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Recommended practice to report selectivity in electrochemical synthesis of H2O2

Two different types of H2O2 selectivity are reported for the electrochemical synthesis of H2O2: molar fraction selectivity and Faradaic selectivity. Here we revisit their definitions and discuss the best way to report H2O2 selectivity, which can help to avoid misunderstandings or unfair performance comparisons in this growing field.

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Fig. 1: Trends of 2e-ORR and 4e-ORR publications in recent years.
Fig. 2: The relationship between the two types of selectivity.


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This work was not directly funded. H.W. is a CIFAR Azrieli Global Scholar in the Bio-inspired Solar Energy Program. C.X. thanks the support from J. Evans Attwell-Welch Postdoctoral Fellowship. H.W. acknowledges support from the Welch Foundation Research Grant.

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The project was conceptualized by C.X. and H.W., and supervised by H.W.; C.X. and H.W. wrote the manuscript with input from J.K.

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Correspondence to Haotian Wang.

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The authors declare no competing interests.

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Xia, C., Kim, J.Y.(. & Wang, H. Recommended practice to report selectivity in electrochemical synthesis of H2O2. Nat Catal 3, 605–607 (2020).

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