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氧化钯@硒化钴复合材料:碱性介质中高效的析氧电催化剂。

PdO@CoSe composites: efficient electrocatalysts for water oxidation in alkaline media.

作者信息

Hanan Abdul, Solangi Muhammad Yameen, Jaleel Laghari Abdul, Shah Aqeel Ahmed, Aftab Umair, Ibupoto Zahoor Ahmed, Abro Muhammad Ishaque, Lakhan Muhammad Nazim, Soomro Irfan Ali, Dawi Elmuez A, Al Karim Haj Ismail Abd, Mustafa Elfatih, Vigolo Brigitte, Tahira Aneela, Ibupoto Zafar Hussain

机构信息

Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University 150001 Harbin PR China.

Department of Metallurgy and Materials Engineering, Mehran University of Engineering and Technology 76080 Jamshoro Pakistan

出版信息

RSC Adv. 2023 Jan 3;13(1):743-755. doi: 10.1039/d2ra07340d. eCollection 2022 Dec 19.

Abstract

In this study, we have prepared cobalt selenide (CoSe) due to its useful aspects from a catalysis point of view such as abundant active sites from Se edges, and significant stability in alkaline conditions. CoSe, however, has yet to prove its functionality, so we doped palladium oxide (PdO) onto CoSe nanostructures using ultraviolet (UV) light, resulting in an efficient and stable water oxidation composite. The crystal arrays, morphology, and chemical composition of the surface were studied using a variety of characterization techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR) spectroscopy. It was also demonstrated that the composite systems were heterogeneous in their morphology, undergoing a shift in their diffraction patterns, suffering from a variety of metal oxidation states and surface defects. The water oxidation was verified by a low overpotential of 260 mV at a current density of 20 mA cm with a Tafel Slope value of 57 mV dec. The presence of multi metal oxidation states, rich surface edges of Se and favorable charge transport played a leading role towards water oxidation with a low energy demand. Furthermore, 48 h of durability is associated with the composite system. With the use of PdO and CoSe, new, low efficiency, simple electrocatalysts for water catalysis have been developed, enabling the development of practical energy conversion and storage systems. This is an excellent alternative approach for fostering growth in the field.

摘要

在本研究中,我们制备了硒化钴(CoSe),从催化角度来看,它具有诸多有用的特性,比如来自硒边缘的丰富活性位点以及在碱性条件下具有显著的稳定性。然而,CoSe尚未证明其功能,因此我们利用紫外线(UV)将氧化钯(PdO)掺杂到CoSe纳米结构上,从而得到一种高效且稳定的水氧化复合材料。我们使用了多种表征技术研究了表面的晶体阵列、形态和化学成分,包括X射线衍射(XRD)、扫描电子显微镜(SEM)、高分辨率透射电子显微镜(HRTEM)、X射线光电子能谱(XPS)和傅里叶变换红外(FTIR)光谱。研究还表明,复合体系在形态上是不均匀的,其衍射图谱发生了偏移,存在多种金属氧化态和表面缺陷。在电流密度为20 mA cm时,水氧化的过电位低至260 mV,塔菲尔斜率值为57 mV dec,从而验证了水氧化反应。多种金属氧化态的存在、丰富的硒表面边缘以及良好的电荷传输对低能量需求的水氧化起到了主导作用。此外,复合体系具有48小时的耐久性。通过使用PdO和CoSe,开发出了新型、低效率、简单的水催化电催化剂,推动了实用能量转换和存储系统的发展。这是促进该领域发展的一种绝佳替代方法。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9912/9809149/a5bfbc9fcb0d/d2ra07340d-s1.jpg

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