Bhatti Afia Kanwal, Jabeen Naila, Bashir Amna, Khan Latif U, Bokhari Syeda Wishal, Akhter Zareen
Department of Chemistry, Quaid-i-Azam University Islamabad 45320 Pakistan
Nanoscience's and Technology Division, National Center for Physics, Quaid-i-Azam University Campus Shahdra Valley Road, P.O. Box 2141 Islamabad 44000 Pakistan
RSC Adv. 2023 Oct 3;13(41):28602-28612. doi: 10.1039/d3ra04600a. eCollection 2023 Sep 26.
The intricate problems concerning energy require innovative solutions. Herein, we propose a smart composite nano system that can be used in a sustainable and dichotomous manner to resolve energy crises. The current study describes a new way to synthesize a pure spinel cobalt oxide (CoO) and boron (B), nitrogen (N), and sulfur (S) tri-doped CoO-reduced graphite oxide (rGO) nanocomposite (CBNS). A hydrothermal method has been used for the synthesis of these nanomaterials. The synthesized nanocomposite was characterized by UV-visible spectroscopy, X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), X-ray absorption spectroscopy (XAS), and transmission electron microscopy (TEM). The XRD results showed the formation of CoO and B, N, S doped nanocomposite with high purity and crystallinity. XAS analysis elucidates the formation of spinel CoO with tetrahedral and octahedral arrangement of cobalt ions. The peaks at 2.50 Å and 3.07 Å are due to the Co-Co bonding. The electrocatalytic oxygen reduction (ORR) was successfully implemented using these nanocomposites. The electrochemical study exhibits the better activity of the B, N, and S tri-doped CoO-rGO nanocomposite due to the mutual effect of B, N and S. The synthesized catalyst has maximum current density of 9.97 mA cm with onset potential () of 0.98 V in alkaline medium.
与能源相关的复杂问题需要创新的解决方案。在此，我们提出一种智能复合纳米系统，它可以以可持续和二分的方式用于解决能源危机。当前的研究描述了一种合成纯尖晶石氧化钴（CoO）以及硼（B）、氮（N）和硫（S）三掺杂CoO-还原氧化石墨烯（rGO）纳米复合材料（CBNS）的新方法。已采用水热法来合成这些纳米材料。通过紫外可见光谱、X射线衍射（XRD）、拉曼光谱、扫描电子显微镜（SEM）、X射线吸收光谱（XAS）和透射电子显微镜（TEM）对合成的纳米复合材料进行了表征。XRD结果表明形成了具有高纯度和结晶度的CoO以及B、N、S掺杂的纳米复合材料。XAS分析阐明了具有钴离子四面体和八面体排列的尖晶石CoO的形成。2.50 Å和3.07 Å处的峰归因于Co-Co键。使用这些纳米复合材料成功实现了电催化氧还原（ORR）。电化学研究表明，由于B、N和S的相互作用，B、N和S三掺杂的CoO-rGO纳米复合材料具有更好的活性。合成的催化剂在碱性介质中的最大电流密度为9.97 mA cm，起始电位（）为0.98 V。
