从纳米晶转化为单个原子的硫介导转化,以实现高效的性进化反应
Wendan Xue1, Qixing Zhou1, Pengfei Wang1
1Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Carbon Neutrality Interdisciplinary Science Centre/College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
概括
我们通过结合硫 (S) 原子开发了一种高度稳定的 (Os) 基催化剂,大大提高了进化反应 (HER) 的性能和耐用性,用于能源应用.
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:
- 基于 (Os) 的催化剂由于其性能和成本效益,对进化反应 (HER) 显示出希望.
- 纯Os催化剂由于强烈的中间吸附和稳定性问题而面临HER的限制.
研究的目的:
- 为 HER.开发一种高度稳定和活性的基于 Os 的催化剂.
- 调查硫 (S) 加入在提高 Os 催化剂性能方面的作用.
主要方法:
- 通过将 S 原子植入 Os 矩阵中,合成了原子分散的 Os 催化剂 (Os-SA@SNC).
- 在1.0M氧化 (KOH) 溶液中评估了催化活性和耐久性.
- 采用理论模拟和密度函数理论 (DFT) 计算.
主要成果:
- Os-SA@SNC在10 mA cm−2电流密度下实现了13 mV的低超电位,超过了商业Pt/C.
- 催化剂表现出极好的耐用性.
- DFT计算显示,S原子促进Os分散,并优化电子结构,以实现高效的HER.
结论:
- 硫的结合将Os纳米晶转化为单个原子,增强HER的稳定性和活性.
- Os-SA@SNC提供了一个有前途的替代品贵金属催化剂的能量转化.
- 这种方法为设计先进的HER催化剂和修复中的潜在应用提供了一个新的策略.
相关概念视频
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.9K
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.
10.9K
Sulfur Assimilation
79
Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...
79
Anoxygenic Photosynthesis
172
Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...
172
Preparation and Reactions of Sulfides
5.1K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
5.1K


