High performance CaAl12O19:Ho3+ phosphors for energy and environmental sustainability: Synergizing photoluminescence, electrochemical energy storage and photocatalysis

IF 5.5 3区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of the Taiwan Institute of Chemical Engineers Pub Date : 2025-06-26 DOI:10.1016/j.jtice.2025.106238

T.N. Megharaj , B R Radha Krushna , N. Navya , S.C. Sharma , B. Bommalingaiah , Pusparaj Samantsinghar , K. Manjunatha , Sheng Yun Wu , Shih-Lung Yu , U. Premkumar , G. Ramakrishna , H. Nagabhushana

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Abstract

Background

A series of un-doped and 1–9 mol % Ho³⁺ doped CaAl₁₂O₁₉ (CAO: Ho³⁺) phosphors are synthesized and characterized to explore their structural, optical, electrochemical, and photocatalytic properties. Understanding these characteristics is crucial for applications in energy storage and environmental remediation.

Methods

The synthesized phosphors are analyzed using X-ray diffraction (XRD), energy-dispersive X-ray analysis (EDAX), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). X-ray photoelectron spectroscopy (XPS) confirmed the elemental composition and oxidation states. Optical properties are evaluated using UV–Vis spectroscopy for bandgap determination, while photoluminescence (PL) analysis identified Ho³⁺ emission peaks. Electrochemical studies assessed the supercapacitor performance, and photocatalytic efficiency is tested through methylene blue (MB) dye degradation under visible light.

Significant Findings

The optimal Ho³⁺ concentration for peak photoluminescence is 5 mol %, with higher concentrations causing quenching. CAO:9Ho³⁺ exhibited a high specific capacitance (C_sp) of 792.87 F/g at 5 mV/s, excellent energy density (E_D) 14.126 Wh/kg at 1 A/g and retained 91.95 % capacitance after 5000 cycles. It also showed outstanding photocatalytic activity, degrading 91.79 % of MB dye in 100 min under visible light. These findings highlight its potential for high-performance supercapacitors and environmental applications, paving the way for sustainable innovations in energy storage and wastewater treatment technologies.

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用于能源和环境可持续性的高性能CaAl12O19:Ho3+荧光粉：协同光致发光、电化学储能和光催化

合成了一系列未掺杂和1-9 mol % Ho³+掺杂的CaAl12O19 （CAO: Ho3+）荧光粉，并对其进行了表征，以探索其结构、光学、电化学和光催化性能。了解这些特性对于储能和环境修复的应用至关重要。方法采用x射线衍射（XRD）、能量色散x射线分析（EDAX）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对合成的荧光粉进行分析。x射线光电子能谱（XPS）证实了元素组成和氧化态。光学性质用紫外可见光谱法测定带隙，而光致发光（PL）分析鉴定了Ho³⁺的发射峰。电化学研究评估了超级电容器的性能，并通过可见光下亚甲基蓝（MB）染料降解测试了光催化效率。Ho³⁺的最佳光致发光浓度为5 mol %，较高的浓度会导致猝灭。CAO:9Ho³⁺在5 mV/s时具有792.87 F/g的高比电容（Csp），在1 a /g时具有14.126 Wh/kg的优异能量密度（ED），在5000次循环后保持91.95%的电容。在可见光下，100 min内对MB染料的降解率为91.79%。这些发现突出了它在高性能超级电容器和环境应用方面的潜力，为能源储存和废水处理技术的可持续创新铺平了道路。

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来源期刊

Journal of the Taiwan Institute of Chemical Engineers 工程技术-工程：化工

CiteScore

9.10

自引率

14.00%

发文量

362

审稿时长

35 days

期刊介绍： Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.