Spherical cluster heterojunction engineering of NiFeP/g-C3N4 for efficient oxygen evolution reaction in alkaline solution.
J Colloid Interface Sci
; 674: 266-278, 2024 Nov 15.
Article
em En
| MEDLINE
| ID: mdl-38936083
ABSTRACT
The construction of heterojunctions can reduce the energy barrier for the oxygen evolution reaction (OER), which is crucial for the design of efficient electrocatalysts. A novel OER electrocatalyst, composed of g-C3N4-supported NiFeP spherical nanoclusters, was successfully synthesized using a simple hydrothermal method and a gas-phase precipitation method. Benefiting from its unique spherical nanocluster structure and strong electronic interactions among Ni, Fe, and P, the catalyst exhibited outstanding performance under alkaline conditions, with an overpotential of only 232â¯mV at a current density of 10â¯mAâ¯cm-2 and a Tafel slope of 103â¯mV dec-1. Additionally, the electrical resistance of NiFeP/g-C3N4 (Rctâ¯=â¯5.1â¯Ω) was much lower than that of NiFeP (Rctâ¯=â¯10.8â¯Ω) and layered g-C3N4 (Rctâ¯=â¯44.8â¯Ω). The formation of a Schottky barrier heterojunction efficiently reduced electron transfer impedance during the OER process, accelerating the electron transfer from g-C3N4 to NiFeP, enhancing the carrier concentration, and thereby improving the OER activity. Moreover, The robust g-C3N4 chain-mail protects NiFeP from adverse reaction environments, maintaining a balance between catalytic activity and stability. Furthermore, ab initio molecular dynamics (AIMD) and density functional theory (DFT) were conducted to explore the thermal stability and internal electron transfer behavior of the cluster heterojunction structure. This study offers a broader design strategy for the development of transition metal phosphide (TMPs) materials in the oxygen evolution reaction.
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MEDLINE
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En
Ano de publicação:
2024
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Article