In-situ growth of high entropy MOF-derived metal sulfide for exceptional water splitting performance at high current density
Journal
Materials Today Energy
Journal Volume
57
Start Page
102226
ISSN
24686069
Date Issued
2026-04
Author(s)
Chen, Ying-Yu
Kubendhiran, Subbiramaniyan
Perumal, Sakthivel
Lee, Pin-Yan
Lin, Shan-Ni
Lin, Lu-Yin
Abstract
In this work, a high-entropy MOF-74 precursor containing Fe, Co, Mn, and Mo is in situ grown on nickel foam, providing a well-integrated and conductive framework. The precursor is then carbonized under an Ar/H2 atmosphere, which partially reduces the multimetal centers to their zero-valent states, and subsequently sulfurization via chemical vapor deposition to yield a high-entropy MOF-derived metal sulfide (FeCoMnMo/NF-C-S). This sequential structural evolution leads to entropy-stabilized reconstruction, enhanced electrical conductivity, and a defect-rich surface, collectively lowering the overpotentials at each stage of synthesis. The resulting FeCoMnMo/NF-C-S demonstrates exceptional electrocatalytic performance, requiring only 36 mV for HER and 174 mV for OER at 10 mA cm−2. High current densities of 1000 mA cm−2 are achieved at overpotentials of just 295 and 309 mV for HER and OER, respectively. In a two-electrode configuration, cell voltages of 1.45 and 2.00 V enable 10 and 1000 mA cm−2. The catalyst also maintains stable operation for 120 h under both low and high current densities, confirming its bifunctional efficiency and durability. This study introduces an in-situ growth and entropy-engineered transformation strategy that integrates high-entropy chemistry with MOF-derived flower-like nanostructures, enabling a uniquely efficient and durable bifunctional catalyst for overall water splitting.
Subjects
Electrocatalytic water splitting
High-entropy metal sulfides
Hydrogen evolution reaction
Metal organic framework
Overall water splitting
Oxygen evolution reaction
Publisher
Elsevier Ltd
Type
journal article