The development of low-cost electrocatalysts with high performance toward the hydrogen evolution reaction (HER) is crucial for large-scale and clean hydrogen production. Herein, we report a facile synthesis of Co/CoO hybrids with oxygen vacancies on carbon cloth (CC) via the calcination treatment of a Co₃O₄ precursor in a reducing atmosphere (H₂/Ar). Moreover, to avoid delamination and cracks during heat treatment and catalyst abscission during the HER test, the precursor of Co(OH)₂ was stabilized on CC by the anion intercalation method, resulting in robust adhesion between the film and substrate. The as-prepared Co/CoO hybrids rooted on the CC substrate possessed good charge transfer properties, favorable kinetics, abundant active sites, and robust adhesion. A suitable reducing atmosphere was crucial for high catalytic activity. By optimizing, the sample obtained in a 30% H₂/Ar atmosphere (Co/CoO-30) possessed an optimal balance between Co/CoO and oxygen vacancies, exhibiting optimum HER performance with the smallest overpotential of 158 mV at 10 mA cm⁻² and Tafel slope of 68.1 mV dec⁻¹ as well as good stability, operating for at least 24 h.

中文翻译：

---

植根于碳布上的Co / CoO杂化物作为碱性溶液中氢释放反应的有效电催化剂

低成本，高性能的制氢反应催化剂的开发对于大规模和清洁制氢至关重要。在本文中，我们报告了通过在还原性气氛（H ₂ / Ar）中对Co ₃ O ₄前驱体进行煅烧处理，在碳布（CC）上轻松合成具有氧空位的Co / CoO杂化体。此外，为避免在热处理过程中分层和开裂以及在HER试验中催化剂脱落，Co（OH）₂的前体通过阴离子嵌入法将其稳定在CC上，从而在薄膜和基材之间产生牢固的粘合力。根植于CC基板上的Co / CoO杂化物具有良好的电荷转移性能，良好的动力学，丰富的活性位点和牢固的附着力。合适的还原气氛对于高催化活性至关重要。通过优化，在30％H中得到的样品₂ / Ar气氛中（CO / COO-30）所具有的Co / CoO和氧空位之间的最佳平衡，以10mA厘米表现出最佳HER具有最小超电势158毫伏的性能^{- 2}和68.1 mV dec ^-1的Tafel斜率以及良好的稳定性，可运行至少24 h。