New Nanocomposites Derived from Cation-Nonstoichiometric Bax(Co, Fe, Zr, Y)O3−δ as Efficient Electrocatalysts for Water Oxidation in Alkaline Solution

IF 9.6 1区化学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY ACS Materials Letters Pub Date : 2024-06-12 DOI:10.1021/acsmaterialslett.4c00789

Fatma Abdelghafar, Xiaomin Xu*, Daqin Guan, Zezhou Lin, Zhiwei Hu, Meng Ni, Haitao Huang, Tejas Bhatelia, San Ping Jiang and Zongping Shao*,

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Abstract

Perovskite oxides are promising electrocatalysts due to their rich composition, facile synthesis, and favorable stability under oxidizing conditions. Despite extensive research on doping strategies, the impact of cation nonstoichiometry on electrocatalytic performance is less understood. Here, we reveal that A-site cation nonstoichiometry significantly influences the phase evolution of Ba_x(Co, Fe, Zr, Y)O_3−δ, transitioning from a single cubic perovskite (x = 1) to a nanocomposite comprising a major cubic perovskite phase and a minor hexagonal swedenborgite phase (0.80 ≤ x ≤ 0.95). The nanocomposite with a nominal chemical composition of Ba_0.80Co_0.7Fe_0.1Zr_0.1Y_0.1O_3−δ showed markedly enhanced electrocatalytic performance for the oxygen evolution reaction (OER) in alkaline solutions due to the synergistic effect of the two strongly interacting phases, promoting a lattice-oxygen-participating OER pathway. Further optimizing cation nonstoichiometry allowed the design of nanocomposites with controlled phase concentrations. The optimal candidate, with an increased content of the swedenborgite phase, demonstrated further boosted OER performance.

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阳离子-非全度性 Bax(Co,Fe,Zr,Y)O3-δ衍生的新型纳米复合材料是碱性溶液中水氧化的高效电催化剂

透镜氧化物成分丰富、易于合成，而且在氧化条件下具有良好的稳定性，因此是一种前景广阔的电催化剂。尽管对掺杂策略进行了广泛的研究，但人们对阳离子非全度性对电催化性能的影响了解较少。在这里，我们揭示了 A 位阳离子非全度性对 Bax(Co,Fe,Zr,Y)O3-δ的相演化有显著影响，使其从单一立方包晶（x = 1）过渡到由主要立方包晶相和次要六方斜方晶相（0.80 ≤ x ≤ 0.95）组成的纳米复合材料。标称化学成分为 Ba0.80Co0.7Fe0.1Zr0.1Y0.1O3-δ 的纳米复合材料在碱性溶液中的氧进化反应（OER）中表现出明显的电催化性能，这是由于两种强相互作用相的协同效应促进了晶格氧参与的 OER 途径。进一步优化阳离子的非化学计量，可以设计出具有可控相浓度的纳米复合材料。最佳的候选材料增加了钨硼铁矿相的含量，进一步提高了 OER 性能。

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来源期刊

ACS Materials Letters MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

14.60

自引率

3.50%

发文量

261

期刊介绍： ACS Materials Letters is a journal that publishes high-quality and urgent papers at the forefront of fundamental and applied research in the field of materials science. It aims to bridge the gap between materials and other disciplines such as chemistry, engineering, and biology. The journal encourages multidisciplinary and innovative research that addresses global challenges. Papers submitted to ACS Materials Letters should clearly demonstrate the need for rapid disclosure of key results. The journal is interested in various areas including the design, synthesis, characterization, and evaluation of emerging materials, understanding the relationships between structure, property, and performance, as well as developing materials for applications in energy, environment, biomedical, electronics, and catalysis. The journal has a 2-year impact factor of 11.4 and is dedicated to publishing transformative materials research with fast processing times. The editors and staff of ACS Materials Letters actively participate in major scientific conferences and engage closely with readers and authors. The journal also maintains an active presence on social media to provide authors with greater visibility.