Overcoming the dilemma between hydrogen permeability and stability is critical for realizing the widespread application of mixed protonic–electronic conducting (MPEC) membranes. Herein, fluoride-anion doping is for the first time reported for tuning the separation performance of MPEC membranes. Lanthanum tungstate oxyfluoride membranes, La_5.5W_0.6Mo_0.4O_11.25−δF_x (x = 0, 0.025, 0.05, 0.10, 0.20, 0.50), exhibit improved hydrogen permeability and enhanced stability compared to their parent oxides, achieving a maximum value of 0.20 mL min⁻¹ cm⁻² at x = 0.05. Moreover, the declining hydrogen permeability performance of lanthanum tungstate MPEC membranes during high-temperature operation was systematically analyzed and relative solutions are put forward. The anion-doping and stability-improving strategies might accelerate the development and future practical applications of MPEC membranes.

中文翻译：

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使用阴离子掺杂策略调整氢可渗透膜的分离性能

克服氢渗透性和稳定性之间的困境对于实现混合的质子-电子导电（MPEC）膜的广泛应用至关重要。在本文中，首次报道了氟阴离子掺杂以调节MPEC膜的分离性能。镧钨氟氧化物膜，拉_5.5 w ^ _0.6沫_0.4 ø _{11.25- δ} ˚F _X（X = 0，0.025，0.05，0.10，0.20，0.50），相对于它们的父氧化物表现出改善的透氢性和增强的稳定性，实现了最大值在x时为0.20 mL min ^-1 cm ^-2= 0.05。此外，系统地分析了钨酸镧MPEC膜在高温下的氢渗透性能下降，并提出了相应的解决方案。掺杂阴离子和提高稳定性的策略可能会加快MPEC膜的开发和未来的实际应用。