在空心层氧化物阵列中使用高积工程,通过抑制氧气演变来促进5-氧甲基酸电氧化
Yu Xin1, Hongchuan Fu1, Liyu Chen1
1Guangdong Provincial Key Lab of Green Chemical Product Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
ACS central science
|October 28, 2024
概括
我们开发了空洞高层氧化物阵列 (HE-LHAs),以高效地将5-基甲基 (HMF) 转化为2,5-基酸 (FDCA). 这种新型的电催化剂抑制了竞争的氧演化反应 (OER),增强了FDCA的产生.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 电催化氧化5-甲 (HMF) 到2,5-甲酸 (FDCA) 是生产有价值化学品的一个有前途的途径.
- 氧化演化反应 (OER) 通常与HMF氧化相竞争,降低产量和法拉第效率 (FE).
研究的目的:
- 设计和合成新型电催化剂,以实现高效的HMF氧化.
- 在HMF电氧化过程中抑制竞争的氧演化反应 (OER).
- 在HMF氧化中研究高层氧化阵列 (HE-LHAs) 的结构-活性关系.
主要方法:
- 空洞高层氧化阵列 (HE-LHA) 电催化剂的MOF模板合成.
- 电化学表征包括循环电压测量和时电压测量.
- 有限元模拟和电化学阻抗光谱 (EIS) 在现场.
- 密度函数理论 (DFT) 的计算.
主要成果:
- 一系列由Co,Ni,Mn,Cu,Zn,Cd和Mg组成的五度,七度和七度HE-LHA在碳布上成功合成.
- 七度HE-LHA (CC@CoNiMnCuZnCdMg-LHA) 在HMF氧化方面表现出卓越的性能,在1.42V的低电位下达到100mA cm-2的效果.
- 该HE-LHA结构有效地抑制了OER,OER需要1.68VRHE的潜力才能达到相同的电流密度.
- 有限元模拟显示,空心阵列形态诱导强大的局部电场,增强催化.
- *在现场*的EIS和DFT计算表明,高组成优化HMF*和OH*吸附,有利于HMF氧化和抑制OER.
结论:
- MOF模板合成为构建空心HE-LHA用于电催化提供了通用策略.
- 开发的HE-LHA是HMF氧化到FDCA的高效电催化剂,具有出色的选择性和效率.
- 高纳米架构的理性设计为推进电催化应用提供了一个有希望的途径.
相关概念视频
Hydroboration-Oxidation of Alkenes
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
Microbial Fuel Cells
Microbial fuel cells (MFCs) are bioelectrochemical devices that generate electricity by exploiting the metabolic processes of electrogenic bacteria. These systems provide a renewable energy source and serve as an innovative method for treating organic waste, such as wastewater.A typical MFC consists of two chambers: an anoxic (oxygen-free) compartment that houses the bacteria and an oxic (oxygen-rich) compartment that contains oxygen as the terminal electron acceptor. Many MFCs use proton...


