1
|
Nwambaekwe KC, Ramoroka ME, Yussuf ST, Morudu TC, Ndipingwi MM, Iwuoha EI. Tb- and Eu-doped yttrium oxyselenides as novel absorber layers for superstrate thin-film photovoltaics: improved spectral optical absorption and green-red phosphor activation. Nanoscale 2023; 15:17147-17172. [PMID: 37853791 DOI: 10.1039/d3nr01162c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2023]
Abstract
To generate and deliver alternative sustainable energy in the face of the current energy crisis, new materials that can capture solar energy and transform it into other useful energies are required. Rare-earth (RE) oxychalcogenides are now being used more frequently as up/down-conversion materials in established photovoltaic (PV) devices to boost their PV performance. Here, through an efficient microwave assisted synthesis procedure, novel nanoplate/sheet shaped nanomaterials of yttrium oxyselenide (YOSe) and its analogues doped with Tb and Eu (YOSe:Tb and YOSe:Eu) were successfully synthesized. Analyses of the structure, stability, morphology, light absorption, and electrochemistry were performed. This work showed that the parent YOSe exhibited green (543 nm) and red (615 nm) emission luminescence when doped with Tb and Eu with a luminescence quantum yield (LQY) of 0.56 and 0.53 for YOSe:Tb and YOSe:Eu nanomaterials, respectively. The surface and material conductivity of YOSe improved with the addition of the dopant elements, with the best outcome shown in YOSe:Eu, according to electrokinetic research evidenced by the enhanced current peaks, reduced charge-transfer resistance (Rct) and low impedance magnitude (Zmag) through electrochemical experiments. These improvements were induced by the distinctive properties of the dopant elements. PCEs of 0.25%, 0.67%, and 1.20% were obtained for YOSe, YOSe:Tb, and YOSe:Eu-based PV devices, respectively, using the nanomaterials as novel absorber layers in a superstrate device design. Our results can initiate further exploitation of the doped host structure for effective down-conversion NIR luminescence for applications in PV devices and to boost the PV performance of existing solar cells.
Collapse
Affiliation(s)
- Kelechi C Nwambaekwe
- Key Laboratory for NanoElectrochemistry, University of the Western Cape Sensor Laboratories (SensorLab), 4th Floor Chemical Sciences Building, University of the Western Cape, Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
| | - Morongwa E Ramoroka
- Key Laboratory for NanoElectrochemistry, University of the Western Cape Sensor Laboratories (SensorLab), 4th Floor Chemical Sciences Building, University of the Western Cape, Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
| | - Sodiq T Yussuf
- Key Laboratory for NanoElectrochemistry, University of the Western Cape Sensor Laboratories (SensorLab), 4th Floor Chemical Sciences Building, University of the Western Cape, Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
| | - Tshaamano C Morudu
- Key Laboratory for NanoElectrochemistry, University of the Western Cape Sensor Laboratories (SensorLab), 4th Floor Chemical Sciences Building, University of the Western Cape, Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
| | - Miranda M Ndipingwi
- Key Laboratory for NanoElectrochemistry, University of the Western Cape Sensor Laboratories (SensorLab), 4th Floor Chemical Sciences Building, University of the Western Cape, Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
| | - Emmanuel I Iwuoha
- Key Laboratory for NanoElectrochemistry, University of the Western Cape Sensor Laboratories (SensorLab), 4th Floor Chemical Sciences Building, University of the Western Cape, Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
| |
Collapse
|
2
|
Mabokela TE, Nwanya AC, Ndipingwi MM, Yussuf ST, Ekwere PI, Uhuo OV, Ikpo CO, Modibane KD, Iwuoha EI. Nanostructured Europium-Doped Layered Lithium Manganese Oxide as a Prospective Cathode Material for Aqueous Lithium-Ion Battery. Electrochim Acta 2023. [DOI: 10.1016/j.electacta.2023.141865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
|
3
|
Nolly C, Ikpo CO, Ndipingwi MM, Ekwere P, Iwuoha EI. Pseudocapacitive Effects of Multi-Walled Carbon Nanotubes-Functionalised Spinel Copper Manganese Oxide. Nanomaterials (Basel) 2022; 12:3514. [PMID: 36234643 PMCID: PMC9565235 DOI: 10.3390/nano12193514] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 09/26/2022] [Accepted: 09/29/2022] [Indexed: 06/16/2023]
Abstract
Spinel copper manganese oxide nanoparticles combined with acid-treated multi-walled carbon nanotubes (CuMn2O4/MWCNTs) were used in the development of electrodes for pseudocapacitor applications. The CuMn2O4/MWCNTs preparation involved initial synthesis of Mn3O4 and CuMn2O4 precursors followed by an energy efficient reflux growth method for the CuMn2O4/MWCNTs. The CuMn2O4/MWCNTs in a three-electrode cell assembly and in 3 M LiOH aqueous electrolyte exhibited a specific capacitance of 1652.91 F g-1 at 0.5 A g-1 current load. Similar investigation in 3 M KOH aqueous electrolyte delivered a specific capacitance of 653.41 F g-1 at 0.5 A g-1 current load. Stability studies showed that after 6000 cycles, the CuMn2O4/MWCNTs electrode exhibited a higher capacitance retention (88%) in LiOH than in KOH (64%). The higher capacitance retention and cycling stability with a Coulombic efficiency of 99.6% observed in the LiOH is an indication of a better charge storage behaviour in this electrolyte than in the KOH electrolyte with a Coulombic efficiency of 97.3%. This superior performance in the LiOH electrolyte than in the KOH electrolyte is attributed to an intercalation/de-intercalation mechanism which occurs more easily in the LiOH electrolyte than in the KOH electrolyte.
