Nitrogen-rich core-shell structured particles consisting of carbonized zeolitic imidazolate frameworks and reduced graphene oxide for amperometric determination of hydrogen peroxide
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Core-shell structured particles were prepared from carbonized zeolitic imidazolate frameworks (ZIFs) and reduced graphene oxide (rGO). The particles possess a nitrogen content of up to 10.6%. The loss of nitrogen from the ZIF is avoided by utilizing the reduction and agglomeration of graphene oxide with suitable size (>2 μm) during pyrolysis. The resulting carbonized ZIF@rGO particles were deposited on a glassy carbon electrode to give an amperometric sensor for H2O2, typically operated at a voltage of −0.4 V (vs. Ag/AgCl). The sensor has a wide detection range (from 5 × 10−6 to 2 × 10−2 M), a 3.3 μM (S/N = 3) detection limit and a 0.272 μA·μM−1·cm−2 sensitivity, much higher than that of directly carbonized ZIFs. The sensor material was also deposited on a screen-printed electrode to explore the possibility of application.
KeywordsElectrochemical sensor Electrocatalyst Nitrogen doped carbon H2O2 Screen-printed electrode
Financial supports from the National Key R&D Program of China (2016YFC0200102), the National Natural Science Foundation of China (91643201 & 51608509 & 91545125 & U1662121) and Tsinghua Qingfeng Scholarship (THQF2018-16) are acknowledged.
Compliance with ethical standards
The author(s) declare that they have no competing interests.
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