Development of the nonprecious metal based catalysts for electrochemical hydrogen evolution reaction (HER) is of great industrial application in production of the clean energy carrier, hydrogen gas. In this work, Co₃O₄ catalysts with various morphologies were controllably fabricated via hydrothermal method by controlling the pH in precursors solutions and the particular Co₃O₄ catalyst obtained in the low pH range with ultrathin-sheet-aggregated-sphere structure performed catalytic output for HER. Then the Co₃O₄ catalysts were triggered into a higher active state with the equipment of Ag substrate. The overpotential at the HER current density of 10 mA cm⁻² was optimized into −0.296 V and this catalytic enhancement is attributed to the heterohybrid synergism of spillover effect as well as the enlarged electrochemical specific area. This study turns the HER-inert Co₃O₄ into active and further provides a practical strategy to equip the Ag substrate for further enhancement of hydrogen evolution.

用于电化学氢析出反应（HER）的非贵金属基催化剂的开发在清洁能源载体氢气的生产中具有重要的工业应用。在这项工作中，钴₃ ö _4种催化剂与各种形貌可控地通过水热法，通过控制前体溶液的pH和特定有限公司制造的₃ ö ₄在低pH值范围内得到的超薄片材聚集球结构催化剂进行催化HER的输出。然后用Ag底物的设备将Co ₃ O ₄催化剂激发成较高的活性态。HER电流密度为10 mA cm ^-2时的过电势被优化至−0.296 V，并且这种催化增强归因于溢出效应的杂种协同作用以及扩大的电化学比面积。这项研究将HER惰性的Co ₃ O ₄转化为活性物质，并进一步提供了一种实用的策略来装备Ag基质，以进一步增强氢的释放。