相关实验视频
Updated: Jun 12, 2025

09:50
Electrochemically and Bioelectrochemically Induced Ammonium Recovery
Published on: January 22, 2015
12.7K
电子海绵效应由动态调节的电子自流向合的电化学氨基合成
Jian-Jia Mu1, Xuan-Wen Gao1,2, Zhiwei Zhao3
1Institute for Energy Electrochemistry and Urban Mines Metallurgy, School of Metallurgy, Northeastern University, Shenyang, Liaoning 110819, China.
ACS nano
|September 18, 2024
概括
一种新的-铁-电催化剂增强了减和氧演化反应. 这种催化剂利用电子海绵效应来有效地固定和合成氨.
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:
- 电催化对于可持续的化学合成和能源转化至关重要.
- 开发高效的电催化剂用于降解反应 (NRR) 和氧演化反应 (OER) 仍然是一个重大挑战.
研究的目的:
- 构建一个动态调节的铁 (Pd-Fe-N) 电催化剂.
- 通过电子捐赠和反捐赠效应优化电催化活动.
- 为了阐明间歇性N-dopant诱导的电子海绵效应的机制.
主要方法:
- 合成PdFe3/FeN电催化剂的方法.
- 对NRR和OER进行电化学测量.
- 在现场减弱的总反射 - 里埃变换红外光谱学 (ATR-FTIR).
- 在X射线吸收光谱学 (XAS).
- 密度函数理论 (DFT) 的计算.
主要成果:
- PdFe3/FeN催化剂在NRR (产率为29.94μg h-1 mgcat-1,FE在-0.2V与RHE时为38.43%) 和OER (308mV在100mA cm-2时) 中表现出很高的性能.
- 间歇性N补充剂诱导了电子海绵效应,在NRR过程中增强了N2捕获和NH3脱吸.
- 缺电子的Fe站点促进了FeOOH重建,加速了OER动力学.
结论:
- 动态调节的Pd-Fe-N电催化剂证明了优化电催化性能的一个有希望的策略.
- 电子海绵效应在增强NRR过程中起着至关重要的作用.
- 这项工作提供了对高效合成和能源储存的先进电催化剂设计的见解.
相关概念视频
Electrolysis
26.2K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
26.2K
Electrogravimetric Analysis: Overview
209
Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.
To test the completeness of the...
To test the completeness of the...
209
Controlled-Current Coulometry: Overview
172
Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
172
Electromotive Force
26.0K
Electricity is generated by either electrons or ions flowing through a solution or a conducting medium. This flow of electrons or specifically electrical charge is defined as an electric current. When electrons move through a wire, they generate an electric current. It can be recalled that in a redox reaction, electrons are lost and gained. In the spontaneous redox reaction of zinc with copper, when zinc is immersed in a copper ion solution, a transfer of electrons from one...
26.0K
Amperometry: Overview
473
Amperometry is a technique commonly used to measure the concentration of specific analytes in a solution by monitoring the electric current generated during an electrochemical reaction. It involves applying a constant potential between a working electrode and a reference electrode to measure the resulting current, which is proportional to the concentration of the analyte. The Clark oxygen electrode operates based on this principle of amperometry. It consists of a cathode and an anode enclosed...
473
Electrodeposition
611
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
611

