CuCoO2 nanocrystals derived from an isopropanol-modified Cu-BTC using alkaline water oxidation,New Journal of Chemistry

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CuCoO2 nanocrystals derived from an isopropanol-modified Cu-BTC using alkaline water oxidation
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2023-02-10 , DOI: 10.1039/d3nj00059a
Shiyu Ma _{1,

2} , Miao Yang ₂ , Na Han ₁ , Lifen Shi ₁ , Liang Wang ₂ , Jilin Bai ₂ , Dehua Xiong _{1,

2}

Affiliation

In this study, CuCoO₂ (CCO) nanocrystals were derived from the Cu-BTC/Cu-BTC-IPA precursors using the solvothermal method at 140 °C, and the electrocatalytic oxygen evolution reaction (OER) application of CCO catalysts was investigated. First, the optimized Cu-BTC-IPA precursor was prepared through a hydrothermal reaction at 120 °C with 9 mL isopropyl alcohol (IPA) addition. IPA species can affect the morphology and composition of CCO nanocrystals by tailoring the structure of bare Cu-BTC, resulting in Cu-BTC-IPA-derived CCO2 nanocrystals that have a smaller grain size of 110 nm and a larger specific surface area of 9.78 m² g⁻¹, which is compared to that of Cu-BTC-derived CCO1 nanocrystals. Second, the Ni@CCO2 electrode required an overpotential of 467 mV to reach 10 mA cm⁻², which is much lower than that of the Ni@CCO1 electrode (i.e., 493 mV). The Ni@CCO2 electrode also exhibits a small overpotential degradation of only 20 mV after an 18 hour OER stability test. The measurement results confirmed that the CCO2 catalyst has excellent stability in structure and composition during long-term OER electrolysis. This study reveals the preparation method of a CCO electrocatalyst by tailoring the organic ligands of MOF precursors, supplying a new approach for the preparation of delafossite oxide CCO and the enhancement of their OER performances.

中文翻译：

使用碱性水氧化从异丙醇改性的 Cu-BTC 衍生的 CuCoO2 纳米晶体

在这项研究中，CuCoO ₂ (CCO) 纳米晶体是在 140 °C 下使用溶剂热法从 Cu-BTC/Cu-BTC-IPA 前驱体衍生而来的，并研究了 CCO 催化剂在电催化析氧反应 (OER) 中的应用。首先，通过在 120 °C 下加入 9 mL 异丙醇 (IPA) 进行水热反应制备优化的 Cu-BTC-IPA 前体。IPA 物种可以通过调整裸 Cu-BTC 的结构来影响 CCO 纳米晶体的形态和组成，从而导致 Cu-BTC-IPA 衍生的 CCO2 纳米晶体具有更小的晶粒尺寸 110 nm 和更大的比表面积 9.78 m ²克^-1，与 Cu-BTC 衍生的 CCO1 纳米晶体相比。其次，Ni@CCO2 电极需要 467 mV 的过电位才能达到 10 mA cm ^-2，这远低于 Ni@CCO1 电极的过电位（即493 mV）。在 18 小时的 OER 稳定性测试后，Ni@CCO2 电极也表现出仅 20 mV 的小的过电位衰减。测量结果证实，CCO2催化剂在长期OER电解过程中具有优异的结构和组成稳定性。本研究揭示了通过定制 MOF 前驱体的有机配体制备 CCO 电催化剂的方法，为铜铁矿氧化物 CCO 的制备和提高其 OER 性能提供了一种新途径。

更新日期：2023-02-10

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