富Zn0.76Co0.24S的ZnCo2S4/ZnCr2O4纳米结构催化电化学析氧,ACS Applied Nano Materials

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富Zn0.76Co0.24S的ZnCo2S4/ZnCr2O4纳米结构催化电化学析氧
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2024-01-10 , DOI: 10.1021/acsanm.3c05739
Shreelekha Barik ₁ , Rathindranath Biswas ₁ , Imtiaz Ahmed ₁ , Ayan Roy ₂ , Krishna Kanta Haldar ₁

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为析氧反应（OER）寻找昂贵且稀缺的贵金属电催化剂的合适替代品仍然是一项具有挑战性的任务。需要研究基于过渡金属的高效且持久的催化剂，这些催化剂在地球上很容易用于电化学析氧。在本研究中，通过水热处理金属盐前体和硫代乙酰胺，然后在 700 °C 下煅烧 ZnCr ₂ O4 来生成 ZnCo ₂ S ₄ /ZnCr ₂ O ₄复合纳米结构，从而获得硫化锌钴 (ZnCo 2 S _{4 )}_。富集Zn _0.76 Co _0.24 S。然后测试了富集Zn _0.76 Co _0.24 S的成分依赖性ZnCo ₂ S ₄ /ZnCr ₂ O ₄纳米结构及其成分的电化学性能，发现OER活性为与成分不成线性比例。我们还评估了中性介质中 pH 7.0 时的 OER 活性以及碱性介质中的 OER 电化学性能。Zn-Co-S 优于 Zn 基和 Cr 基硫代尖晶石，因为它可以提高电子电导率并降低电荷转移电阻。这两种特性对于在 OER 过程中产生高氧化价的 Co 物种是必要的。该材料独特的成分和卓越的稳定性使其非常适合该领域的未来研究。

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Electrochemical Oxygen Evolution Catalyzed by Zn0.76Co0.24S-Enriched ZnCo2S4/ZnCr2O4 Nanostructures

Finding a suitable replacement for expensive and scarce precious metal electrocatalysts for the oxygen evolution reaction (OER) remains a challenging task. There is a need to research highly efficient and long-lasting catalysts based on transition metals that are readily available on Earth for electrochemical oxygen evolution. In this study, zinc cobalt sulfide (ZnCo₂S₄) was derived by hydrothermal treatment of metal salt precursors and thioacetamide, followed by calcination at 700 °C for ZnCr₂O4 to create a ZnCo₂S₄/ZnCr₂O₄ composite nanostructure enriched with Zn_0.76Co_0.24S. The electrochemical performance of the composition-dependent ZnCo₂S₄/ZnCr₂O₄ nanostructure enriched with Zn_0.76Co_0.24S was then tested along with its constituents, and it was found that the OER activity is not linearly proportional to the composition. We also evaluated the OER activity at pH 7.0 in a neutral medium and the OER electrochemical performance in an alkaline medium. Zn–Co–S is preferable to Zn- and Cr-based thio-spinel as it increases electronic conductivity and decreases charge transfer resistance. Both of these properties are necessary for generating the high oxidative valency of Co species during the OER process. The material’s unique composition and remarkable stability make it highly desirable for future research in this field.

更新日期：2024-01-10

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