镍钒水滑石电极用于可放大电催化5-羟甲基糠醛氧化耦合产氢
李美然, 宋英杰, 万鑫, 李洋, 罗毅奇, 贺业亨, 夏博文, 周华, 邵明飞
【物理化学学报】doi: 10.3866/PKU.WHXB202306007
可再生能源驱动的电催化水裂解是获取绿氢的重要途径,但受到缓慢的阳极析氧反应(OER)限制。使用热力学有利的5-羟甲基糠醛氧化反应(HMFOR)代替OER的电解水制氢耦合氧化策略提供了一种降低制氢能耗的有效策略,同时可以生产高附加值的有机含氧化合物,如2, 5-呋喃二甲酸(FDCA)。在该领域,大量工作集中于催化剂工程以获得更好的催化活性和产物选择性。然而,很少有研究关注到5-羟甲基糠醛(HMF)的规模化氧化制备FDCA。为此,我们合成了一种镍钒水滑石(NiV-LDH)催化剂用于高效HMFOR,在1.52 V vs. RHE (可逆氢电极)下,电流密度100 mA∙cm−2时FDCA的法拉第效率高达94.6%。与OER相比,HMFOR将对应的氢气生产速率提高了两倍。作为概念验证,我们使用流动反应器展示了连续且可规模化的HMFOR,在10 A条件下,实现了94.8%的高HMF单程转化率和98.5%的高FDCA选择性。
关键词: 电催化水分解耦合制氢, 层状双金属氢氧化物, 5-羟甲基糠醛, 2,5-呋喃二甲酸
Synergistic nitrogen doping and carbon support in TiO2 for enhanced photocatalytic degradation of methylene blue and oxytetracycline
Ruru MA, Yingjie SONG, Yahui LI, Ermin ZHOU, Deqiang LI, Xiaojuan HUANG, Jun LI
【无机化学学报】doi: 10.11862/CJIC.20250221
In this study, sawdust served as a carbon source and urea as a nitrogen source to synthesize carbon- supported, nitrogen-doped TiO2 composites via a one-pot solvothermal method. The composites were characterized using FTIR, powder X-ray diffraction, X-ray photoelectron spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy, thermogravimetry-derivative thermogravimetry, scanning electron microscopy-energy dispersive spectroscopy, and transmission electron microscopy. Results indicated that all synthesized composites exhibit the anatase phase, with those calcined at 800 ℃ demonstrating enhanced crystallinity. Nitrogen is incorporated into the TiO2 lattice, while carbon is predominantly located on the surface. Photodegradation experiments showed that 20 mg of composite N-TiO2/C-800 achieved degradation rates of 93.4% for methylene blue (20 mg·L-1, 50 mL) and 99.4% for oxytetracycline (20 mg·L-1, 50 mL) within 30 min. Free radical capture experiments indicated that h+ was the primary active species in the photocatalytic degradation process.
关键词: N-TiO2/C, photocatalysis, visible light, methylene blue, oxytetracycline, degradation

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