This study aims to develop an effective and inexpensive oxygen evolution reaction (OER) electrocatalysts for efficient water splitting. Cu₂O nanoparticles coated with carbon (Cu₂O@C) were successfully synthesized by photocatalytic method. As a novel non-noble-metal OER catalyst, the Cu₂O@C exhibited excellent OER efficiency with an onset overpotential of 250mV and a Tafel slope of 63mVdecade⁻¹. This catalyst maintained its catalytic activity for at least 100h and required only an overpotential of 330mV to attain a current density 10mAcm⁻² _GEO. During OER catalysis, the carbon shell served as a conducting media to quicken the charge transfer and as a protective layer to enhance the phase stability and prevent the aggregation of Cu₂O nanoparticles.

中文翻译：

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Cu2O @ C核/壳纳米粒子作为氧析出反应的电催化剂

这项研究旨在开发一种有效且廉价的制氧反应（OER）电催化剂，以实现高效的水分解。通过光催化方法成功合成了包覆有碳的Cu ₂ O纳米粒子（Cu ₂ O @ C）。作为一种新型的非贵金属OER催化剂，Cu ₂ O @ C表现出优异的OER效率，起始过电势为250mV，Tafel斜率为63mVdecade ^-1。该催化剂保持其催化活性至少100h，仅需330mV的超电势即可达到10mAcm ^-2 _GEO的电流密度。在OER催化过程中，碳壳充当导电介质以加快电荷转移，并充当保护层以增强相稳定性并防止Cu ₂ O纳米粒子聚集。