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. Author manuscript; available in PMC: 2017 Aug 10.
Published in final edited form as: Chem Rev. 2016 Jun 29;116(15):8693–8749. doi: 10.1021/acs.chemrev.6b00180

Figure 49.

Figure 49

Examples of the [Ni(P2N2)2] family of electrocatalysts mediate both H2 oxidation (counterclockwise) and evolution (clockwise).86 This cycle is a simplification that neglects certain side pathways, and the order of the steps depends on the identities of substituents R and R′.