Song Wenyu, Xia Chenfeng, Zaman Shahid, Chen Shenghua, Xiao Chunhui
Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, School of Chemistry, Xi'an Jiaotong University, Xi'an, 710049, China.
School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology (HUST), 1037 Luoyu Rd, Wuhan, 430074, China.
Small. 2024 Nov;20(48):e2406075. doi: 10.1002/smll.202406075. Epub 2024 Sep 23.
Alkaline electrolysis plays a crucial role in sustainable energy solutions by utilizing electrolytic cells to produce hydrogen gas, providing a clean and efficient method for energy storage and conversion. Efficient, stable, and low-cost electrocatalysts for the oxygen evolution reaction (OER) are essential to facilitate alkaline water electrolysis on a commercial scale. Nickel-iron-based (NiFe-based) transition metal electrocatalysts are considered the most promising non-precious metal catalysts for alkaline OER due to their low cost, abundance, and tunable catalytic properties. Nevertheless, the majority of existing NiFe-based catalysts suffer from limited activity and poor stability, posing a significant challenge in meeting industrial applications. This also highlights a common situation where the emphasis on material activity receives significant attention, while the equally critical stability aspect is often underemphasized. Initiating with a comprehensive exploration of the stability of NiFe-based OER materials, this article first summarizes the debate surrounding the determination of active sites in NiFe-based OER electrocatalysts. Subsequently, the degradation mechanisms of recently reported NiFe-based electrocatalysts are outlined, encompassing assessments of both chemical and mechanical endurance, along with essential approaches for enhancing their stability. Finally, suggestions are put forth regarding the essential considerations for the design of NiFe-based OER electrocatalysts, with a focus on heightened stability.
碱性电解通过利用电解槽生产氢气，在可持续能源解决方案中发挥着关键作用，为能量存储和转换提供了一种清洁高效的方法。用于析氧反应（OER）的高效、稳定且低成本的电催化剂对于推动碱性水电解的商业化规模至关重要。镍铁基过渡金属电催化剂因其低成本、丰富性和可调节的催化性能，被认为是用于碱性OER最有前景的非贵金属催化剂。然而，大多数现有的镍铁基催化剂存在活性有限和稳定性差的问题，这对满足工业应用构成了重大挑战。这也凸显了一种常见情况，即对材料活性的重视受到了极大关注，而同样关键的稳定性方面却常常被忽视。本文从对镍铁基OER材料稳定性的全面探索入手，首先总结了围绕镍铁基OER电催化剂活性位点确定的争论。随后，概述了最近报道的镍铁基电催化剂的降解机制，包括对化学和机械耐久性的评估，以及提高其稳定性的基本方法。最后，针对镍铁基OER电催化剂的设计提出了基本考虑建议，重点是提高稳定性。
