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. 2009 Aug 24;9(9):6613–6625. doi: 10.3390/s90906613

Figure 2.

Figure 2.

Cyclic voltammograms obtained at a scan of 50 mV s−1 for carbon paste modified with 20% (m/m) hollandite-type MnO2: (1 – red curve) in TRIS buffer solution (pH = 8); (2 – black curve) in TRIS buffer solution containing 4.8 × 10−4 mol L−1 of potassium ions. Hollandite manganese oxide synthesized by (A) redox precipitation; (B) sol-gel route.