Self-supporting NiFe LDH-MoS integrated electrode for highly efficient water splitting at the industrial electrolysis conditions

过电位 电解 阳极 分解水 材料科学 电解水 电催化剂 析氧 阴极 碱性水电解 化学工程 法拉第效率 电流密度 催化作用 电化学 电极 电解质 聚合物电解质膜电解 无机化学 化学 物理 工程类 光催化 物理化学 量子力学 生物化学
作者
Han Zhang,Guoqiang Shen,Xinying Liu,Bo Ning,Chengxiang Shi,Lun Pan,Xiangwen Zhang,Zhen‐Feng Huang,Ji‐Jun Zou
出处
期刊:Chinese Journal of Catalysis [Elsevier BV]
卷期号:42 (10): 1732-1741 被引量:69
标识
DOI:10.1016/s1872-2067(21)63796-8
摘要

Developing effective and practical electrocatalyst under industrial electrolysis conditions is critical for renewable hydrogen production. Herein, we report the self-supporting NiFe LDH-MoSx integrated electrode for water oxidation under normal alkaline test condition (1 M KOH at 25 °C) and simulated industrial electrolysis conditions (5 M KOH at 65 °C). Such optimized electrode exhibits excellent oxygen evolution reaction (OER) performance with overpotential of 195 and 290 mV at current density of 100 and 400 mA·cm−2 under normal alkaline test condition. Notably, only overpotential of 156 and 201 mV were required to achieve the current density of 100 and 400 mA·cm−2 under simulated industrial electrolysis conditions. No significant degradations were observed after long-term durability tests for both conditions. When using in two-electrode system, the operational voltages of 1.44 and 1.72 V were required to achieve a current density of 10 and 100 mA·cm−2 for the overall water splitting test (NiFe LDH-MoSx/INF || 20% Pt/C). Additionally, the operational voltage of employing NiFe LDH-MoSx/INF as both cathode and anode merely require 1.52 V at 50 mA·cm−2 at simulated industrial electrolysis conditions. Notably, a membrane electrode assembly (MEA) for anion exchange membrane water electrolysis (AEMWEs) using NiFe LDH-MoSx/INF as an anode catalyst exhibited an energy conversion efficiency of 71.8% at current density of 400 mA·cm−2 in 1 M KOH at 60 °C. Further experimental results reveal that sulfurized substrate not only improved the conductivity of NiFe LDH, but also regulated its electronic configurations and atomic composition, leading to the excellent activity. The easy-obtained and cost-effective integrated electrodes are expected to meet the large-scale application of industrial water electrolysis.
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