Ye Lin, Chen ZhiPeng, Xu Xinyue, Ma Fei, Fan Kaicai, Zong Lingbo, Wang Lei, Chen Guanjun, Li Xingwei, Zhan Tianrong
Key Laboratory of Optic-Electric Sensing and Analytical Chemistry for Life Science (Ministry of Education), College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
Inorg Chem. 2024 Oct 28;63(43):20859-20869. doi: 10.1021/acs.inorgchem.4c03660. Epub 2024 Oct 11.
Quick and easy synthetic methods and highly efficient catalytic performance are equally important to anodic oxygen evolution reaction (OER) electrocatalysts for alkaline seawater electrolysis. Herein, we report a facile one-step route to in situ growing PO intercalated NiFe layered double hydroxides (NiFe-LDH) on Ni foam (denoted as NiFe-P/NF) by a room-temperature immersion for several minutes. This ultrafast approach transforms the NF surface into a rough PO intercalated NiFe-LDH overlayer, which demonstrates outstanding OER performance in both alkaline simulated and natural seawaters owing to good hydrophilic interface and the electrostatic repulsion of PO against Cl anions. Density functional theory calculations reveal that the intercalated PO can not only promote electron transfer but also prevent Cl from entering the interlayer and simultaneously inhibit the migration of Cl over the NiFe-LDH surface. In alkaline simulated and natural seawater electrolytes, NiFe-P/NF needs low overpotentials of 248 and 298 mV to achieve a current density of 100 mA cm, respectively. NiFe-P/NF can stably run over 42 h in an alkaline high-salty electrolyte (1 M KOH + 2.5 M NaCl) at 250 mA cm, more than 70 times that of NiFe/NF (0.6 h), emphasizing the critical role of the intercalated PO anions on the excellent durability. This study offers a new strategy to modify commercial NF to prepare efficient and stable OER catalysts for seawater electrolysis.
对于碱性海水电解的阳极析氧反应（OER）电催化剂而言，快速简便的合成方法和高效的催化性能同样重要。在此，我们报道了一种简便的一步法，通过室温浸泡几分钟，在泡沫镍（记为NiFe-P/NF）上原位生长磷酸根插层的镍铁层状双氢氧化物（NiFe-LDH）。这种超快方法将泡沫镍表面转变为粗糙的磷酸根插层的NiFe-LDH覆盖层，由于良好的亲水界面以及磷酸根对氯离子的静电排斥作用，该覆盖层在碱性模拟海水和天然海水中均表现出出色的析氧反应性能。密度泛函理论计算表明，插层的磷酸根不仅可以促进电子转移，还能防止氯离子进入层间，同时抑制氯离子在NiFe-LDH表面的迁移。在碱性模拟海水和天然海水电解质中，NiFe-P/NF分别需要248和298 mV的低过电位来实现100 mA cm的电流密度。NiFe-P/NF在碱性高盐电解质（1 M KOH + 2.5 M NaCl）中，在250 mA cm下可稳定运行超过42小时，是NiFe/NF（0.6小时）的70多倍，突出了插层磷酸根阴离子对优异耐久性的关键作用。本研究提供了一种新策略，用于改性商用泡沫镍，以制备用于海水电解的高效稳定的析氧反应催化剂。
