在性介质中评估体制备的PtSe2和PtTe2催化剂的进化反应活性
Lineo F Mxakaza1,2, Victor Mashindi1, Cebisa E Linganiso1,2
1Molecular Science Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, Wits, 2050, South Africa.
ChemistryOpen
|July 23, 2024
概括
telluride (PtTe2) 和 selenide (PtSe2) 用性气演化反应的体方法合成. 与PtSe2相比,PtTe2表现出更高的催化活性和动力学,尽管稳定性需要进一步增强.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 性进化反应 (HER) 由于水解离步骤而具有挑战性,与酸性 HER 不同.
- 过渡金属二甲基化物 (TMDs),特别是二甲基化物 (PtX2),提供基于素 (X=S,Se,Te) 的可调节电子特性.
- 之前用于PtX2的合成方法限制了可扩展性和用于电催化剂应用的合成后处理.
研究的目的:
- 为了研究不同的石化原子对二原化物 (PtX2) 的性HER活性的影响.
- 为潜在的电催化剂应用开发PtSe2和PtTe2的可扩展合成方法.
- 在性电解质中比较PtTe2和PtSe2的HER性能.
主要方法:
- 结合体合成首次用于制备PtSe2和PtTe2.2.
- 在1M KOH中,电化学评估PtSe2和PtTe2作为HER的电催化剂.
- 使用超电位测量和Tafel斜率测定的催化活性分析.
主要成果:
- 与 PtSe2 相比,PtTe2 在性介质中表现出更高的 HER 催化活性.
- 对于电流密度为-10 mA cm-2所需的超电位为PtTe2的108 mV和PtSe2.2的161 mV.
- PtTe2表现出更快的HER动力学,具有79mV dec-1的低Tafel斜率.
结论:
- 体合成使电化学应用的大规模生产PtSe2和PtTe2成为可能.
- PtTe2是性HER的有希望的电催化剂,在活性和动力学方面表现优于PtSe2.
- 在性介质中进一步改善催化剂稳定性是实际应用所必需的.
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