近日，云南师范大学能源与环境科学学院邓书康和杨培志教授在ZN-Co9S8催化材料研究方面取得了重要研究成果。

论文全文：

1-s2.0-S1385894721024992-main.pdf

成果亮点：

• 通过简便的方法合成了Zn调制的Co9S8。

• 引入氧空位可以激活Co9S8上的惰性氧化层。

• 调整 d 波段中心的位置以促进 OER 的快速动力学。

• 金属Co9S8催化剂可以加速电子转移过程。

• Zn-Co3O4 /Co9S8表现出优异的OER活性。

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Metallic cobalt-based sulfde, selenide and phosphide will undergo superfcial transformation into insuffcient activity cobalt oxides/(oxy)hydroxides during the oxygen evolution reaction (OER) process, which limits the effciencies of electrical-conversion applications. It is necessary to activate the inert oxidation layer on the surface of metallic compounds for highly effcient OER catalysts. Taking cobalt sulfde as an example, we designed a facile strategy to introduce oxygen vacancy (Vo) in the inert oxidation layer CoOx coating on metallic Co9S8 by in-situ derived Zn doped Co9S8. First-principles calculation and experimental analysis verify that introduced Vo leads to lesser electron flling of the anti-bonding states by tailoring the positions of d-band center, which can facilitate the fast kinetics of OER. Meanwhile, internal metallic Zn-Co9S8 can accelerate the electron transfer process. Benefting from the advantages of geometric construction and electronic regulation, fabricated Zn doped CoOx/Co9S8 nanotube arrays exhibit remarkable electrocatalytic activity with a low overpotential of ~
256 mV to achieve the current density of 10 mA cm- 2, Tafel slope drops as low as ~ 44 mV dec- 1, accompanied by good long term stability toward OER conditions. The present work provides valuable insights into the design of other catalysts for OER and beyond.

摘要：在析氧反应 (OER) 过程中，金属钴基硫化物、硒化物和磷化物将表面转化为活性不足的钴氧化物/（羟基）氢氧化物，这限制了电转换应用的效率。这就需要利用高效的OER催化剂，激活金属化合物表面的惰性氧化层。研究，以硫化钴为例，设计了一种简便的策略，通过原位衍生的Zn掺杂Co9S8，在金属Co9S8上的惰性氧化层CoOx涂层中引入氧空位Vo）. 并通过计算和实验分析证实，通过调整 d 带中心的位置，引入的 Vo 导致反键态的电子填充较少，促进 OER 的活性。同时，内部金属Zn-Co9S8可以加速电子转移过程。受益于几何结构和电子调控的优势，制备的Zn掺杂CoOx/Co9S8纳米管阵列表现出显著的电催化活性，在低于~256 mV的电压下实现10mAcm-2的电流密度，Tafel斜率下降低至 ~44 mVdec−1，且具有较好的稳定性。这为新型高效OER催化剂研究提供了新的思路。