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. 2020 Jun 12;13(12):2695. doi: 10.3390/ma13122695

Scheme 4.

Scheme 4

Proposed mechanism of the probable interaction of Cr3+ with ATNA/Nafion/GCE: (a) the I-V response without Cr3+; (b) the I-V response with Cr3+; (c) the comparison of the I-V response with and without Cr3+; and (d) the probable π–π* interaction between the Cr3+ ions and ATNA.