Poly(ethylenimine)-assisted synthesis of hollow carbon spheres comprising multi-sized Ni species for CO2 electroreduction

IF 15.7 1区 化学 Q1 CHEMISTRY, APPLIED
Kaining Li , Yasutaka Kuwahara , Hiromi Yamashita
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Abstract

Electrochemical CO2 reduction to produce value-added chemicals and fuels is one of the research hotspots in the field of energy conversion. The development of efficient catalysts with high conductivity and readily accessible active sites for CO2 electroreduction remains challenging yet indispensable. In this work, a reliable poly(ethyleneimine) (PEI)-assisted strategy is developed to prepare a hollow carbon nanocomposite comprising a single-site Ni-modified carbon shell and confined Ni nanoparticles (NPs) (denoted as Ni@NHCS), where PEI not only functions as a mediator to induce the highly dispersed growth of Ni NPs within hollow carbon spheres, but also as a nitrogen precursor to construct highly active atomically-dispersed Ni-Nx sites. Benefiting from the unique structural properties of Ni@NHCS, the aggregation and exposure of Ni NPs can be effectively prevented, while the accessibility of abundant catalytically active Ni-Nx sites can be ensured. As a result, Ni@NHCS exhibits a high CO partial current density of 26.9 mA cm–2 and a Faradaic efficiency of 93.0% at −1.0 V vs. RHE, outperforming those of its PEI-free analog. Apart from the excellent activity and selectivity, the shell confinement effect of the hollow carbon sphere endows this catalyst with long-term stability. The findings here are anticipated to help understand the structure-activity relationship in Ni-based carbon catalyst systems for electrocatalytic CO2 reduction. Furthermore, the PEI-assisted synthetic concept is potentially applicable to the preparation of high-performance metal-based nanoconfined materials tailored for diverse energy conversion applications and beyond.

聚(乙烯亚胺)辅助合成包含多尺寸镍物种的空心碳球,用于二氧化碳电还原
电化学还原二氧化碳以生产增值化学品和燃料是能源转换领域的研究热点之一。为二氧化碳电还原开发具有高电导率和易获取活性位点的高效催化剂仍然是一项挑战,但也是不可或缺的。在这项工作中,开发了一种可靠的聚乙烯亚胺(PEI)辅助策略,用于制备由单位点镍改性碳壳和致密镍纳米颗粒(NPs)组成的中空碳纳米复合材料(称为 Ni@NHCS),其中 PEI 不仅是诱导镍 NPs 在中空碳球内高度分散生长的介质,还是构建高活性原子分散 Ni-Nx 位点的氮前驱体。得益于 Ni@NHCS 的独特结构特性,可以有效防止 Ni NPs 的聚集和暴露,同时确保获得丰富的催化活性 Ni-Nx 位点。因此,Ni@NHCS 的一氧化碳部分电流密度高达 26.9 mA cm-2,在-1.0 V 对 RHE 时的法拉第效率为 93.0%,优于其不含 PEI 的类似物。除了出色的活性和选择性之外,空心碳球的壳封闭效应还赋予了这种催化剂长期的稳定性。本文的研究结果有望帮助人们理解用于电催化二氧化碳还原的镍基碳催化剂体系的结构-活性关系。此外,PEI 辅助合成概念还可用于制备高性能的金属基纳米封闭材料,以满足各种能源转换应用及其他应用的需要。
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
Chinese Journal of Catalysis
Chinese Journal of Catalysis 工程技术-工程:化工
CiteScore
25.80
自引率
10.30%
发文量
235
审稿时长
1.2 months
期刊介绍: The journal covers a broad scope, encompassing new trends in catalysis for applications in energy production, environmental protection, and the preparation of materials, petroleum chemicals, and fine chemicals. It explores the scientific foundation for preparing and activating catalysts of commercial interest, emphasizing representative models.The focus includes spectroscopic methods for structural characterization, especially in situ techniques, as well as new theoretical methods with practical impact in catalysis and catalytic reactions.The journal delves into the relationship between homogeneous and heterogeneous catalysis and includes theoretical studies on the structure and reactivity of catalysts.Additionally, contributions on photocatalysis, biocatalysis, surface science, and catalysis-related chemical kinetics are welcomed.
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