Tailoring sulfurization conditions in NiFe-PBA-derived NiSx@FeSx electrocatalysts for enhanced bifunctional water splitting

IF 3.9 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Purusottam Reddy B, Shrouq H. Aleithan, Naveen B, Youngsuk Suh, Si-Hyun Park
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Abstract

Designing efficient, cost-effective electrocatalysts for electrochemical splitting of water is essential towards developing clean hydrogen energy devices. Here, we report a set of NiSx@FeSx nanocomposites from NiFe-based Prussian Blue Analogue (PBA) materials, along with a detailed analysis of how sulfurization temperature in a range of 400–650 °C impacts structure evolution, surface composition, and electrochemical performance. The structure determination of NiSx@FeSx nanocomposites confirmed mixed-metal sulfide phases of NiS2 as well as FeS2, along with heterogeneous interfaces and favorable Ni3⁺ and Fe3⁺ oxidation states, both of which are significant for catalytic activity. Amongst all, NiSx@FeSx nanocomposite sulfurized at 500 °C displayed maximal electrocatalytic performance. Its higher catalytic activity was attributed to a synergistic coupling of heterogeneous, interconnected interfaces along with increased ionic conductivity, allowing for more effective charge transfer as well as enhanced reaction kinetics. The electrochemical data affirmed that NiSx@FeSx-500 needed a low overpotential of 276 mV towards oxygen evolution reaction (OER) at 50 mA cm⁻2, coupled with a resultant Tafel slope of 91 mV dec⁻1. Towards hydrogen evolution reaction (HER), it demonstrated a low overpotential of 179 mV at 10 mA cm⁻2 as well as a Tafel slope of 81 mV dec⁻1, reflecting effective reaction kinetics. Additionally, the two-electrode electrolyzer constructed using this material both as anode and cathode needed merely 1.706 V to reach 10 mA cm⁻2, while operating stably over a period of 10 h. These observations point towards potential applications of NiFe-PBA-derived NiSx@FeSx-500 nano composite as a stable, cost-effective bifunctional electrocatalyst towards overall water splitting technologies.

Graphical abstract

定制硫化条件的nife - pba衍生NiSx@FeSx电催化剂增强双功能水分解
设计高效、经济的电催化剂用于水的电化学分解是开发清洁氢能源装置的关键。在这里,我们报告了一组由nife基普鲁士蓝类似物(PBA)材料制成的NiSx@FeSx纳米复合材料,并详细分析了400-650°C范围内硫化温度如何影响结构演变,表面组成和电化学性能。NiSx@FeSx纳米复合材料的结构测定证实了NiS2和FeS2的混合金属硫化物相,以及非均相界面和有利的Ni3 +和Fe3 +氧化态,这两种氧化态对催化活性都有重要意义。其中,NiSx@FeSx纳米复合材料在500℃下硫化表现出最大的电催化性能。其较高的催化活性归因于异质、互联界面的协同耦合以及离子电导率的增加,从而允许更有效的电荷转移以及增强的反应动力学。电化学数据证实NiSx@FeSx-500需要276 mV的低过电位才能在50 mA cm - 2下进行析氧反应(OER),同时产生91 mV dec - 1的塔菲斜率。对于析氢反应(HER),它显示出在10 mA cm - 2时的低过电位179 mV和81 mV dec - 1的塔菲尔斜率,反映了有效的反应动力学。此外,使用这种材料作为阳极和阴极的双电极电解槽只需要1.706 V就能达到10 mA cm⁻2,同时在10小时内稳定运行。这些观察结果表明,nfe - pba衍生的NiSx@FeSx-500纳米复合材料作为一种稳定、经济高效的双功能电催化剂,有望应用于整体水分解技术。图形抽象
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来源期刊
Journal of Materials Science
Journal of Materials Science 工程技术-材料科学:综合
CiteScore
7.90
自引率
4.40%
发文量
1297
审稿时长
2.4 months
期刊介绍: The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.
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