【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。
【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.
