双电极上乙烯电催化制乙二醇的研究

IF 18.2 1区 材料科学 Q1 CHEMISTRY, PHYSICAL
Linsen Huang, Deyu Bao, Yao Zheng* and Shi-Zhang Qiao*, 
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引用次数: 0

摘要

电化学氧化乙烯到乙二醇提供了一个可持续的替代能源密集型热过程。然而,目前使用氯化物介导的乙烯电氧化策略存在选择性低和效率低的问题。在这里,我们报道了一种CrOx-IrO2催化剂,其法拉第效率(FE)达到98.5%,对阳极上的乙二醇具有前所未有的~ 100%的选择性。该催化剂优先促进*Cl在Ir位点上的直接吸附,并在2-氯乙醇(乙二醇的关键前体)形成过程中提高*ClO中间体的覆盖率,同时抑制竞争的*OOH途径。在电解槽中通过阴极h2o2介导的乙烯氧化,该体系在阳极和阴极上的产物选择性都达到了~ 100%,总产率为2.69 mmol cm-2 h-1。与使用氯化物或H2O2作为单独介质的传统系统相比,这种双介质策略分别节省了约52%和76%的能源,为乙烯生产乙二醇提供了一个可扩展的高效平台。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Electrocatalytic Production of Ethylene Glycol from Ethylene on Both Electrodes

Electrocatalytic Production of Ethylene Glycol from Ethylene on Both Electrodes

Electrochemical oxidation of ethylene-to-ethylene glycol offers a sustainable alternative to energy-intensive thermal processes. However, current strategies using chloride-mediated electrooxidation of ethylene suffer from low selectivity and efficiency. Here, we report a CrOx–IrO2 catalyst that achieves a faradaic efficiency (FE) of 98.5% with an unprecedent ∼100% selectivity for ethylene glycol on the anode. This catalyst preferentially promotes direct *Cl adsorption on Ir sites and enhances *ClO intermediate coverage during 2-chloroethanol formation, the key precursor to ethylene glycol, while suppressing the competing *OOH pathway. Coupled with cathodic H2O2-mediated ethylene oxidation in an electrolyzer, this system reaches ∼100% product selectivity at both the anode and cathode, with a total production rate of 2.69 mmol cm–2 h–1. Compared to conventional systems that utilize either chloride or H2O2 as individual mediators, this dual-mediator strategy achieves energy savings of approximately 52 and 76%, respectively, enabling a scalable and efficient platform for ethylene glycol production from ethylene.

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来源期刊
ACS Energy Letters
ACS Energy Letters Energy-Renewable Energy, Sustainability and the Environment
CiteScore
31.20
自引率
5.00%
发文量
469
审稿时长
1 months
期刊介绍: ACS Energy Letters is a monthly journal that publishes papers reporting new scientific advances in energy research. The journal focuses on topics that are of interest to scientists working in the fundamental and applied sciences. Rapid publication is a central criterion for acceptance, and the journal is known for its quick publication times, with an average of 4-6 weeks from submission to web publication in As Soon As Publishable format. ACS Energy Letters is ranked as the number one journal in the Web of Science Electrochemistry category. It also ranks within the top 10 journals for Physical Chemistry, Energy & Fuels, and Nanoscience & Nanotechnology. The journal offers several types of articles, including Letters, Energy Express, Perspectives, Reviews, Editorials, Viewpoints and Energy Focus. Additionally, authors have the option to submit videos that summarize or support the information presented in a Perspective or Review article, which can be highlighted on the journal's website. ACS Energy Letters is abstracted and indexed in Chemical Abstracts Service/SciFinder, EBSCO-summon, PubMed, Web of Science, Scopus and Portico.
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