Zahrah Alhalili, Mohammad Shariq, Wafa Al-Gethami, Zarah I. Alzahrani, Fahad Saleh Almubaddel, Noha Al-Qasmi
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引用次数: 0
摘要
析氢反应（HER）对清洁能源生产至关重要；然而，它在水电解过程中经常受到高过电位的影响，大大增加了制氢的成本。为了解决这个问题，通过水热法合成了具有成本效益的fe掺杂CoS纳米颗粒（NPs），从而增强了HER的电催化活性。Fe掺杂通过优化电导率和利用Fe和Co金属离子的协同效应提高了HER性能。综合表征技术证实了在0.5 M H2SO4中催化性能的增强。在所制备的催化剂中，Fe0.3Co0.7S NPs表现出较高的催化性能，过电位较小，为185 mV， Tafel斜率为64 mV/dec。在10 mA/cm2的0.5 M H2SO4中表现出优异的稳定性。Fe0.3Co0.7S纳米粒子的特殊活性可能是由于最佳的Fe掺杂，增强了CoS活性位点，而过量的Fe掺杂通过破坏活性边缘位点而阻碍了HER活性。
Boosting hydrogen evolution efficiency in acidic media with Fe-doped CoS electrocatalysts
Hydrogen evolution reaction (HER) is crucial for clean energy production; however, it often suffers from high overpotentials during water electrolysis, significantly increasing the cost of hydrogen production. To address this, cost-effective Fe-doped CoS nanoparticles (NPs) were synthesized via a hydrothermal method, achieving enhanced electrocatalytic activity for HER. Fe doping improved HER performance by optimizing conductivity and leveraging the synergistic effects of Fe and Co metal ions. Comprehensive characterization techniques confirmed enhanced catalytic properties, which were demonstrated in 0.5 M H2SO4. Among the prepared catalysts, Fe0.3Co0.7S NPs show higher catalytic performance with a smaller overpotential of 185 mV and a Tafel slope of 64 mV/dec. Also, it exhibits excellent stability in 0.5 M H2SO4 at 10 mA/cm2. The exceptional activity of Fe0.3Co0.7S nanoparticles may result from optimal Fe doping, enhancing CoS active sites, while excessive doping hinders HER activity by spoiling active edge sites.
期刊介绍：
The objective of the Journal of Nanoparticle Research is to disseminate knowledge of the physical, chemical and biological phenomena and processes in structures that have at least one lengthscale ranging from molecular to approximately 100 nm (or submicron in some situations), and exhibit improved and novel properties that are a direct result of their small size.
Nanoparticle research is a key component of nanoscience, nanoengineering and nanotechnology.
The focus of the Journal is on the specific concepts, properties, phenomena, and processes related to particles, tubes, layers, macromolecules, clusters and other finite structures of the nanoscale size range. Synthesis, assembly, transport, reactivity, and stability of such structures are considered. Development of in-situ and ex-situ instrumentation for characterization of nanoparticles and their interfaces should be based on new principles for probing properties and phenomena not well understood at the nanometer scale. Modeling and simulation may include atom-based quantum mechanics; molecular dynamics; single-particle, multi-body and continuum based models; fractals; other methods suitable for modeling particle synthesis, assembling and interaction processes. Realization and application of systems, structures and devices with novel functions obtained via precursor nanoparticles is emphasized. Approaches may include gas-, liquid-, solid-, and vacuum-based processes, size reduction, chemical- and bio-self assembly. Contributions include utilization of nanoparticle systems for enhancing a phenomenon or process and particle assembling into hierarchical structures, as well as formulation and the administration of drugs. Synergistic approaches originating from different disciplines and technologies, and interaction between the research providers and users in this field, are encouraged.
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