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Dual-Optimized Medium-Entropy Alloy Heterojunction:
Synergistically Enhancing Surface Kinetics and Interfacial Mass Transfer
for Hydrazine-Assisted Hydrogen Evolution
Minghui Hao (6179348)
Chunlei Chang (16317019)
Chunhu Li (13119467)
Ruohan Yang (13973283)
Zi Li (223785)
Dongcai Shen (20683700)
Wentai Wang (14265357)
Biophysics
Space Science
Physical Sciences not elsewhere classified
Medicine
Biotechnology
Evolutionary Biology
Ecology
Biological Sciences not elsewhere classified
Infectious Diseases
Computational Biology
topological transformation strategy
study successfully designed
phase contact lines
interfacial mass transfer
featuring discontinuous three
entropy heterojunction electrocatalyst
entropy alloy heterojunction
desorption energy barrier
bubble sizes released
− 6 mv
assisted hydrogen evolution
high current densities
4 </ sub
277 </ sub
226 </ sub
209 </ sub
2 </ sub
hydrazine oxidation reaction
current densities
reaction kinetics
gas evolution
28 mv
current density
synergistic effect
stable gas
requiring overpotential
oer ),
markedly smaller
form pt
evolving electrocatalysts
enhanced n
electrode requires
designing efficient
contributing significantly
adsorption capacity
247 v
To
address the prominent “bubble shielding” effect
at high current densities during hydrazine oxidation reaction (HzOR)
as a replacement for the traditional oxygen evolution reaction (OER),
this study successfully designed a medium-entropy heterojunction electrocatalyst
(Co<sub>0.226</sub>Fe<sub>0.277</sub>Ni<sub>0.209</sub>Mo<sub>0.288</sub>/MoS<sub>2</sub>/CC) featuring discontinuous three-phase contact
lines through a topological transformation strategy. The catalyst
exhibits unique superwetting properties (superhydrophilic/superaerophobic),
significantly enhancing bubble detachment efficiency during gas evolution.
In situ microscopic observations reveal that the bubble sizes released
from the surface are markedly smaller than those form Pt/C/CC under
current densities of 10 and 100 mA cm<sup>–2</sup>. In addition,
the Co<sub>0.226</sub>Fe<sub>0.277</sub>Ni<sub>0.209</sub>Mo<sub>0.288</sub>/MoS<sub>2</sub>/CC achieves dual optimization of reaction kinetics
and interfacial mass transfer through the synergistic effect of enhanced
N<sub>2</sub>H<sub>4</sub> adsorption capacity and reduced H* desorption
energy barrier, achieves outstanding bifunctional performance in hydrazine-assisted
water electrolysis system, requiring overpotential of only 28 mV for
HER and work-potential of −6 mV for HzOR to reach a current
density of 10 mA cm<sup>–2</sup>. Furthermore, a membrane-free
overall hydrazine splitting (OHzS) system with Co<sub>0.226</sub>Fe<sub>0.277</sub>Ni<sub>0.209</sub>Mo<sub>0.288</sub>/MoS<sub>2</sub>/CC
as an electrode requires only 0.247 V to deliver 100 mA cm<sup>–2</sup>. This work provides novel insights for designing efficient and stable
gas-evolving electrocatalysts, contributing significantly to advancing
sustainable energy conversion technologies.
2026-09-30T00:00:00Z
Dataset
Media
10.1021/acs.inorgchem.6c03596.s003
https://figshare.com/articles/media/Dual-Optimized_Medium-Entropy_Alloy_Heterojunction_Synergistically_Enhancing_Surface_Kinetics_and_Interfacial_Mass_Transfer_for_Hydrazine-Assisted_Hydrogen_Evolution/34037456
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