Free-Standing Ni nanoparticles wrapped in electrochemically reduced graphene Oxide: A highly efficient electrocatalyst for hydrogen evolution in acidic conditions

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL Separation and Purification Technology Pub Date : 2025-01-27 DOI:10.1016/j.seppur.2025.131834

Bingül Kurt Urhan , Saadet Dinç , Ümit Demir

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Abstract

This study presents an eco-friendly, one-pot electrochemical method for fabricating flexible, free-standing electrodes composed of nickel nanoparticles (NiNPs) wrapped in electrochemically reduced graphene oxide (ERGO). The process involves simultaneous reduction of GO and Ni²⁺ ions on indium-doped tin oxide (ITO) substrates, followed by detachment using H₂ bubbling delamination. Characterization revealed uniform distribution of NiNPs within ERGO layers, providing abundant active sites. After electrochemical activation, the NiNPs/ERGO electrodes demonstrated exceptional hydrogen evolution reaction (HER) performance in 0.5 M H₂SO₄, with a low overpotential of 73 mV at 10 mA cm⁻², a Tafel slope of 31 mV dec⁻¹, and outstanding durability. This innovative approach offers potential for developing high-performance electrocatalysts for water splitting and other applications.

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独立的Ni纳米颗粒包裹在电化学还原的氧化石墨烯中：一种在酸性条件下高效的析氢电催化剂

本研究提出了一种环保的一锅电化学方法，用于制造由电化学还原氧化石墨烯（ERGO）包裹的镍纳米颗粒（NiNPs）组成的柔性独立电极。该工艺包括在铟掺杂氧化锡（ITO）衬底上同时还原GO和Ni2+离子，然后使用H2鼓泡分层分离。表征显示NiNPs在ERGO层内分布均匀，提供丰富的活性位点。电化学活化后，NiNPs/ERGO电极在0.5 M H2SO4中表现出优异的析氢反应（HER）性能，在10 mA cm−2时过电位低至73 mV， Tafel斜率为31 mV dec−1，并且具有优异的耐久性。这种创新的方法为开发用于水分解和其他应用的高性能电催化剂提供了潜力。

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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.