A Defective PtCoO2 2D Conductor with Resistivity Lower than Pt: Design of Molten Salt Synthesis

IF 4.7 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Inorganic Chemistry Pub Date : 2025-09-22 DOI:10.1021/acs.inorgchem.5c01896

Lisa John, Sajal Ghosh, Nair Afijith Ravindranath, Sudip Ghosh, Somasundaram Murugesan, Ethirajulu Prabhu, Athinarayanan Sundaresan, Venkataraman Jayaraman, Kovilpillai Immanuel Gnanasekar

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Abstract

Highly defective 2D layered molten salt synthesized polycrystalline PtCoO₂ is metallic down to 1.8 K with a resistivity of 1.36 ± 0.05 μΩ·cm at 300 K, which is an order lower than that of Pt. The design of NaCl–CoCl₂ molten salt and its chemistry for obtaining phase-pure PtCoO₂ are presented. Dynamic changes in liquidus temperatures brought about by the compositional changes of NaCl–CoCl₂ upon consumption of CoCl₂ during the reaction are constrained to be within ±35 °C by a predesigned salt mixture. Rietveld structural refinements of XRD and SAED confirm the R3̅m space group with predominant (00l) texturing. XPS reveals that Co and Pt are predominantly in +3 and +1 oxidation states, respectively. PtCoO₂ is paramagnetic due to the low-spin Co⁴⁺, which undergoes antiferromagnetic ordering around 14 K. The catalytic property of PtCoO₂ is investigated for H₂ sensing.

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电阻率低于Pt的缺陷PtCoO2二维导体：熔盐合成的设计

高缺陷二维层状熔盐合成的多晶PtCoO2在300 K时的电阻率为1.36±0.05 μΩ·cm，低于Pt的一个级。本文介绍了NaCl-CoCl2熔盐的设计及其制备相纯PtCoO2的化学过程。通过预先设计的盐混合物，将反应过程中消耗CoCl2时NaCl-CoCl2组分变化引起的液相温度动态变化限制在±35℃以内。XRD和SAED的Rietveld结构细化证实了以（00l）织构为主的R3 _ m空间群。XPS显示Co和Pt分别以+3和+1氧化态为主。PtCoO2是顺磁性的，这是由于低自旋的Co4+，它在14k左右经历反铁磁有序。研究了PtCoO2对H2传感的催化性能。

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来源期刊

Inorganic Chemistry 化学-无机化学与核化学

CiteScore

7.60

自引率

13.00%

发文量

1960

审稿时长

1.9 months

期刊介绍： Inorganic Chemistry publishes fundamental studies in all phases of inorganic chemistry. Coverage includes experimental and theoretical reports on quantitative studies of structure and thermodynamics, kinetics, mechanisms of inorganic reactions, bioinorganic chemistry, and relevant aspects of organometallic chemistry, solid-state phenomena, and chemical bonding theory. Emphasis is placed on the synthesis, structure, thermodynamics, reactivity, spectroscopy, and bonding properties of significant new and known compounds.