Facilitating Electrochemical Overall Water Splitting Through Tailoring Halloysite Nanoclay‐Based Nanoarchitectonics of Ionic Environment and Gas‐Bubble Wettability
Abstract
Unwanted gas bubble adhesion at the electrode surface and its unfavorable microenvironment compromise water splitting performance by perturbing the access of electrolytes and electron transfer processes. While reported bubble‐repellent coatings promote an early detachment of gas bubbles—they mostly fail to provide a favorable ionic microenvironment for overall electrochemical water‐splitting. Here, it has experimentally and theoretically validated the impact of the synergistic association of bubble repellence and selective ionic environments on water splitting performance. Halloysite nanoclay‐based coating with tailored ionic environment and gas‐bubble wettability on nickel foam (NF) ensured a superior performance for hydrogen and oxygen evolution reactions (HER and OER) in alkaline medium (1 M KOH). Superaerophobic coatings on NF with cationic modifiers boost HER by polarizing water around the electrode surface, and anionic modifiers improve OER via facilitating OH − availability, leading to 42% and 30% lower overpotentials at a current density of 100 mA cm −2 , respectively. Eventually, it improves gas production by >60% compared to bare NF in alkaline conditions at a given potential. This strategy lowers the cell voltage required for overall water splitting by 500 ± 6 mV while sustaining a current density of 100 mA cm −2 .
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Bubbles adhering to the electrode block contact between the electrode and the electrolyte, and only after detachment can they reconnect to form a pathway and continue catalysis.
“in the process of generating bubbles, the bubbles adhering to the electrode will block the contact between the electrode and the electrolyte. Only after the bubbles are detached from the electrode can they reconnect to form a pathway and continue catalysis.”
From Advances in Surface/Interface Engineering of Under-Water Superaerophobic Electrodes for Hydrogen Evolution Reaction by Manipulating of Bubbles (2026) · cites this paper as [6]
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- Authors
- Das, J., Phad, V., Saha, D., Dutta, S., Dhabal, D., & Manna, U.
- Affiliations
- Indian Institute of Technology Guwahati (IN)
- Corresponding author
- Dhabal, Debdas
- Manna, Uttam
- Venue
- Advanced Materials
- Publisher
- Wiley
- Published
- 2025-11-10
- Volume
- 38
- Issue
- 6
- Pages
- e15325-e15325
- ISSN
- 0935-9648 (ISSN-L)
- 1521-4095
- OpenAlex
- W4416093558
- Cited by
- 9
- References
- 33
- Citations by year
- 2026: 9
- FWCI
- 1.24
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Advanced Materials (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Ministry of Electronics and Information technology (no. 5(1)/2022‐NANO)
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › CO2 Reduction Techniques and Catalysts
- Physical Sciences › Environmental Science › Water Science and Technology › Minerals Flotation and Separation Techniques
- Keywords
- overall water splitting, halloysite nanoclay, nickel foam, hydrogen evolution reaction, oxygen evolution reaction, alkaline water electrolysis, bubble adhesion, electrocatalysis
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