Wang Shihao, Li Ming, Tang Haolin, Zhang Haining
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, Hubei, 430070, China.
National Energy Key Laboratory for New Hydrogen-Ammonia Energy Technologies, Foshan Xianhu Laboratory, Foshan, Guangdong, 528200, China.
Small. 2025 Mar;21(11):e2411397. doi: 10.1002/smll.202411397. Epub 2025 Feb 2.
Anion exchange membrane water electrolysis (AEMWE) employing Ir/Ru-free anodes emerges as a bright prospect for green hydrogen society. Here, a NiFeMnSe nanosheet electrocatalyst is reported, in situ grown on stainless-steel paper, as an efficient and durable self-supporting AEMWE anode for oxygen evolution reaction (OER). The interstitial [MnSe] tetrahedra elevate the Fermi level and narrows the band gap of the electrocatalyst, thereby expediting electrode reaction kinetics and increasing the electrical conductivity. In addition, the interstitial Mn atoms attenuate the electron density of Ni and Fe and motivate phase transition to actual active (Mn, Fe)-doped γ-NiOOH species. The downward d-band center of Ni active center facilitates the rate-limiting OOH desorption step, refreshing the active center, and reducing the free energy barriers for OER. Accordingly, the NiFeMnSe electrode achieves OER overpotentials of 149 and 232 mV at 10 and 100 mA cm in 1 m KOH. The AEMWE cell incorporating NiFeMnSe anode demonstrates high performance (1.0 A cm at 1.68 V) and durability (at 1 A cm for 300 h), surpassing most AEMWE cells that use NiFe-based anodes. This work highlights the potential of noble-metal-free anodes for efficient and durable AEMWE.
采用无铱/钌阳极的阴离子交换膜水电解（AEMWE）在绿色氢能社会中展现出光明前景。在此，报道了一种原位生长在不锈钢纸上的NiFeMnSe纳米片电催化剂，作为用于析氧反应（OER）的高效且耐用的自支撑AEMWE阳极。间隙[MnSe]四面体提高了费米能级并缩小了电催化剂的带隙，从而加快电极反应动力学并提高电导率。此外，间隙锰原子减弱了镍和铁的电子密度，并促使相转变为实际活性的（锰，铁）掺杂γ-NiOOH物种。镍活性中心向下的d带中心促进了限速的OOH脱附步骤，更新了活性中心，并降低了OER的自由能垒。因此，NiFeMnSe电极在1 m KOH中，在10和100 mA cm时实现了149和232 mV的OER过电位。包含NiFeMnSe阳极的AEMWE电池表现出高性能（在1.68 V时为1.0 A cm）和耐久性（在1 A cm下持续300小时），超过了大多数使用镍铁基阳极的AEMWE电池。这项工作突出了无贵金属阳极在高效且耐用的AEMWE方面的潜力。
