诱导的电子增强了O2激活电催化H的生产
Yingbi Chen1, Qingguo Feng2, Yu Bai1
1State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China.
ACS nano
|August 2, 2025
概括
一种新的诱导电子增强了电化学氧降解,实现了超过90%的过氧化生产选择性. 这一突破为电催化反应和潜在应用 (如抗生素降解) 提供了洞察力.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 电化学两电子氧降解反应 (2e-ORR) 产生过氧化 (H2O2) 是可取的,但受选择性和活性差的限制.
- 开发用于选择性H2O2生产的高效催化剂仍然是电化学中的一个重大挑战.
研究的目的:
- 展示一种诱导的电子,用于增强电化学2e-ORR.
- 研究2e-ORR.期间氧气激活和中间体形成的机制.
- 探索开发系统的潜在应用,例如污染物降解.
主要方法:
- 用诱导的电子催化剂的制造和特征.
- 电化学测量,包括循环电压测量和时测量,以评估ORR性能.
- 现场拉曼光谱和密度函数理论 (DFT) 计算以阐明反应机制.
- 评估催化剂在降解抗生素和大肠杆菌的有效性.
主要成果:
- 诱导电子在0.20.7V电位范围内实现了>90%的H2O2选择性 (93.5%在0.5V).
- 在0.6V下观察到H2O2生产的94.2%的高法拉第效率.
- 在现场的拉曼和DFT计算显示了增强的O2吸附/激活和早期形成的*OOH中间体.
- 该系统显示了抗生素和大肠杆菌在现场降解的潜力.
结论:
- 诱导的电子有效地增强了电催化2e-ORR,提供了高的H2O2选择性和活性.
- 该研究提供了对氧气激活和中间稳定的机制性见解,扩大了对电子机制的理解.
- 在污染物降解中的应用表明了这种电催化系统的实际潜力.
相关概念视频
Oxygenic Photosynthesis
187
Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
187
Electron Transport Chains
102.7K
The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
The ETC is comprised of...
The ETC is comprised of...
102.7K
The Z-Scheme of Electron Transport in Photosynthesis
10.5K
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...
10.5K
Anoxygenic Photosynthesis
151
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...
151
ATP Driven Pumps I: An Overview
8.6K
ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and...
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and...
8.6K
Photosystem I
64.4K
Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
64.4K


