EDTA derived graphene supported porous cobalt hexacyanoferrate nanospheres as a highly electroactive nanocomposite for hydrogen peroxide sensing

• Published in: Catalysis science & technology 2022-04, Vol.12 (7), p.2369-2383
• Main Authors: Banavath, Ramu, Srivastava, Rohit, Bhargava, Parag
• Format: Article
• Language: English
• Subjects: Chelation; Chemical sensors; Cobalt; Electron transfer; Ethylenediaminetetraacetic acids; Exfoliation; Graphene; Hydrogen peroxide; Industrial applications; Liquid phases; Nanocomposites; Nanospheres; Oxidation; Sensitivity; Sensors
• ISSN: 2044-4753; 2044-4761
• DOI: 10.1039/d2cy00003b

The importance of hydrogen peroxide (H 2 O 2 ) determination has been rapidly increasing due to its significant usage in biological and industrial applications. Hence, highly sensitive and selective sensors are required for H 2 O 2 determination. This work demonstrates the development of highly sensitive electrochemical H 2 O 2 sensors by using a spray exfoliated graphene and porous cobalt hexacyanoferrate nanosphere (Gr/P-CoHCF-NSPs) composite. The liquid phase high-pressure spray exfoliation technique was used to exfoliate high-quality graphene for electrochemical sensing applications. The EDTA chelation strategy was used for the homogeneous formation of P-CoHCF-NSPs on spray exfoliated graphene surfaces. The large electroactive surface area and excellent electron transfer ability of spray exfoliated graphene significantly enhanced the H 2 O 2 sensing ability of the composite. The synthesized Gr/P-CoHCF-NSPs composite is highly reactive towards the oxidation of H 2 O 2 . The sensitivity of the fabricated sensor was 914 μA mM −1 cm −2 in a linearity range of 1 to 1000 μM. The LOD of the fabricated sensors was around 1 μM. Comparing the fabricated sensors with recently developed H 2 O 2 sensors indicates a significant improvement in sensitivity and LOD. The interference study of the fabricated sensors revealed their highly selective nature towards H 2 O 2 sensing. The recovery and real sample analysis of the fabricated sensors confirmed that the Gr/P-CoHCF-NSPs based H 2 O 2 sensors are potential candidates for H 2 O 2 detection in real samples. Developed a highly electroactive graphene and porous cobalt hexacyanoferrate nanosphere (Gr/P-CoHCF-NSPs) composite for H 2 O 2 sensing by using EDTA chelation strategy.