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Mukundan G, Badhulika S. Nickel-cobalt metal-organic frameworks based flexible hydrogel as a wearable contact lens for electrochemical sensing of urea in tear samples. Mikrochim Acta 2024; 191:252. [PMID: 38589716 DOI: 10.1007/s00604-024-06339-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Accepted: 03/27/2024] [Indexed: 04/10/2024]
Abstract
A flexible, wearable, non-invasive contact lens sensor utilizing nickel-cobalt metal-organic framework (Ni-Co-MOF) based hydrogel is introduced for urea monitoring in tear samples. The synthesized Ni-Co-MOF hydrogel exhibits a porous structure with interconnected voids, as visualized by Scanning Electron Microscopy (SEM). Detailed structural and vibrational properties of the material were characterized using X-ray Diffraction (XRD), Fourier Transform Infrared (FTIR) spectroscopy, and Raman spectroscopy. The developed Ni-Co-MOF hydrogel sensor showcases a detection limit of 0.445 mM for urea within a linear range of 0.5-70 mM. Notably, it demonstrates exceptional selectivity, effectively distinguishing against interfering species like UA, AA, glucose, dopamine, Cl-, K+, Na+, Ca2+, and IgG. The enhanced electrocatalytic performance of the Ni-Co-MOF hydrogel electrode is attributed to the presence of Ni and Co, fostering Ni2+ oxidation on the surface and forming a Co2+ complex that acts as a catalyst for urea oxidation. The fabricated sensor exhibits successful detection and retrieval of urea in simulated tear samples, showcasing promising potential for bioanalytical applications. The binder-free, non-toxic nature of the Ni-Co-MOF hydrogel sensor presents exciting avenues for future utilization in non-enzymatic electrochemical sensing, including applications in wearable devices, point-of-care diagnostics, and personalized healthcare monitoring.
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Affiliation(s)
- Gopika Mukundan
- Department of Biomedical Engineering, Indian Institute of Technology, Hyderabad, 502285, India
| | - Sushmee Badhulika
- Department of Electrical Engineering, Indian Institute of Technology, Hyderabad, 502285, India.
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Chang J, Song F, Xu F, Wu D, Hou Y, Jiang K, Guo Y, Gao Z. Enhanced electrocatalytic efficiencies for water electrolysis and para-nitrophenol hydrogenation by self-supported nickel cobalt phosphide-nickel iron layered double hydroxide p-n junction. J Colloid Interface Sci 2024; 653:1063-1074. [PMID: 37783006 DOI: 10.1016/j.jcis.2023.09.156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 09/21/2023] [Accepted: 09/25/2023] [Indexed: 10/04/2023]
Abstract
Charge redistribution across heterointerfaces is an important tactic to enhance the catalytic activities and bifunctionality of hybrid catalysts, especially for green hydrogen production from water electrolysis and harmless electrocatalytic valorization of organics. Herein, a self-supported p-n junction catalytic electrode was constructed by tandem electrodeposition of nickel cobalt phosphide (NiCoP) and nickel iron layered double hydroxide (NiFe LDH) onto Ni foam (NF) substrate, denoted as NiCoP@NiFe LDH/NF, to enhance the electrocatalytic capabilities for water electrolysis and hydrogenation of an organic, para-nitrophenol (4-NP). Benefitting from the charge redistribution across the p-n junction, high electrocatalytic efficiencies for oxygen evolution reaction (OER, overpotential of 388 mV at 100 mA cm-2) and hydrogen evolution reaction (HER, overpotential of 132 mV at 10 mA cm-2) could be achieved concurrently by the NiCoP@NiFe LDH/NF electrode, and both overpotentials were located within the mainstream levels in this domain. The bifunctional catalytic features enabled a full water electrolysis response of 10 mA cm-2 at 1.61 V. In addition, the p-n junction electrode catalyzed the hydrogenation of 4-NP at a conversion of 100%, para-aminophenol (4-AP) selectivity of 90% and faradaic efficiency (FE) of 88% at -0.18 V. The current work offers a feasible strategy for fulfilling electrochemical H2 production and hydrogenation valorization of 4-NP pollutant by constructing a self-supported p-n junction catalytic electrode.
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Affiliation(s)
- Jiuli Chang
- School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, PR China
| | - Fengfeng Song
- School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, PR China
| | - Fang Xu
- School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, PR China
| | - Dapeng Wu
- Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environment Pollution Control, International Joint Laboratory on Key Techniques in Water Treatment, School of Environment, Henan Normal University, Xinxiang, Henan 453007, PR China
| | - Yan Hou
- School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, PR China.
| | - Kai Jiang
- Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environment Pollution Control, International Joint Laboratory on Key Techniques in Water Treatment, School of Environment, Henan Normal University, Xinxiang, Henan 453007, PR China
| | - Yuming Guo
- School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, PR China.
| | - Zhiyong Gao
- School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, PR China.
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Yuan P, Liao X, Cui H, Hao F, Xiong W, Luo H, Lv Y, Liu P. Decarboxylation-Induced Defects in MOF-Derived Ni@C Catalysts for Efficient Chemoselective Hydrogenation of Nitrocyclohexane to Cyclohexanone Oxime. ACS Catal 2023. [DOI: 10.1021/acscatal.2c05504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Affiliation(s)
- Pei Yuan
- College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China
| | - Xiaoqing Liao
- College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China
| | - Haishuai Cui
- College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China
- College of Materials and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411105, China
| | - Fang Hao
- College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China
| | - Wei Xiong
- College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China
| | - He’an Luo
- College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China
- Engineering Research Centre for Chemical Process Simulation and Optimization of Ministry of Education, Xiangtan University, Xiangtan 411105, China
- National & Local United Engineering Research Centre for Chemical Process Simulation and Intensification, Xiangtan University, Xiangtan 411105, China
| | - Yang Lv
- College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China
- Engineering Research Centre for Chemical Process Simulation and Optimization of Ministry of Education, Xiangtan University, Xiangtan 411105, China
- National & Local United Engineering Research Centre for Chemical Process Simulation and Intensification, Xiangtan University, Xiangtan 411105, China
| | - Pingle Liu
- College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China
- Engineering Research Centre for Chemical Process Simulation and Optimization of Ministry of Education, Xiangtan University, Xiangtan 411105, China
- National & Local United Engineering Research Centre for Chemical Process Simulation and Intensification, Xiangtan University, Xiangtan 411105, China
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Biswas NK, Dutta R, Srivastav A, Saxena S, Verma A, Srivastava M, Upadhyay S, Satsangi VR, Shrivastav R, Dass S. Role of electrolytic pH on the performance of nanostructured partially crystalline Nitrogen-doped Titanium Dioxide thin films in photoelectrochemical water splitting. RESULTS IN CHEMISTRY 2022. [DOI: 10.1016/j.rechem.2022.100675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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