纳米片与少层TiCT MXene进行水热耦合合成，随后进行高温磷化处理。通过优化Ni/Fe比例并控制磷化过程，NiFe-P/TiCT催化剂在碱性介质中对OER表现出增强的活性和稳定性，在电流密度为10 mA cm时实现了290 mV的低过电位和72.3 mV/dec的塔菲尔斜率。理论计算表明，Ni-Fe双金属体系的协同效应优化了磷化物的局部电子环境，而缺陷位点提供了额外的活性中心，提高了固有活性。此外，TiCT的高导电性和三维互连多孔网络加速了电荷转移动力学。这项工作强调了基于MXene的电催化剂在开发新型高效OER材料方面的巨大发展潜力。
