.png){kind=icon}
.png){kind=icon}
Return
Friction-induced electrochemical activation of platinum group metals via electromechanical coupling
.png){kind=icon}
OA
AI
DOI：10.1016/j.mattod.2026.103323.png)
.png){kind=icon}
.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Platinum group metals (PGMs), long considered chemically inert, exhibit unexpected reactivity at the metal-water interface when subjected to simultaneous friction and electric fields. This tribo-electrochemical coupling unveils a reaction regime fundamentally different from conventional electrochemical or mechanical activation. Here, we demonstrate that friction, coupled with a positive surface potential, drives the rapid formation of submicron oxide layers on platinum surfaces. We propose that friction lowers activation energy barriers and enhances mass transport, thereby accelerating anodic oxidation through a stress-augmented thermally activated mechanism. The resulting nanostructured oxides apparently exhibit higher electrocatalytic activity than that of metallic platinum, offering promising potential for microscale sensors and catalytic microreactors. Notably, this localized oxidation also occurs in other PGMs, indicating a broadly applicable strategy for activating inert metals via electromechanical coupling.
Keywords:
Friction
Electromechanical coupling
Electrocatalytic activity
Platinum-group metals (PGMs)
Localized oxidation
PGM
Platinum group metal
Ru
ruthenium
Rh
rhodium
Pd
palladium
Os
osmium
Ir
iridium
Pt
platinum
HER
hydrogen evolution reaction
RE
reference electrode
WE
work electrode
CE
counter electrode
SEM
scanning electron microscope
EDS
x-ray spectroscopy
XPS
x-ray photoelectronic spectroscopy
TOF-SIMS
time-of-flight secondary ion mass spectrometry
3D
three-dimensional
TEM
transmission electron microscope
iDPC-STEM
integrated differential phase contrast scanning transmission electron microscopy
AES
Auger electron spectroscopy
HRTEM
high-resolution transmission electron microscopy
SAED
selected area electron diffraction
TSPD
tribological shear plastic deformation
ntDRX
nano-twinning assisted dynamic recrystallization
ZDDP
zinc dithiophosphate
Φ
plasticity index
Eon and Eoff
energy barriers for the binding and un-binding
OER
oxygen evolution reaction
LSV
linear sweep voltammetry
SG-TC
substrate generation-tip collection
AI Summary
Key information extracted from the uploaded paper, including a brief overview, abstract, background, key highlights, visual analysis, and future outlook.
Journal
M
IF:
22
Papers:
363
Citations:
0
View more organizations