Electronic modulation of cobalt–molybdenum oxide via Te doping embedded in a carbon matrix for superior overall water splitting,Inorganic Chemistry Frontiers

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Electronic modulation of cobalt–molybdenum oxide via Te doping embedded in a carbon matrix for superior overall water splitting
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2022-05-27 , DOI: 10.1039/d2qi00753c
Luqi Wang ₁ , Hanzhi Yu ₁ , Sheng Zhao ₁ , Hui Ma ₂ , Linlin Li ₁ , Feng Hu ₁ , Lei Li ₂ , Hui Pan ₃ , K. M. El-Khatib ₄ , Shengjie Peng ₁

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Heteroatom incorporation into the lattice of host materials as bifunctional electrocatalysts is developed as an effective strategy to promote electrochemical water splitting but challenges remain in the modulation of catalytic activity. Herein, Te-doped CoMoO₃ supported on a carbon matrix (Te-CoMoO₃@C) is synthesized by lattice engineering with filter paper as a sacrificial carrier and carbon source. The doping of Te can effectively modulate the local electronic structures of Co and Mo sites and significantly boost the electrochemical active surface area and electron transfer, which optimize the reactivity of reaction intermediates with the electrocatalysts. Moreover, the filter paper-derived carbon as a carrier guarantees adequate exposure of the surface active sites and enhances catalytic stability. Impressively, the optimized Te-CoMoO₃@C only requires overpotentials of 76 and 215 mV at 10 mA cm⁻² for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER), respectively. As expected, Te-CoMoO₃@C exhibits a low cell voltage of 1.54 V at 10 mA cm⁻² for water splitting. This work gives new insights into the rational design of metal oxides and opens up a novel strategy toward preparing efficient bifunctional electrocatalysts.

中文翻译：

通过嵌入碳基体中的 Te 掺杂对钴-钼氧化物进行电子调制，以实现卓越的整体水分解

作为双功能电催化剂将杂原子结合到主体材料的晶格中被开发为促进电化学水分解的有效策略，但在调节催化活性方面仍然存在挑战。在此，Te-CoMoO ₃负载在碳基质上（Te-CoMoO ₃@C) 以滤纸为牺牲载体和碳源通过晶格工程合成。Te的掺杂可以有效调节Co和Mo位点的局部电子结构，显着提高电化学活性表面积和电子转移，从而优化反应中间体与电催化剂的反应性。此外，作为载体的滤纸衍生碳保证了表面活性位点的充分暴露并提高了催化稳定性。令人印象深刻的是，优化的 Te-CoMoO _{3 @C 在 10 mA cm}^-2下仅需要 76 和 215 mV的过电势，分别用于析氢反应 (HER) 和析氧反应 (OER)。正如所料，Te-CoMoO ₃^{@C 在 10 mA cm -2}下表现出 1.54 V 的低电池电压，用于水分解。这项工作为金属氧化物的合理设计提供了新的见解，并开辟了制备高效双功能电催化剂的新策略。

更新日期：2022-05-27

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