硫化物
X射线光电子能谱
拉曼光谱
无机化学
硫酸盐
吸附
金属
化学
兴奋剂
催化作用
动力学
吸收(声学)
材料科学
化学工程
物理化学
冶金
工程类
复合材料
物理
光学
量子力学
生物化学
光电子学
作者
Fitri Nur Indah Sari,Min-Tsung Ke,Yan‐Jia Huang,Tang Zheng,Yen Hsun Su,Jyh‐Ming Ting
标识
DOI:10.1016/j.apsusc.2023.159187
摘要
Enhancement of urea oxidation reaction (UOR) activity of NiFe sulfide via metal doping, including V, Zn, Cr, Ag, and Ti, is demonstrated. X-ray photoelectron and absorption spectroscopy analyses show different degrees of electronic structure modulation of the Ni site due to the doping of the third metals having different t2g and eg occupancies. Cr reduces the energy needed for the in-situ formation of the oxyhydroxide, followed by Ti, V, and Ag. The reaction kinetics is accelerated by Ti, followed by Ag, Cr, and Zn. Ti also optimizes the d-band center and CO2 adsorption energy, which is supported by density functional theory calculation. Self-reconstructed sulfate-containing oxyhydroxide during UOR is demonstrated via in-situ Raman and post-transmission electron microscopy analyses. The sulfate is also found to affect the potential required for the formation of the oxyhydroxide. The optimized NiFeTi-containing sulfide exhibits an excellent UOR potential of 1.36 V at 100 mA cm−2 and is stable up to 80-h. This work provides a strategy and deep understanding in enhancing UOR performance of sulfide catalyst.
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