Facile cubic Nd doped MnO nanostructure synthesis as effective electrocatalyst for oxygen evolution reaction

IF 4.5 3区化学 Q1 Chemical Engineering

Journal of Electroanalytical Chemistry Pub Date : 2023-08-06 DOI:10.1016/j.jelechem.2023.117705

Mehar Un Nisa , Karam Jabbour , Sumaira Manzoor , Khaled Fahmi Fawy , Abdul Ghafoor Abid , Fayyaz Hussain , Shaimaa A.M. Abdelmohsen , Meznah M. Alanazi , Muhammad Naeem Ashiq

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Abstract

Development of an effective electrocatalyst for the electrochemical water splitting to store electrical energy as H₂ fuel and improve sluggish oxygen evolution reaction (OER) is the need of the time. For H₂ production and making it more accessible, developing a low-cost fabrication method for an efficient OER catalyst with characteristics including a large surface area, an abundance of active sites, and exceptional stability is necessary. In this study, neodymium-doped manganese oxide (Nd-MnO) with a larger specific surface area (32.6 m²/g), small size particles (84 nm), and most crucially high concentration of oxygen vacancies fabricated via a simple solution reduction method using NaBH₄ as a reductant. Nd-MnO has an overpotential of 394 mV and a Tafel slope value of 84 mV/dec reaching 10 mA/cm², superior to RuO₂ and MnO. The potential results of the Nd-MnO are due to a unique structure consisting of nanocubes that may enhance OH ion mass diffusion/transport and offer a large number of active sites for catalysis of OER, as well as oxygen vacancies which are also validated by DFT that may enhance the electronic conductivity and provide H₂O adsorption on the surface of neighboring Mn³⁺ sites.

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易立方Nd掺杂MnO纳米结构作为析氧反应的有效电催化剂的合成

开发一种有效的电催化剂用于电化学水分解，以储存电能作为H2燃料，改善缓慢的析氧反应(OER)是时代的需要。为了生产氢气并使其更容易获得，开发一种低成本的制造方法来制造高效的OER催化剂是必要的，这种催化剂的特点包括大表面积、丰富的活性位点和出色的稳定性。在本研究中，采用NaBH4作为还原剂，通过简单的溶液还原法制备了具有较大比表面积(32.6 m2/g)、小尺寸颗粒(84 nm)和高浓度氧空位的掺钕氧化锰(Nd-MnO)。Nd-MnO的过电位为394 mV, Tafel斜率为84 mV/dec，达到10 mA/cm2，优于RuO2和MnO。Nd-MnO的潜在结果是由于由纳米立方体组成的独特结构，可以增强OH离子的质量扩散/传输，并为OER的催化提供大量的活性位点，以及氧空位，这也被DFT证实，可以增强电子导电性，并在邻近的Mn3+位点表面提供H2O吸附。

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来源期刊

Journal of Electroanalytical Chemistry Chemical Engineering-General Chemical Engineering

CiteScore

7.50

自引率

6.70%

发文量

912

审稿时长

>12 weeks

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.