高效率的光辅助大电流密度水分离与莫特-肖特基异质连接
Minming Jiang1, Jiang Xu1, Yujie Chen2
1College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China.
Angewandte Chemie (International ed. in English)
|October 7, 2024
概括
开发了一种新的MnWO4/FeCoNi Mott-Schottky异质连接电极,用于双功能光生成载体辅助电催化 (PCA-EC). 这种电极能够在较大的电流密度下实现稳定,高性能的水分离.
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
- 可再生能源可再生能源是可再生能源.
背景情况:
- 在高电流密度下开发用于光生成载体辅助电催化剂 (PCA-EC) 的稳定双功能电催化剂具有挑战性.
- 高效分离和利用光生成载体对于增强催化活性至关重要.
- 莫特-肖特基异质连接为改善电荷分离和接口特性提供了潜力.
研究的目的:
- 为PCA-EC应用合成和表征一种新的MnWO4/FeCoNi Mott-Schottky异质连接.
- 在照明下研究增强进化反应 (HER) 和氧进化反应 (OER) 的机制.
- 为了评估电极在高电流密度下对光辅助水分的稳定性和性能.
主要方法:
- 在Ti基板上喷沉积MnWO4/FeCoNi Mott-Schottky异质连接.
- 电化学表征,包括在照明下对HER和OER的超电位测量.
- 在高电流密度下对双电极光辅助电解电池进行长期稳定性测试.
主要成果:
- MnWO4/FeCoNi异质连接电极表现出增强的光吸收和快速光生成的电子孔对分离.
- 在10 mA cm−2的照明下,在HER下达到64 mV的低超电位,在OER下达到204 mV的超电位.
- 电极在 500 和 1000 mA cm-2.2 的电流密度下表现出长期稳定性.
结论:
- 开发的MnWO4/FeCoNi Mott-Schottky异质连接是PCA-EC的高效双功能电极.
- 光生成载体和异质连接结构之间的协同效应促进了高效的HER和OER.
- 这项工作为开发用于大电流密度应用的先进光辅助水分电极铺平了道路.
相关概念视频
Schottky Barrier Diode
305
Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
305
P-N junction
480
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
480
Metal-Semiconductor Junctions
307
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
307
The Z-Scheme of Electron Transport in Photosynthesis
10.0K
The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
10.0K
Photochemical Electrocyclic Reactions: Stereochemistry
1.8K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
1.8K


