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Lu Z, Yang H, Liu Q, Luo J, Feng L, Chu L, Liu X. Nb 2 AlC MAX Nanosheets Supported Ru Nanocrystals as Efficient Catalysts for Boosting pH-Universal Hydrogen Production. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023:e2305434. [PMID: 38126941 DOI: 10.1002/smll.202305434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 11/15/2023] [Indexed: 12/23/2023]
Abstract
MAX phase combines both ceramic and metallic properties, which exhibits widespread application prospects. 2D MAX nanosheets have more abundant surface-active sites, being anticipated to improve the performance of surface-related applications. Herein, for the first time, 2D Nb2 AlC nanosheets (NSs) as novel supports anchored with Ru catalysts for overall water splitting are developed. The optimized catalyst of Ru@Nb2 AlC NSs exhibit Pt-comparable kinetics and superior catalytic activity toward hydrogen evolution reaction (HER) (low overpotentials of 61 and 169 mV at 10 and 100 mA cm-2 , respectively) with excellent durability (5000 cycles or 80 h) in alkaline media. In particular, Ru@Nb2 AlC NSs achieve a mass activity of ≈4.8 times larger than the commercial Pt/C (20 wt.%) catalyst. The post-oxidation resultant catalyst of RuO2 @Nb2 AlC NSs also exhibit boosting HER and oxygen evolution reaction activities and ≈100% Faraday efficiency for overall water splitting with a cell voltage of 1.61 V to achieve 10 mA cm-2 . Therefore, the novel category of 2D MAX supports anchored with Ru nanocrystals offers a novel strategy for designing a wide range of MAX-supported metal catalysts for the renewable energy field.
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Affiliation(s)
- Zhensui Lu
- Key Laboratory of Display Materials and Photoelectric Devices (Ministry of Education), Tianjin Key Laboratory for optoelectronic Materials and Devices, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China
| | - Hui Yang
- Key Laboratory of Display Materials and Photoelectric Devices (Ministry of Education), Tianjin Key Laboratory for optoelectronic Materials and Devices, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China
| | - Qian Liu
- Institute for Advanced Study, Chengdu University, Chengdu, Sichuan, 610106, China
| | - Jun Luo
- Key Laboratory of Display Materials and Photoelectric Devices (Ministry of Education), Tianjin Key Laboratory for optoelectronic Materials and Devices, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China
- ShenSi Lab, Shenzhen Institute for Advanced Study, University of Electronic Science and Technology of China, Longhua District, Shenzhen, 518110, China
| | - Ligang Feng
- Institute of Carbon Neutrality and New Energy, School of Electronics and Information, Hangzhou Dianzi University, Hangzhou, 310018, China
| | - Liang Chu
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, China
| | - Xijun Liu
- State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, School of Resources, Environment and Materials, Guangxi University, Nanning, Guangxi, 530004, China
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Silva MNT, Alves DAC, Richter EM, Munoz RAA, Nossol E. A simple, fast, portable and selective system using carbon nanotubes films and a 3D-printed device for monitoring hydroxychloroquine in environmental samples. Talanta 2023; 265:124810. [PMID: 37364384 DOI: 10.1016/j.talanta.2023.124810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 06/06/2023] [Accepted: 06/09/2023] [Indexed: 06/28/2023]
Abstract
In this work, an electrochemical method was developed for rapid and sensitive detection of hydroxychloroquine (HCQ), an ineffective candidate drug for COVID-19 treatment however widely consumed during the pandemic, in aqueous samples using a multi-walled carbon nanotubes (MWCNT) film produced through the interfacial method on the indium tin oxide electrode (ITO). According to Raman spectroscopy, X-ray diffraction, UV-vis spectroscopy, Energy-dispersive X-ray spectroscopy, scanning electron microscopy, and atomic force microscopy, the interfacial method produces homogeneous thin films of carbon nanotubes on the substrate surface, which keep connected to the surface forming a three-dimensional microporous structure. The electrochemical behavior and oxidation kinetics of HCQ were also investigated in the MWCNT film. The sensor showed a 7 times higher oxidation current for (69.88 μA) for HCQ than the ITO electrode (9.33 μA) due to the electrocatalytic properties MWCNTs. The ITO-modified electrode was assembled on a portable 3D-printed batch-injection cell for the amperometric detection of HCQ. The oxidation peak current of HCQ is linearly proportional to the concentrations of HCQ ranging from 1.0 to 100.0 μmol L-1, with a limit of detection of 0.27 μmol L-1. Water samples (river and tap water) were spiked with HCQ, without the need for dispendious pretreatment (except filtration), and analyzed by the portable system, revealing the detection of HCQ with the recovery of 92.0%-99.8%, which suggested the great potential for real environmental monitoring application.
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Affiliation(s)
- Murillo N T Silva
- Federal University of Uberlândia, Institute of Chemistry, 38400-902, Uberlândia, MG, Brazil
| | - Diego A C Alves
- Faculty of Mechanical Engineering, Federal University of Uberlândia, 38400-902, Uberlândia, Minas Gerais, Brazil
| | - Eduardo M Richter
- Federal University of Uberlândia, Institute of Chemistry, 38400-902, Uberlândia, MG, Brazil
| | - Rodrigo A A Munoz
- Federal University of Uberlândia, Institute of Chemistry, 38400-902, Uberlândia, MG, Brazil
| | - Edson Nossol
- Federal University of Uberlândia, Institute of Chemistry, 38400-902, Uberlândia, MG, Brazil.
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Borges PH, Narciso LC, Miguel GFDS, de Oliveira GS, Junior MC, Machado AEDH, Muñoz RA, Nossol E. An experimental and theoretical approach to electrochemical sensing of hydrazine at silver and copper hexacyanoferrates electrodes. Electrochim Acta 2023. [DOI: 10.1016/j.electacta.2023.142018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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Guimarães F. Júnior J, Roberto Barbosa de Lima A, John Duarte de Freitas A, Duarte de Freitas J, Rodrigues Limad P, Caxico de Abreu F, Meneses D. Paper based device (PAD) for colorimetric determination of ranitidine in Pharmaceutical Samples. Microchem J 2022. [DOI: 10.1016/j.microc.2022.107336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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