Cation substitution and oxygen vacancies engineering in ZnNi0.1Co1.9O4 spinel oxide for sensitive electrochemical detection of lead(ii) ions in environmental water and soil samples
6 affiliations
- 1Phenikaa University Nano Institute (PHENA), Phenikaa School of Engineering (SPE), Phenikaa University Hanoi 12116 Vietnam [email protected] [email protected] [email protected].
- 2Hung Vuong High School for the Gifted Viet Tri Ward Phu Tho province Vietnam.
- 3Air Force - Air Defense Technical Institute Hanoi 121100 Vietnam.
- 4University of Transport Technology Trieu Khuc Ward, Thanh Xuan District Hanoi Vietnam.
- 5Department of Nanoenergy Engineering, College of Nanoscience and Nanotechnology, Pusan National University (PNU) Busan 46241 Republic of Korea.
- 6Faculty of Biotechnology, Chemistry and Environmental Engineering (BCEE), Phenikaa School of Engineering (PSE), Phenikaa University Hanoi 12116 Vietnam.
Abstract
In this study, ZnNi0.1Co1.9O₄ spinel oxide structures were synthesized and used to modify screen-printed electrodes (SPEs) for sensitive Pb(ii) detection. Density functional theory (DFT) calculations confirmed that the Ni incorporation significantly modulates the electronic structure and enhance the electrical conductivity of ZnCo₂O₄ structure, thereby accelerating interfacial electron transfer kinetics and improving Pb(ii) adsorption. Benefiting from oxygen vacancies and active redox pairs (Co²⁺/Co³⁺), the ternary ZnNi0.1Co1.9O₄ structure demonstrated excellent electrocatalytic performance towards Pb(ii) sensing. Under optimized conditions, the advanced ternary ZnNi0.1Co1.9O₄ spinel oxide-based electrochemical sensor achieved a low detection limit of 0.021 µg L⁻¹ and a wide linear range of 0.1-1000 µg L⁻¹ for Pb(ii) detection. Furthermore, the proposed electrochemical sensor also demonstrated excellent potential for the reliable determination of Pb(ii) in environmental water and soil samples. This study demonstrates that ternary ZnNi0.1Co1.9O₄ structure are promising spinel oxide electrode materials for high-performance electrochemical sensors, highlighting its potential for the rapid detection of heavy-metal ions in environmental water and soil matrices.
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BibTeX
@article{huong2026cation,
title = {{Cation substitution and oxygen vacancies engineering in ZnNi0.1Co1.9O4 spinel oxide for sensitive electrochemical detection of lead(ii) ions in environmental water and soil samples}},
author = {Phung Thi Lan Huong and Vu Thi Huong Mai and Nguyen Ngoc Huyen and Le Thanh Liem and Ong Van Hoang and De Pham-Cong and Pham Tuyet Nhung and Vu Ngoc Phan and Ngo Xuan Dinh and Anh-Tuan Le},
journal = {RSC advances},
year = {2026},
month = oct,
doi = {10.1039/d6ra07507j},
url = {https://europepmc.org/article/PMC/PMC13718628},
note = {CC BY-NC},
}
RIS
TY - JOUR
TI - Cation substitution and oxygen vacancies engineering in ZnNi0.1Co1.9O4 spinel oxide for sensitive electrochemical detection of lead(ii) ions in environmental water and soil samples
AU - Phung Thi Lan Huong
AU - Vu Thi Huong Mai
AU - Nguyen Ngoc Huyen
AU - Le Thanh Liem
AU - Ong Van Hoang
AU - De Pham-Cong
AU - Pham Tuyet Nhung
AU - Vu Ngoc Phan
AU - Ngo Xuan Dinh
AU - Anh-Tuan Le
PY - 2026
DA - 2026/10/29
JO - RSC advances
DO - 10.1039/d6ra07507j
UR - https://europepmc.org/article/PMC/PMC13718628
AB - In this study, ZnNi0.1Co1.9O₄ spinel oxide structures were synthesized and used to modify screen-printed electrodes (SPEs) for sensitive Pb(ii) detection. Density functional theory (DFT) calculations confirmed that the Ni incorporation significantly modulates the electronic structure and enhance the electrical conductivity of ZnCo₂O₄ structure, thereby accelerating interfacial electron transfer kinetics and improving Pb(ii) adsorption. Benefiting from oxygen vacancies and active redox pairs (Co²⁺/Co³⁺), the ternary ZnNi0.1Co1.9O₄ structure demonstrated excellent electrocatalytic performance towards Pb(ii) sensing. Under optimized conditions, the advanced ternary ZnNi0.1Co1.9O₄ spinel oxide-based electrochemical sensor achieved a low detection limit of 0.021 µg L⁻¹ and a wide linear range of 0.1-1000 µg L⁻¹ for Pb(ii) detection. Furthermore, the proposed electrochemical sensor also demonstrated excellent potential for the reliable determination of Pb(ii) in environmental water and soil samples. This study demonstrates that ternary ZnNi0.1Co1.9O₄ structure are promising spinel oxide electrode materials for high-performance electrochemical sensors, highlighting its potential for the rapid detection of heavy-metal ions in environmental water and soil matrices.
SN - 2046-2069
ER -