Designing catalytic materials with enhanced stability and activity is crucial for sustainable electrochemical energy technologies. RuO₂ is the most active material for oxygen evolution reaction (OER) in electrolysers aiming at producing ‘green’ hydrogen, however it encounters critical electrochemical oxidation and dissolution issues during reaction. It remains a grand challenge to achieve stable and active RuO₂ electrocatalyst as the current strategies usually enhance one of the two properties at the expense of the other. Here, we report breaking the stability and activity limits of RuO₂ in neutral and alkaline environments by constructing a RuO₂/CoO_x interface. We demonstrate that RuO₂ can be greatly stabilized on the CoO_x substrate to exceed the Pourbaix stability limit of bulk RuO₂. This is realized by the preferential oxidation of CoO_x during OER and the electron gain of RuO₂ through the interface. Besides, a highly active Ru/Co dual-atom site can be generated around the RuO₂/CoO_x interface to synergistically adsorb the oxygen intermediates, leading to a favourable reaction path. The as-designed RuO₂/CoO_x catalyst provides an avenue to achieve stable and active materials for sustainable electrochemical energy technologies.

设计具有增强稳定性和活性的催化材料对于可持续电化学能源技术至关重要。 RuO ₂是电解槽中析氧反应（OER）最活跃的材料，旨在生产“绿色”氢气，但它在反应过程中遇到了关键的电化学氧化和溶解问题。实现稳定且活性的RuO ₂电催化剂仍然是一个巨大的挑战，因为当前的策略通常以牺牲另一种性能为代价来增强两种性能中的一种。在这里，我们报告通过构建RuO ₂ /CoO _x界面打破了RuO ₂在中性和碱性环境中的稳定性和活性限制。我们证明RuO ₂可以在CoO _x基底上高度稳定，超过块状RuO ₂的普贝稳定性极限。这是通过OER过程中CoO _x的优先氧化以及RuO ₂通过界面的电子增益来实现的。此外，RuO ₂ /CoO _x界面周围可以产生高活性的Ru/Co双原子位点，协同吸附氧中间体，形成有利的反应路径。设计的RuO ₂ /CoO _x催化剂为实现可持续电化学能源技术的稳定和活性材料提供了途径。