5, 10, 15, 20-tetra(N-methylpyridinium-4′-yl)porphyrinate tin(IV) (SnTMPyP) was found to exhibit two-electron water oxidation to form hydrogen peroxide as a primary product initiated by electrochemical one-electron oxidation. Dioxygen was also formed by the further two-electron oxidation of hydrogen peroxide on the anode. Isotope labelling experiment using H₂¹⁸O and enzyme catalase that converts H₂O₂ into O₂ revealed an incorporation of ¹⁸O into the oxidation products, indicating the two-electron oxidation of water in the electrolysis catalysed by SnTMPyP. The overpotential of forming H₂O₂ under the practical condition is 370 mV. The Faradaic yield of the water oxidation was almost quantitative both under the basic (pH 10.9) and the nearly neutral conditions (pH 8.5), though the reactivity was much higher under the basic condition.

发现5、10、15、20-四（N-甲基吡啶-4'-基）卟啉锡（IV）（SnTMPyP）表现出两电子水氧化作用，形成过氧化氢，这是通过电化学单电子引发的主要产物氧化。还通过阳极上过氧化氢的进一步两电子氧化来形成双氧。使用H ₂ ¹⁸ O和将H ₂ O ₂转化为O _2的酶过氧化氢酶进行的同位素标记实验表明，¹⁸ O结合到氧化产物中，表明在SnTMPyP催化的电解过程中水的两电子氧化。形成H ₂ O ₂的过电势在实际条件下为370 mV。在碱性条件下（pH 10.9）和中性条件下（pH 8.5），水氧化法拉第酸的收率几乎是定量的，尽管在碱性条件下反应性要高得多。