The optimization of intermediate adsorption is pivotal for enhancing the efficacy of catalysts in oxygen evolution reaction (OER). However, many Co-based catalysts exhibit excessive binding energy toward intermediates, thereby restricting the desorption process. To address this issue, we utilized the Co-based vanadates (CoV) as a model and observed that the incorporation of Fe can effectively mitigate the substantial accumulation of intermediates around the catalysts, achieving a balance between the adsorption and desorption. It can be attributed to the Fe-doping, which modulated the electronic structure of CoV, subsequently increasing the catalytic sites and intrinsic activity. As a result, the CoV-Fe exhibited a low overpotential of 260 mV at 20 mA cm, which decreased by 82 mV compared to pristine CoV. Besides, the electrolyzer based on CoV-Fe maintained a low cell of 1.46 V for water splitting and held a considerable attenuation of 4.49 % after 200 h of long-term operation.

中文翻译：

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评估铁掺杂对钴基钒酸盐从水电解中分离氢的中间吸附调节的影响

中间体吸附的优化对于提高催化剂在氧析出反应 (OER) 中的效率至关重要。然而，许多钴基催化剂对中间体的结合能过高，从而限制了解吸过程。为了解决这个问题，我们利用钴基钒酸盐 (CoV) 作为模型，观察到 Fe 的加入可以有效缓解催化剂周围中间体的大量积累，实现吸附和解吸之间的平衡。这可以归因于 Fe 掺杂，它调节了 CoV 的电子结构，从而增加了催化位点和固有活性。结果，CoV-Fe 在 20 mA cm 时表现出 260 mV 的低过电位，与原始 CoV 相比降低了 82 mV。此外，基于 CoV-Fe 的电解槽在水分解时保持 1.46 V 的低电池电压，并且在长期运行 200 小时后保持 4.49% 的显着衰减。