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A Ni/Fe-based heterometallic phthalocyanine conjugated polymer for the oxygen evolution reaction

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Abstract

Ni/Fe-Based compounds have been demonstrated as efficient and economical oxygen evolution reaction (OER) electrocatalysts. However, the intrinsic reaction mechanism of the Ni/Fe-based compounds still remains unclear and under debate. Herein a Ni/Fe-based heterometallic compound Fe0.5Ni0.5Pc-CP has been prepared by a flexible method through coupling of Ni[Pc(ethynyl)4] and Fe[Pc(I)4]. The as-prepared Fe0.5Ni0.5Pc-CP exhibits an excellent performance toward the OER with the overpotential at 10 mA cm−2 as low as 317 mV, superior to those of FePc-CP (570 mV) and NiPc-CP (440 mV) and even comparable to that of commercial RuO2 (320 mV). Importantly, both the experimental and theoretical methods demonstrate that the improved OER performance of Fe0.5Ni0.5Pc-CP relative to the homometallic analogues can be attributed to the electronic interactions between the adjacent Fe and Ni atoms in Fe0.5Ni0.5Pc-CP, which facilitate the generation of the high-valence Fe/Ni species in Fe0.5Ni0.5Pc-CP and in turn boost the OER. The present result helps gain insight into the reaction mechanism of Ni/Fe-based OER electrocatalysts and further develop OER electrocatalysts with promising performance.

Graphical abstract: A Ni/Fe-based heterometallic phthalocyanine conjugated polymer for the oxygen evolution reaction

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Publication details

The article was received on 12 Oct 2019, accepted on 21 Nov 2019 and first published on 22 Nov 2019


Article type: Research Article
DOI: 10.1039/C9QI01325C
Inorg. Chem. Front., 2020, Advance Article

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    A Ni/Fe-based heterometallic phthalocyanine conjugated polymer for the oxygen evolution reaction

    D. Qi, X. Chen, W. Liu, C. Liu, W. Liu, K. Wang and J. Jiang, Inorg. Chem. Front., 2020, Advance Article , DOI: 10.1039/C9QI01325C

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