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Co/CoP Heterojunction on Hierarchically Ordered Porous Carbon as a Highly Efficient Electrocatalyst for Hydrogen and Oxygen Evolution
Designing non‐precious electrocatalysts to synergistically achieve a facilitated mass/electron transfer and exposure of abundant active sites is highly desired but remains a significant challenge. Herein, a composite electrocatalyst consisting of highly dispersed Co/CoP heterojunction embedded withi...
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Published in: | Advanced energy materials 2021-11, Vol.11 (42), p.n/a |
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Main Authors: | , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Designing non‐precious electrocatalysts to synergistically achieve a facilitated mass/electron transfer and exposure of abundant active sites is highly desired but remains a significant challenge. Herein, a composite electrocatalyst consisting of highly dispersed Co/CoP heterojunction embedded within a hierarchically ordered macroporous‐mesoporous‐microporous carbon matrix (Co/CoP@HOMC) is rationally designed through the pyrolysis of polystyrene sphere‐templated zeolite imidazolate framework‐67 (ZIF‐67) assemblies. The combined experimental and theoretical calculations reveal that Co/CoP interfaces not only provide richly exposed active sites but also optimize hydrogen/water absorption free energy via electronic coupling, while the interconnected macroporous structure enables a superior mass transfer to all accessible active sites. As a result, the as‐developed Co/CoP@HOMC composites exhibit outstanding catalytic activity with overpotentials of only 120 and 260 mV at 10 mA cm−2 for the hydrogen evolution reaction and oxygen evolution reaction in 1.0 m KOH, respectively. Moreover, an alkaline electrolyzer constructed by Co/CoP@HOMC requires an ultralow cell voltage of 1.54 V to achieve 10 mA cm−2, outperforming that of the Pt@C||IrO2@C couple (1.64 V).
Hierarchically ordered porous carbon‐supported heterostructured Co/CoP nanoparticles (Co/CoP@HOMC) are rationally designed. Owing to the synergistic coupling effect, highly exposed active sites, and enhanced mass transfer, the Co/CoP@HOMC exhibits an exceptional catalytic activity for both the hydrogen evolution reaction and the oxygen evolution reaction. |
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ISSN: | 1614-6832 1614-6840 |
DOI: | 10.1002/aenm.202102134 |