Enhancing PEM water electrolysis efficiency by reducing the extent of Ti gas diffusion layer passivation

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F18%3A43916423" target="_blank" >RIV/60461373:22310/18:43916423 - isvavai.cz</a>

Result on the web

<a href="https://link.springer.com/article/10.1007%2Fs10800-018-1174-6" target="_blank" >https://link.springer.com/article/10.1007%2Fs10800-018-1174-6</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10800-018-1174-6" target="_blank" >10.1007/s10800-018-1174-6</a>

Result language

angličtina

Original language name

Enhancing PEM water electrolysis efficiency by reducing the extent of Ti gas diffusion layer passivation

Original language description

Proton exchange membrane water electrolysis (PEM WE) suffers from several issues, such as the high cost and low stability of the electrolyser unit components. This is especially evident for an anode polarised to a high potential and in contact with an acidic membrane. Such a combination is detrimental to the vast majority of electron-conducting materials. Nowadays Ti (possessing a protective passive layer on its surface) is used as the construction material of an anode gas diffusion layer. Since the passivation layer itself is non-/semiconducting, an excessive degree of passivation leads to high surface contact resistance and to energy losses during PEM WE operation. This problem is usually solved by coating the Ti surface with precious metals. This leads to a further increase of the already very high cell investment costs. In this work an alternative method based on appropriate Ti etching (in acid) is presented. The (surface) composition of the samples treated was investigated using SEM, X-ray fluorescence and diffraction and photoelectron spectroscopy. TiHx was found in the subsurface layer. This was responsible for preventing excessive passivation of the Ti metal. The superior performance of the etched Ti gas diffusion layer (compared to non-etched) in a PEM water electrolyser was confirmed during an (&gt; 100 h) experiment with current densities of up to 1 A cm(- 2). Using the described treatment the surface contact resistance was substantially reduced and its increase during PEM WE operation was largely suppressed. As this method is very simple and cheap, it has tremendous potential for improving PEM WE process efficiency. [GRAPHICS] .

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Project

<a href="/en/project/LO1613" target="_blank" >LO1613: Future materials</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Applied Electrochemistry

ISSN

0021-891X

e-ISSN

—

Volume of the periodical

48

Issue of the periodical within the volume

6

Country of publishing house

DE - GERMANY

Number of pages

11

Pages from-to

713-723

UT code for WoS article

000432525500015

EID of the result in the Scopus database

2-s2.0-85043392102