Boosting water oxidation kinetics of BiVO4 through a metal-organic co-catalyst enriched with phosphate groups (Co,Fe-NTMP): Insights from LMCT mechanism and DFT study

被引：0

作者：

Saad, Alaa Magdy ^{[1
]}

Mady, Amr Hussein ^{[1
,2
]}

Sayed, Mostafa Saad ^{[3
]}

Kim, Gayeong ^{[1
]}

Kim, Minkyu ^{[1
]}

Kim, Woo Kyoung ^{[1
]}

机构：

[1] Yeungnam Univ, Sch Chem Engn, Gyongsan 38541, Gyeongbuk, South Korea

[2] Egyptian Petr Res Inst, Petrochem Dept, Nasr City 11727, Cairo, Egypt

[3] Egyptian Petr Res Inst, Anal & Evaluat Dept, Nasr City 11727, Cairo, Egypt

来源：

APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY | 2025年 / 370卷

关键词：

Photoelectrochemical; Metal-organic complex; Hydrogen production; LMCT; BiVO4; NITRILOTRIS(METHYLENEPHOSPHONIC ACID); SURFACE RECOMBINATION; PHOTOANODE; FRAMEWORK; PERFORMANCE; SEPARATION; COMPLEXES; EFFICIENT;

D O I：

10.1016/j.apcatb.2025.125163

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The primary challenges of BiVO4 include its poor stability and inefficient electron-hole pair separation. To enhance BiVO4 photoanode oxygen evolution reaction (OER), a Co,Fe- nitrilotris (methylene phosphonic acid) (Co,Fe-NTMP) metal-organic co-catalyst was developed and applied to the BiVO4 photoelectrode surface using the SILAR technique. The proposed approach significantly improved charge separation and transfer. The optimized BiVO4/Co,Fe-NTMP photoanode exhibited a current density of 2.6 mA cm-2 at 1.23 V vs. RHE, representing more than a fivefold increase compared to bare BiVO4 (0.5 mA cm-2 at 1.23 V vs. RHE) under illumination of AM 1.5 G without a sacrificial agent. Additionally, the applied bias photon-to-current efficiency (ABPE) of BiVO4/Co,Fe-NTMP reached 0.58 % at 0.83 V vs. RHE. The Delta OCP measurements indicated improved band bending and enhanced charge separation following the Co,Fe-NTMP coating. The BiVO4/Co,Fe-NTMP photoanode also demonstrated remarkable stability for 9000 s, which can attributed to the formation of ligandto-metal charge transfer (LMCT), which facilitates efficient electron transport. This mechanism was substantiated by XPS and DFT analyses.

引用

页数：12

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