Microtubular electrodes: An emerging electrode configuration for electrocatalysis, bioelectrochemical and water treatment applications

Rabiee, Hesamoddin ORCID: https://orcid.org/0000-0003-0439-955X and Ge, Lei ORCID: https://orcid.org/0000-0003-2989-0329 and Hu, Shihu and Wang, Hao and Yuan, Zhiguo (2022) Microtubular electrodes: An emerging electrode configuration for electrocatalysis, bioelectrochemical and water treatment applications. Chemical Engineering Journal:138476. ISSN 1385-8947


Abstract

Electrochemical processes have attracted much attention as they can be empowered by renewable electricity for zero-emission processes under ambient conditions. Applications of electrochemistry in various areas such as electrocatalysis (e.g., water electrolysis, CO2 reduction), (waste)water treatment, fuel cells, and microbial processes have been recently emerging. Electrode design is a crucial feature in electrochemical systems. In some applications, porous electrodes are required to maximize the reaction sites and participate in reactants delivery, such as gas-diffusion electrodes (GDEs) for gas-phase electrolysis or membrane electrodes for water treatment. Planar shape porous electrodes are the conventional configuration with some drawbacks; for example, planar GDEs are made in multiple layers and are relatively complex to manufacture on large scales. Recently, microtubular (or hollow fiber) shape electrodes have been introduced as an alternative due to several advantages such as a higher active surface area to the volume ratio, small electrolyzer footprint, ease of processability, etc. This review presents a critical overview of the design and fabrication of microtubular electrodes and the structure-performance relationship. After that, the recent advances of microtubular electrodes in three main categories, including gas-phase electrocatalysis, (waste)water treatment, and bioelectrochemical systems, are discussed, with more focus on gas electrolysis wherein microtubular electrodes act as GDEs. GDEs for gas electrocatalysis are of great significance as they effectively boost reaction rate by continuously delivering reactant feeds to the reaction sites, resolving the issue of mass transport resistance, and microtubular GDEs can address several issues of planar GDEs. In the last section, future research opportunities are suggested to showcase the promises of microtubular electrodes as a versatile electrode configuration for electrochemical applications.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 09 Aug 2022 22:31
Last Modified: 28 Sep 2022 04:49
Uncontrolled Keywords: Electrode design; Microtubular electrodes; Electrocatalysis; Gas-diffusion electrode; Bioelectrochemical systems; Electrochemical water treatment
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401605 Functional materials
34 CHEMICAL SCIENCES > 3403 Macromolecular and materials chemistry > 340301 Inorganic materials (incl. nanomaterials)
40 ENGINEERING > 4004 Chemical engineering > 400404 Electrochemical energy storage and conversion
Identification Number or DOI: https://doi.org/10.1016/j.cej.2022.138476
URI: http://eprints.usq.edu.au/id/eprint/50880

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