期刊
ADVANCED ENERGY MATERIALS
卷 11, 期 42, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202102134
关键词
heterojunctions; hydrogen evolution reaction; oxygen evolution reaction; water splitting
类别
资金
- National Natural Science Foundation of China [52071084, 51871060, 51922031, 52071083, 51831009]
- Shanghai Education Development Foundation
- Shanghai Municipal Education Commission [20SG03]
- Science & Technology Commission of Shanghai Municipality [20XD1420600]
- National Key R&D Program of China [2020YFA0406204]
- Zhuhai Fudan Innovation Institute
Designing a composite electrocatalyst with Co/CoP heterojunction embedded within a hierarchically ordered carbon matrix resulted in significantly enhanced catalytic activity due to optimized active site exposure and proton transfer facilitation. The Co/CoP@HOMC composites exhibited outstanding performance in hydrogen and oxygen evolution reactions, surpassing the performance of traditional Pt-based catalysts in an alkaline electrolyzer.
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).
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