Unveiling the nanoscale frontier: innovating with nanoporous model
electrodes

Date:
June 2, 2023
Source:
Tohoku University
Summary:
Researchers have introduced a next-generation model membrane
electrode that promises to revolutionize fundamental electrochemical
research.


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==========================================================================
FULL STORY ========================================================================== Researchers at Tohoku University and Tsinghua University have introduced a next-generation model membrane electrode that promises to revolutionize fundamental electrochemical research. This innovative electrode,
fabricated through a meticulous process, showcases an ordered array of
hollow giant carbon nanotubes (gCNTs) within a nanoporous membrane,
unlocking new possibilities for energy storage and electrochemical
studies.

The key breakthrough lies in the construction of this novel electrode. The researchers developed a uniform carbon coating technique on anodic
aluminum oxide (AAO) formed on an aluminum substrate, with the barrier
layer eliminated.

The resulting conformally carbon-coated layer exhibits vertically aligned
gCNTs with nanopores ranging from 10 to 200 nm in diameter and 2 mm to
90 mm in length, covering small electrolyte molecules to bio-related
large matters such as enzymes and exosomes. Unlike traditional composite electrodes, this self- standing model electrode eliminates inter-particle contact, ensuring minimal contact resistance -- something essential for interpreting the corresponding electrochemical behaviors.

"The potential of this model electrode is immense," stated Dr. Zheng-Ze
Pan, one of the corresponding authors of the study. "By employing the
model membrane electrode with its extensive range of nanopore dimensions,
we can attain profound insights into the intricate electrochemical
processes transpiring within porous carbon electrodes, along with
their inherent correlations to the nanopore dimensions." Moreover, the
gCNTs are composed of low-crystalline stacked graphene sheets, offering unparalleled access to the electrical conductivity within low- crystalline carbon walls. Through experimental measurements and the utilization of
an in-house temperature-programmed desorption system, the researchers constructed an atomic-scale structural model of the low-crystalline
carbon walls, enabling detailed theoretical simulations. Dr. Alex Aziz,
who carried out the simulation part for this research, points out,
"Our advanced simulations provide a unique lens to estimate electron transitions within amorphous carbons, shedding light on the intricate mechanisms governing their electrical behavior." This project was
led by Prof. Dr. Hirotomo Nishihara, the Principal Investigator of
the Device/System Group at Advanced Institute for Materials Research (WPI-AIMR). The findings are detailed in one of materials science's
top-level journal, " Advanced Functional Materials.

Ultimately, the study represents a significant step forward in our understanding of amorphous-based porous carbon materials and their
applications in probing various electrochemical systems.

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========================================================================== Story Source: Materials provided by Tohoku_University. Note: Content
may be edited for style and length.


========================================================================== Journal Reference:
1. Hongyu Liu, Zheng‐Ze Pan, Alex Aziz, Rui Tang, Wei Lv,
Hirotomo
Nishihara. Nanoporous Membrane Electrodes with an Ordered Array
of Hollow Giant Carbon Nanotubes. Advanced Functional Materials,
2023; DOI: 10.1002/adfm.202303730 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2023/06/230602115054.htm

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