Single-source-precursor synthesis of porous Ni2Si/SiOC composites as oxygen evolution reaction electrocatalyst

IF 3.5 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Dalton Transactions Pub Date : 2025-04-08 DOI:10.1039/d5dt00349k

Yaohao Zhang, Chuanmu Tian, Tianshu Jiang, Wei Li, Marcus Einert, Jan Philipp Hofmann, Leopoldo Molina-Luna, Ralf Riedel, Zhaoju Yu

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Abstract

In this study, a novel carbon-rich Ni2Si/SiOC ceramic composite was successfully synthesized by polymer-derived ceramic approach, which is found to be catalytically active in the field of oxygen evolution reaction (OER). The synthesis involves the reaction of a commercially available carbon-rich polysiloxane precursor SPR-684 and nickel acetylacetonate, forming a Ni-containing single-source-precursor (SSP). Besides, to investigate the influence of porosity on OER performance, polystyrene (PS) was used as a sacrificial template for pore formation. Thermal treatment of the obtained mixture of SSP and PS at 1400 °C leads to the Ni2Si particles being encapsulated by structural ordered carbon, potentially enhancing the electrical conductivity of the composite. And the sample prepared at 1400 °C presented weight fractions of the crystalline phases Ni2Si and SiC in the amounts of 39.6 wt% and 29.3 wt%, respectively. Regarding the OER performance, with the support of increased conductive carbon formation, the sample obtained at 1400 °C demonstrated the best overpotential of 336 mV versus the reversible hydrogen electrode (RHE) at a current density of 10 mA cm⁻² in 1 M KOH, indicating enhanced performance in the oxygen evolution reaction region.

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单源前驱体制备多孔Ni2Si/SiOC复合材料作为析氧反应电催化剂

在本研究中，采用聚合物衍生陶瓷方法成功合成了一种新型富碳Ni2Si/SiOC陶瓷复合材料，该复合材料在析氧反应（OER）领域具有催化活性。该合成涉及到市售的富碳聚硅氧烷前驱体SPR-684和乙酰丙酮镍的反应，形成含镍单源前驱体（SSP）。此外，为了研究孔隙率对OER性能的影响，采用聚苯乙烯（PS）作为孔隙形成的牺牲模板。在1400℃下对SSP和PS的混合物进行热处理，Ni2Si颗粒被结构有序碳包裹，潜在地提高了复合材料的导电性。在1400℃下制备的样品中，Ni2Si和SiC晶相的重量分数分别为39.6 wt%和29.3 wt%。在OER性能方面，在增加导电碳形成的支持下，在1400°C时获得的样品与可逆氢电极（RHE）相比，在1 M KOH中电流密度为10 mA cm⁻²时的最佳过电位为336 mV，表明在析氧反应区性能增强。

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.