阴离子交换膜电解水用自支撑电极的本征活性和传质过程双调控

阴离子交换膜水电解（AEMWE）被认为是大规模制氢的一种有前途的方法。然而，AEMWE的性能受限于催化剂的缓慢反应动力学以及气体和电解质在高电流密度下的不良传质。在这里，我们报道了Fe0.2Ni0.8-P0.5S0.5纳米岛阵列作为一种高效的双功能催化剂，具有85 mV（HER）和180 mV（OER）的超低过电势，以实现10 mA cm−2的电流密度。密度泛函理论计算表明，Fe0.2Ni0.8-P0.5S0.5的双金属掺杂有效地提高了本征活性。特别地，Fe0.2Ni0.8-P0.5S0.5电极具有超亲水性和憎气性，这不仅有助于活性位点的暴露，而且在高电流密度下显著增强了气体和电解液的扩散。因此，基于Fe0.2Ni0.8-P0.5S0.5双功能电极的AEMWE在2.0V时提供2.5A cm−2的电流密度。此外，AEMWE保持长期运行，300小时内没有明显的性能下降

Anion exchange membrane water electrolysis (AEMWE) is recognized as a promising strategy for large-scale hydrogen production. However, the performance of AEMWE is restricted by the sluggish reaction kinetics of catalysts and impaired mass transfer of gases and electrolytes under high current densities. Herein, we report Fe₀.₂Ni₀.₈-P₀.₅S₀.₅ nanoisland arrays as an efficient bifunctional catalyst, which exhibits ultra-low overpotentials of 85 mV for hydrogen evolution reaction (HER) and 180 mV for oxygen evolution reaction (OER) at a current density of 10 mA cm⁻². Density functional theory (DFT) calculations reveal that the bimetallic doping of Fe₀.₂Ni₀.₈-P₀.₅S₀.₅ effectively boosts the intrinsic activity. Notably, the Fe₀.₂Ni₀.₈-P₀.₅S₀.₅ electrode possesses superhydrophilicity and aerophobicity, which not only facilitates the exposure of active sites but also dramatically enhances the diffusion of gases and electrolytes at high current densities. As a result, the AEMWE based on the Fe₀.₂Ni₀.₈-P₀.₅S₀.₅ bifunctional electrode delivers a current density of 2.5 A cm⁻² at 2.0 V. Furthermore, the AEMWE maintains stable long-term operation without noticeable performance degradation over 300 consecutive hours.

搜集汇总

背景与挑战

背景概述

该数据集聚焦于阴离子交换膜水电解（AEMWE）技术，研究通过Fe0.2Ni0.8-P0.5S0.5纳米岛阵列作为双功能催化剂，实现了对本征活性和传质过程的双重调控，从而提升电解水性能。数据集包含实验数据、理论计算等内容，旨在支持氢能领域的高效制氢研究，具有明确的工程应用背景和科学价值。