过电位
分解水
析氧
电负性
材料科学
带隙
硒化物
无机化学
镁
制氢
硫化物
氢
化学
光电子学
电化学
催化作用
光催化
物理化学
冶金
硒
有机化学
电极
生物化学
作者
Jan Paštika,Filipa M. Oliveira,Vlastimil Mazánek,Zdeněk Sofer,Rui Gusmão
出处
期刊:Small
[Wiley]
日期:2022-04-03
卷期号:18 (18)
被引量:9
标识
DOI:10.1002/smll.202200355
摘要
Promising applications of metal phosphorous trichalcogenides (M2 P2 X6 or MPX3 ) have been predicted in optoelectronics, photoelectrocatalysis, and water-splitting reactions, mainly due to its wide bandgap. Transition metals are widely used in the synthesis of MPX3 , however, divalent cations of alkaline earth metals can also be constituents in MPX3 2D layered structures. Herein, MgPX3 (X = S, Se) are synthesized and their photoelectrochemical (PEC) activity is tested in the hydrogen evolution and oxygen evolution reaction (OER) regions under a wide range of wavelengths. MgPSe3 photoelectrode shows the best PEC performance with a response of 1.6 ± 0.1 mA cm-2 under 420 nm. In the light-assisted OER, a 200 mV improvement is obtained in the overpotential at 10 mA cm-2 for MgPSe3 . The better performance of MgPSe3 is consistent with its lower optical bandgap (Eg = 3.15 eV), as a result of the variation of electronegativity between selenide and sulfide.
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