相关实验视频

Updated: Jan 6, 2026

Solar-Driven Electrochemical Green Fuel Production from CO2 and Water Using Ti3C2Tx MXene-Supported CuZn and NiCo Catalysts

Solar-Driven Electrochemical Green Fuel Production from CO₂ and Water Using Ti₃C₂T_x MXene-Supported CuZn and NiCo Catalysts

Published on: November 7, 2025

太阳能驱动的光电化学氧化水在n型氧化阳极上

Naoki Hirayama¹, Hiroko Nakata¹, Haruki Wakayama¹

¹Department of Chemistry, School of Science , Tokyo Institute of Technology , 2-12-1-NE-2 Ookayama , Meguro-ku, Tokyo 152-8550 , Japan.

Journal of the American Chemical Society

|October 8, 2019

概括

这项研究引入了一种稳定的氧化 (Pb₂Ti₂O_5.4F_1.2) 光电极,用于可见光水氧化. 这种混合离子材料表现出特殊的稳定性和高效的水分离,不需要促进剂.

科学领域:

材料科学
摄影化学
电化学

背景情况:

混合化合物如氧化物和氧硫化物被探索为可见光水氧化光电极.
然而,大多数受光生成孔的氧化降解影响,限制了它们的稳定性.
开发稳定的光阳极对于高效的太阳能燃料生产至关重要.

研究的目的:

研究一种新型氧化物Pb₂Ti₂O_5.4F_1.2的潜力,作为可见光水氧化的稳定光电极.
评估其光电化学性能,包括光电流生成,发作潜力和稳定性.
将其性能与没有氧化水促进剂进行比较.

主要方法:

合成Pb₂Ti₂O_5.4F_1.2粒子并将其沉积在透明导电玻璃 (FTO) 支上.
一个TiO₂覆盖层的后沉积形成光电极结构.
在模拟的阳光下进行光电化学测量 (AM1.5G),以评估光电流,发作潜力和稳定性.
水氧化产物分析 (O₂) 和法拉第效率的确定.

主要成果:

Pb₂Ti₂O_5.4F_1.2的频段间隙约为 2.4 eV,使可见光吸收 (λ <520 nm).
该光电极产生了一个稳定的阳极光电流,具有负开启电位 (-0.6V与NHE),独立于pH值.
即使没有水氧化促进剂 (例如CoO_x),也观察到异常稳定性.
加载CoO_x提高了光响应的2-3倍,在AM1.5G光下实现了O₂演变的93%法拉第效率,应用电位<1.23V.
在4个小时的运行过程中,光电极没有失效.

结论:

Pb₂Ti₂O_5.4F_1.2是第一个用于可见光水氧化的稳定,混合离子氧化光电极.
它的稳定性和性能,即使没有促进剂,也使其与其他混合离子光电极区别开来.
这种材料为高效且持久的光电化学水分解提供了有前途的途径.

更多相关视频

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions

Published on: October 5, 2019

Electrospinning of Photocatalytic Electrodes for Dye-sensitized Solar Cells

Electrospinning of Photocatalytic Electrodes for Dye-sensitized Solar Cells

Published on: June 28, 2017

相关概念视频

Oxygenic Photosynthesis

Oxygenic Photosynthesis

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...

Voltaic/Galvanic Cells

Voltaic/Galvanic Cells

Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...