Tabassum Anila, Ata Sadia, Alwadai Norah, Mnif Wissem, Ali Abid, Ali Abid, Nazir Arif, Iqbal Munawar
School of Chemistry, University of the Punjab, Lahore 54590, Pakistan.
Department of Physics, College of Sciences, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia.
iScience. 2024 Aug 31;27(12):110823. doi: 10.1016/j.isci.2024.110823. eCollection 2024 Dec 20.
In the present study, bimetallic oxides comprising nickel (Ni) and cobalt (Co) were synthesized using a facile hydrothermal method in the presence of CTAB and L-lysine. Their efficacy in catalyzing hydrogen production under alkaline conditions was assessed. Structural, vibrational, and morphological characteristics were analyzed utilizing X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM) techniques. The SEM images revealed a needle-like shape which is due to the surfactant addition. The NiCo oxides exhibited the lowest onset potential of 83 mV for HER and 130 mV for OER under standard conditions. The catalysts needed a potential of 286 and 450 mV to attain a current density of 50 mA/cm along with Tafel slope values of 119 and 332 mV/dec for HER and OER, respectively. These results suggested that L-lysine as a surfactant is highly effective in the fabrication of NiCo bimetal oxides for electrolytic water splitting applications.
在本研究中，在十六烷基三甲基溴化铵（CTAB）和L-赖氨酸存在的情况下，采用简便的水热法合成了包含镍（Ni）和钴（Co）的双金属氧化物。评估了它们在碱性条件下催化产氢的效率。利用X射线衍射（XRD）、傅里叶变换红外（FTIR）光谱和扫描电子显微镜（SEM）技术分析了其结构、振动和形态特征。SEM图像显示出针状形状，这是由于添加了表面活性剂。在标准条件下，NiCo氧化物对析氢反应（HER）的最低起始电位为83 mV，对析氧反应（OER）的最低起始电位为130 mV。催化剂需要286和450 mV的电位才能达到50 mA/cm²的电流密度，HER和OER的塔菲尔斜率值分别为119和332 mV/dec。这些结果表明，L-赖氨酸作为表面活性剂在制备用于电解水分解应用的NiCo双金属氧化物方面非常有效。
