High-efficiency oxygen evolution catalysts: composite hexagonal structure SrCo1-yNiyO3-δ/Sr9Ni7O21

IF 3.5 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Dalton Transactions Pub Date : 2025-04-21 DOI:10.1039/d5dt00324e

Xiaolong Yang, Hongyuan Song, Ruihang Yao, Haorong Wu, Kun Dong, Liangwei Chen, Bin Liu, Zhenhua Ge, Lan Yu

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引用次数: 0

Abstract

Transition metal perovskite oxides are regarded as ideal catalysts for the oxygen evolution reaction (OER) owing to the high tunability of the B-site active elements. Among them, SrCoO3 has been widely studied due to its high theoretical catalytic performance, but incomplete oxidation of the B-site elements results in poor intrinsic activity. Herein, we prepared a series of SrCo1-xNixO3-δ (x = 0-0.5) catalysts for alkaline OER using a simple sol-gel method and optimized their catalytic performance by modulating the Co/Ni ratio and annealing temperature (950 ℃ and 1050 ℃). Among the series, SrCo0.6Ni0.4O3-δ (annealed at 950 ℃) with a composite hexagonal structure (SrCo1-yNiyO3-δ/Sr9Ni7O21, y = 0.1-0.2) exhibited the best OER activity, achieving an overpotential of 321 mV at 10 mA cm-2 (1 M KOH). The introduction of Ni ions and the presence of Sr₉Ni₇O₂₁ not only enhance the Co4+/Co3+ and Ni3+/Ni2+ ratios, but also promote the generation of more highly oxidative oxygen species (O22-/O-). Additionally, the abundant Ni3+ surface facilitates the formation of highly active NiOOH phase during OER, leading to a further reduction in the overpotential (after 1000 CV cycles, the overpotential on the nickel foam electrode decreased by 45 mV).

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高效析氧催化剂：复合六方结构SrCo1-yNiyO3-δ/Sr9Ni7O21

过渡金属钙钛矿氧化物由于其b位活性元素的高可调性而被认为是析氧反应（OER）的理想催化剂。其中SrCoO3因其较高的理论催化性能而被广泛研究，但b位元素氧化不完全导致其固有活性较差。本文采用简单的溶胶-凝胶法制备了一系列SrCo1-xNixO3-δ (x = 0-0.5)碱性OER催化剂，并通过调节Co/Ni比和退火温度（950℃和1050℃）对其催化性能进行了优化。其中，复合六方结构（SrCo1-yNiyO3-δ/Sr9Ni7O21, y = 0.1 ~ 0.2）的SrCo0.6Ni0.4O3-δ（950℃退火）在10 mA cm-2 （1 M KOH）下的过电位达到321 mV， OER活性最好。Ni离子的引入和Sr₉Ni₇O₂₁的存在不仅提高了Co4+/Co3+和Ni3+/Ni2+的比例，而且还促进了更高氧化性的氧的产生（O22-/O-）。此外，丰富的Ni3+表面有助于在OER过程中形成高活性的NiOOH相，从而进一步降低过电位（经过1000 CV循环后，泡沫镍电极上的过电位降低了45 mV）。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Dalton Transactions 化学-无机化学与核化学

CiteScore

6.60

自引率

7.50%

发文量

1832

审稿时长

1.5 months

期刊介绍： Dalton Transactions is a journal for all areas of inorganic chemistry, which encompasses the organometallic, bioinorganic and materials chemistry of the elements, with applications including synthesis, catalysis, energy conversion/storage, electrical devices and medicine. Dalton Transactions welcomes high-quality, original submissions in all of these areas and more, where the advancement of knowledge in inorganic chemistry is significant.