Collapse
|
4
|
Nwanya AC, Ndipingwi MM, Ezema FI, Iwuoha EI, Maaza M. Bio-synthesized P2-Na0.57CoO2 nanoparticles as cathode for aqueous sodium ion battery. J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2020.114600] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
|
5
|
Teffu DM, Makhafola MD, Ndipingwi MM, Makhado E, Hato MJ, Iwuoha EI, Modibane KD, Makgopa K. Interrogation of Electrochemical Performance of Reduced Graphene Oxide/Metal‐organic Framework Hybrid for Asymmetric Supercabattery Application. ELECTROANAL 2020. [DOI: 10.1002/elan.202060303] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Daniel M. Teffu
- Nanotechnology Research Lab Department of Chemistry School of Physical and Mineral Sciences University of Limpopo (Turfloop) Sovenga 0727 Polokwane South Africa
| | - Mogwasha D. Makhafola
- Nanotechnology Research Lab Department of Chemistry School of Physical and Mineral Sciences University of Limpopo (Turfloop) Sovenga 0727 Polokwane South Africa
| | - Miranda M. Ndipingwi
- SensorLab Chemistry Department University of the Western Cape Cape Town South Africa
| | - Edwin Makhado
- Nanotechnology Research Lab Department of Chemistry School of Physical and Mineral Sciences University of Limpopo (Turfloop) Sovenga 0727 Polokwane South Africa
| | - Mpitloane J. Hato
- Nanotechnology Research Lab Department of Chemistry School of Physical and Mineral Sciences University of Limpopo (Turfloop) Sovenga 0727 Polokwane South Africa
| | - Emmanuel I. Iwuoha
- SensorLab Chemistry Department University of the Western Cape Cape Town South Africa
| | - Kwena D. Modibane
- Nanotechnology Research Lab Department of Chemistry School of Physical and Mineral Sciences University of Limpopo (Turfloop) Sovenga 0727 Polokwane South Africa
| | - Katlego Makgopa
- Department of Chemistry Faculty of Science Tshwane University of Technology (Acardia Campus) Pretoria 0001 South Africa
| |
Collapse
|
6
|
Hlongwa NW, Ikpo CO, Ndipingwi MM, Nolly C, Raleie N, Dywili N, Iwuoha EI. Graphene‐functionalised Olivine Lithium Manganese Phosphate Derivatives for High Performance Lithium‐ion Capacitors. ELECTROANAL 2020. [DOI: 10.1002/elan.202060316] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ntuthuko W. Hlongwa
- SensorLab (University of the Western Cape Sensor Laboratories), Chemical Sciences Building Robert Sobukwe Road, Bellville 7535 Cape Town South Africa
| | - Chinwe O. Ikpo
- SensorLab (University of the Western Cape Sensor Laboratories), Chemical Sciences Building Robert Sobukwe Road, Bellville 7535 Cape Town South Africa
| | - Miranda M. Ndipingwi
- SensorLab (University of the Western Cape Sensor Laboratories), Chemical Sciences Building Robert Sobukwe Road, Bellville 7535 Cape Town South Africa
| | - Christopher Nolly
- SensorLab (University of the Western Cape Sensor Laboratories), Chemical Sciences Building Robert Sobukwe Road, Bellville 7535 Cape Town South Africa
| | - Naledi Raleie
- SensorLab (University of the Western Cape Sensor Laboratories), Chemical Sciences Building Robert Sobukwe Road, Bellville 7535 Cape Town South Africa
| | - Nomxolisi Dywili
- SensorLab (University of the Western Cape Sensor Laboratories), Chemical Sciences Building Robert Sobukwe Road, Bellville 7535 Cape Town South Africa
| | - Emmanuel I. Iwuoha
- SensorLab (University of the Western Cape Sensor Laboratories), Chemical Sciences Building Robert Sobukwe Road, Bellville 7535 Cape Town South Africa
| |
Collapse
|
7
|
Nwanya AC, Ndipingwi MM, Mayedwa N, Razanamahandry L, Ikpo CO, Waryo T, Ntwampe S, Malenga E, Fosso-Kankeu E, Ezema FI, Iwuoha EI, Maaza M. Maize (Zea mays L.) fresh husk mediated biosynthesis of copper oxides: Potentials for pseudo capacitive energy storage. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.01.186] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
8
|
Ndipingwi MM, Ikpo CO, Hlongwa NW, Dywili N, Djoumessi Yonkeu AL, Iwuoha EI. Crystal chemistry and lithium-ion intercalation properties of lithium manganese silicate cathode for aqueous rechargeable Li-ion batteries. J APPL ELECTROCHEM 2019. [DOI: 10.1007/s10800-019-01296-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|