Effect of Heat Treatment on Carbon Supported PtAu Based Bimetallic Nanomaterials for Improved Glucose Sensitivity and Electrocatalytic Performance
Open accessAbstract
Carbon supported PtAu based bimetallic nanomaterials were synthesized, heat treated (450°C, 2 hrs) and characterized using thermo-gravimetric analysis (TGA/DTG), scanning electron microscopy (SEM), energy-dispersive X-ray spectrometry (EDX) and X-ray diffraction (XRD). Cyclic voltammetry was employed in order to confirm the typical metallic electrochemical response of the materials and hydrodynamic amperometry was employed for direct glucose determination. The optimized nanocomposite material (Pt 1 Au 3 /C) exhibited excellent sensitivity response (27.0 μAmM −1 cm −2 , LoD 2.9 μM) toward glucose sensing, over the range 0–10 mM glucose at E app = 0.35 V vs Ag/AgCl under neutral conditions (pH 7.4). The sensitivity (μAmM −1 cm −2 per μg of Pt) for heat treated Pt 1 Au 3 /C is 3.46 times that observed for untreated Pt 1 Au 3 /C and 4.36 times that shown by heat treated Pt 1 Au 1 /C. All these results clearly demonstrated the effect of heat-treatment and the role of Au in improving catalytic activity and in effective Pt surface utilization, collectively resulting in excellent response toward glucose electro-oxidation. Overall, the materials demonstrated sensitive and reproducible responses, while eliminating the pH, temperature and lifetime issues associated with enzyme based electrodes. These decorated nanoscale materials are capable of large scale production and are of great promise in the quantification of glucose in real clinical samples as well as can be used in food industry, fermentation/bio-process control and industrial processes.
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High-temperature heat treatment can cause agglomeration of particles, reduction of specific surface area, and broadening of particle size distribution.
“However, high-temperature heat treatment can cause agglomeration of particles, reduction of specific surface area, and broadening of particle size distribution.”
From Carbon-Supported Pt-Based Alloy Electrocatalysts for the Oxygen Reduction Reaction in Polymer Electrolyte Membrane Fuel Cells: Particle Size, Shape, and Composition Manipulation and Their Impact to Activity (2015) · cites this paper as [234]
In “Glucose electro-oxidation studies” (page unavailable), the paper says heat treatment can increase particle size and thereby reduce catalyst active area, supporting the surface-area concern in substance. It does not establish that high-temperature treatment causes agglomeration or broadens the particle-size distribution; it reports treatment at 450 °C without agglomeration and cites improved particle distribution at 400–550 °C. (LLM, conf=0.86)
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- Authors
- Singh, B., & Dempsey, E.
- Affiliations
- Institute of Technology Tallaght (IE)
- Venue
- ECS Journal of Solid State Science and Technology
- Publisher
- The Electrochemical Society
- Published
- 2012
- Volume
- 1
- Issue
- 3
- Pages
- M25-M32
- ISSN
- 2162-8769 (ISSN-L)
- 2162-8777
- OpenAlex
- W2170209620
- Cited by
- 7
- References
- 38
- Citations by year
- 2019: 2 · 2016: 1 · 2015: 3 · 2014: 1
- FWCI
- 0.82
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- ECS Journal of Solid State Science and Technology (publishedVersion)
- Funders
- University of Limerick
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Electrochemical sensors and biosensors
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
- Physical Sciences › Chemistry › Electrochemistry › Electrochemical Analysis and Applications
- Keywords
- carbon-supported catalysts, heat treatment, electrocatalytic glucose oxidation, glucose biosensor, electrocatalysis, platinum utilization, amperometric sensing
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