State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, P. R. China.
Department of Materials Science, Fudan University, Shanghai 200433, P. R. China.
Dalton Trans. 2023 Jun 13;52(23):7906-7916. doi: 10.1039/d3dt01179h.
The key step for hydrogen production through water electrolysis is the development of highly efficient and inexpensive oxygen evolution reaction (OER) catalysts. In this work, we report the successful synthesis of a nanostructured Fe-doped cobalt-based telluride (Fe-doped CoTe) catalyst on Co foam by a simple one-step hydrothermal synthesis method, which shows excellent OER performance. The influences of Fe doping amounts and reaction temperatures on the morphology, structure, composition, and the OER performance of cobalt-based tellurides have been systematically studied. The optimal sample Co@0.3 g FeCoTe-200 exhibits a low overpotential of 300 mV at a current density of 10 mA cm, and a small Tafel slope of 36.99 mV dec, outperforming the undoped cobalt telluride catalysts (Co@CoTe-200). The Co@0.3 g FeCoTe-200 electrode also reveals a small overpotential degradation of around 26 mV after an 18-hour continuous OER process. These results unambiguously confirm that Fe doping helps improve the OER activity and long-term catalytic stability. The superior performance of nanostructured Fe-doped CoTe can be attributed to the porous structure and the synergistic effect of Co and Fe elements. This study provides a new approach for the preparation of bimetallic telluride catalysts with enhanced OER performance, and Fe-doped CoTe holds substantial promise for use as a high-efficiency, cost-effective catalyst for alkaline water electrolysis.
通过水电解生产氢气的关键步骤是开发高效且廉价的氧析出反应（OER）催化剂。在这项工作中，我们通过简单的一步水热合成法成功地在 Co 泡沫上合成了一种纳米结构的 Fe 掺杂钴碲化物（Fe 掺杂 CoTe）催化剂，该催化剂表现出优异的 OER 性能。系统研究了 Fe 掺杂量和反应温度对钴基碲化物的形貌、结构、组成和 OER 性能的影响。最佳的样品 Co@0.3 g FeCoTe-200 在 10 mA cm 的电流密度下表现出 300 mV 的低过电位，并且 Tafel 斜率为 36.99 mV dec，优于未掺杂的钴碲化物催化剂（Co@CoTe-200）。Co@0.3 g FeCoTe-200 电极在 18 小时的连续 OER 过程后也仅表现出约 26 mV 的过电位降解。这些结果明确证实了 Fe 掺杂有助于提高 OER 活性和长期催化稳定性。纳米结构的 Fe 掺杂 CoTe 的优异性能可归因于多孔结构和 Co 和 Fe 元素的协同效应。这项研究为制备具有增强 OER 性能的双金属碲化物催化剂提供了一种新方法，Fe 掺杂 CoTe 有望成为高效、经济实惠的碱性水电解催化剂。
