Supplementary information files for "Collaborative reconstruction of FeOOH/FeNiCo-LDH heterogeneous nanosheets for enhancing anion exchange membrane seawater electrolysis"

Supplementary files for article "Transition-metal based layered double hydroxides (TM-LDHs) have attracted widespread attention due to their advantages for the electrocatalytic oxygen evolution reaction (OER). However, their sluggish and unstable reconstruction during the OER has seriously limited their applications in water electrolysis at industrial-level current density. Herein, FeOOH/FeNiCo-LDH heterogeneous nanosheets (2.1 nm in thickness) are uniformly integrated on honeycomb-channel N-doped carbon (FeOOH/FeNiCo-LDH/HCNC) through a self-sacrificing and dual-ion etching strategy. Thermodynamically favoured hydrogen/electron-capturing ability of FeOOH together with kinetically favoured rapid mass/electron transfer efficiency of conductive HCNC collaboratively accelerates the reconstruction of FeNiCo-LDH to generate highly active and stable FeNiCoOOH species, which displays an optimal reaction pathway with reduced energy barrier for the OER. Consequently, FeOOH/FeNiCo-LDH/HCNC exhibits superior OER activity in both alkaline freshwater (η10 = 258 mV with Tafel slope of 32.4 mV dec−1) and alkaline natural seawater (η10 = 296 mV with Tafel slope of 54.7 mV dec−1). When applied in anion exchange membrane electrolyzer as OER electrocatalyst, FeOOH/FeNiCo-LDH/HCNC achieves outstanding stability with low cell-voltage increase rates of 1.7 mV h−1 (freshwater) and 1.5 mV h−1 (seawater) over 120 h at the industrially required current density of 500 mA cm−2. This study proposed an ingenious reconstruction strategy for advanced TM-LDH electrocatalysts toward industrial applications."© The Author(s) CC BY-NC-ND 4.0

论文《过渡金属基层状双氢氧化物（TM-LDHs）因其在电催化析氧反应（OER）中的优势而广受关注。然而，它们在OER过程中缓慢且不稳定的重构严重限制了其在工业级电流密度下电解水的应用。本文中，通过自牺牲双离子刻蚀策略，将FeOOH/FeNiCo-LDH异质纳米片（厚度2.1 nm）均匀集成于蜂窝通道氮掺杂碳（FeOOH/FeNiCo-LDH/HCNC）上。FeOOH热力学上有利的氢/电子捕获能力，与导电HCNC动力学上有利的快速质量/电子传递效率协同作用，加速了FeNiCo-LDH的重构，生成高活性且稳定的FeNiCoOOH物种；该物种为OER提供了能量势垒降低的最优反应路径。因此，FeOOH/FeNiCo-LDH/HCNC在碱性淡水（η10=258 mV，塔菲尔斜率32.4 mV dec⁻¹）和碱性天然海水（η10=296 mV，塔菲尔斜率54.7 mV dec⁻¹）中均表现出优异的OER活性。将其作为OER电催化剂应用于阴离子交换膜电解槽时，在工业要求的500 mA cm⁻²电流密度下运行120小时，FeOOH/FeNiCo-LDH/HCNC展现出卓越的稳定性，电池电压增长率仅为1.7 mV h⁻¹（淡水）和1.5 mV h⁻¹（海水）。本研究为面向工业应用的先进TM-LDH电催化剂提出了一种巧妙的重构策略。》的补充文件。© 作者 CC BY-NC-ND 4.0