期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 645, 期 -, 页码 724-734出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2023.04.172
关键词
Seawater electrolysis; High-entropy metal sulfides; Electrocatalysts; Overall water splitting electrolyzer; Selectivity
High-entropy (NiFeCoV)S2 porous nanosheets were fabricated on Ni foam through a hydrothermal reaction process for alkaline water/seawater electrolysis. The rough and porous nanosheets provided large active surface area and exposed more active sites, facilitating mass transfer and improving catalytic performance. The as-fabricated catalyst exhibited low overpotentials and excellent corrosion resistance, showing promise for efficient water/seawater electrolysis.
Creating electrocatalysts with high activity and stability to meet the needs of highly effective seawater splitting is of great importance to achieve the goal of hydrogen production from abundant seawater source, which however is still challenging owing to sluggish oxygen evolution reaction (OER) dynamics and the existed competitive chloride evolution reaction. Herein, high-entropy (NiFeCoV)S2 porous nanosheets are uniformly fabricated on Ni foam via a hydrothermal reaction process with a sequential sulfurization step for alkaline water/seawater electrolysis. The obtained rough and porous nanosheets provide large active surface area and exposed more active sites, which can facilitate mass transfer and are conducive to the improvement of the catalytic perfor-mance. Combined with the strong synergistic electron modulation effect of multi elements in (NiFeCoV)S2, the as-fabricated catalyst exhibits low OER overpotentials of 220 and 299 mV at 100 mA cm-2 in alkaline water and natural seawater, respectively. Besides, the catalyst can withstand a long-term durability test for more than 50 h without hypochlorite evolution, showing excellent corrosion resistance and OER selectivity. By employing the (NiFeCoV)S2 as the electrocatalyst for both anode and cathode to construct an overall water/seawater splitting electrolyzer, the required cell voltages are only 1.69 and 1.77 V to reach 100 mA cm-2 in alkaline water and natural seawater, respectively, showing a promising prospect towards the practical application for efficient water/seawater electrolysis.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据