Muhammad Ali Ehsan*, Abuzar Khan*, Muhammad Ali, Mohammed Ashraf Gondal and Abbas Saeed Hakeem,
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引用次数: 0
摘要
碱性水电解有可能成为生产绿色氢气和实现碳净零排放的重要方法。因此,开发氢进化反应(HER)催化值更高的催化剂对于推动水分离技术的发展至关重要。本研究介绍了一种采用气溶胶辅助化学气相沉积法在泡沫镍(NF)上制备双金属 RuCo 合金的简便沉积策略,该合金可在碱性条件下用作不含铂的高性能 HER 催化剂。Co 和 Ru 的协同作用以及 RuCo@NF 的结构优势显著提高了电催化性能。优化后的 RuCo@NF 催化剂具有 HER 活性,在 17 mV 和 100 mV 的低过电位下,电流密度分别达到 10 mA 和 100 mA cm-2。此外,该催化剂的最小塔菲尔斜率为 42 mV dec-1,并且在 1.0 M KOH 中的稳定性超过了基准 Pt/C 催化剂,超过了 24 小时。此外,密度泛函理论分析验证了实验结果,显示在 HER 过程中,RuCo 合金的吉布斯自由能值(-0.35 eV)低于金属 Ru(-0.50 eV)和 Co(-0.57 eV)。这项研究为开发高活性、坚固耐用的双金属薄膜电催化剂提供了一条便捷的途径,证明了它在燃料电池制氢方面的潜力。
Facile Deposition of a Spherical Ruthenium–Cobalt Alloy on Nickel Foam as a High-Performance Electrocatalyst for Alkaline Hydrogen Production
Alkaline water electrolysis has the potential to become an important method for producing green hydrogen and achieving net-zero carbon emissions. Consequently, the development of catalysts with higher catalytic values for the hydrogen evolution reaction (HER) is essential for advancing the water-splitting technology. This study introduces a facile deposition strategy using aerosol-assisted chemical vapor deposition to fabricate a bimetallic RuCo alloy on nickel foam (NF), which serves as a Pt-free, high-performance HER catalyst under alkaline conditions. The synergy between Co and Ru, along with the structural advantages of RuCo@NF, significantly enhances the electrocatalytic performance. The optimized RuCo@NF catalyst exhibited HER activity, achieving current densities of 10 and 100 mA cm–2 at low overpotentials of 17 and 100 mV, respectively. Moreover, it had a minimal Tafel slope of 42 mV dec–1 and demonstrated stability over 24 h, surpassing that of the benchmark Pt/C catalyst when measured in 1.0 M KOH. Furthermore, density functional theory analysis validated the experimental results, revealing a lower Gibbs free energy value for the RuCo alloy (−0.35 eV) compared to that of metallic Ru (−0.50 eV) and Co (−0.57 eV) in the HER process. This study presents a convenient pathway for the development of a highly active and robust bimetallic thin-film electrocatalyst, demonstrating its potential for hydrogen production in fuel cells.
期刊介绍:
ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.