Aslam Hossain, Zhengyou Li, Alexander V. Soldatov, A. K. M. Atique Ullah
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引用次数: 0
摘要
本研究探索了一种新的策略，通过氟和过量非晶碳诱导的晶格修饰来提高碳负载岩盐型NiCo2(O，F)3纳米棒的析氢反应（HER）活性。x射线吸收近边结构（XANES）分析证实Co和Ni主要存在于+2氧化态，而扩展x射线吸收精细结构（EXAFS）分析显示Co - o和Co - Co键长度缩短，表明晶格畸变。Rietveld细化和电子显微镜证实形成了均匀的固溶体（NixCo2-x(O，F)3），而不是简单的CoO/NiO复合材料。优化后的材料AH-2表现出最低的过电位（145 mV at 10 mA cm−1）和最小的Tafel斜率（98 mV dec−1），这归功于其平衡的相组成，增强的电子导电性以及碳和氟掺入的协同效应。电化学阻抗谱（EIS）证实了电荷转移效率的提高，与催化活性的增强有关。这些发现为通过控制晶格修饰过渡金属氧化物催化剂的可调性提供了重要的见解，为开发具有成本效益和高效的可持续制氢电催化剂提供了一条有希望的途径。
Exploring Novel Engineering Strategy to Tune Hydrogen Evolution by Lattice Impacted Carbon-Supported Rock Salt-Type NiCo2(O,F)3 Nanorods
This study explores a novel strategy to enhance the hydrogen evolution reaction (HER) activity of carbon-supported rock salt-type NiCo2(O,F)3 nanorods through lattice modifications induced by fluorine and excess amorphous carbon. X-ray absorption near-edge structure (XANES) analysis confirmed that Co and Ni predominantly exist in the +2 oxidation state, whereas extended X-ray absorption fine structure (EXAFS) analysis revealed shortened Co–O and Co–Co bond lengths, indicating lattice distortions. Rietveld refinement and electron microscopy confirmed the formation of a homogeneous solid solution (NixCo2-x(O,F)3) rather than a simple CoO/NiO composite. The optimized material (AH-2) exhibited the lowest overpotential (145 mV at 10 mA cm−1) and the smallest Tafel slope (98 mV dec−1), attributed to its balanced phase composition, enhanced electronic conductivity, and synergistic effects of carbon and fluorine incorporation. Electrochemical impedance spectroscopy (EIS) confirmed improved charge transfer efficiency, correlating with enhanced catalytic activity. These findings provide critical insights into the tunability of transition metal oxide catalysts via controlled lattice modifications, offering a promising avenue for developing cost-effective and efficient electrocatalysts for sustainable hydrogen production.
期刊介绍：
Energy & Environmental Materials (EEM) is an international journal published by Zhengzhou University in collaboration with John Wiley & Sons, Inc. The journal aims to publish high quality research related to materials for energy harvesting, conversion, storage, and transport, as well as for creating a cleaner environment. EEM welcomes research work of significant general interest that has a high impact on society-relevant technological advances. The scope of the journal is intentionally broad, recognizing the complexity of issues and challenges related to energy and environmental materials. Therefore, interdisciplinary work across basic science and engineering disciplines is particularly encouraged. The areas covered by the journal include, but are not limited to, materials and composites for photovoltaics and photoelectrochemistry, bioprocessing, batteries, fuel cells, supercapacitors, clean air, and devices with multifunctionality. The readership of the journal includes chemical, physical, biological, materials, and environmental scientists and engineers from academia, industry, and policy-making.
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