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Browsing by Author "Ren, Jianwei"

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Atomic platinum layer coated titanium copper nitride supported on carbon nanotubes for the methanol oxidation reaction

Author: Zheng, Y ; Zhan, H ; Tang, H ; Luo, J ; Dang, D ; Shu, T ; Ren, Jianwei ; Tian, X ; Liao, S Date: Sep 2017 In this study, a novel low-Pt core-shell catalyst is successfully prepared by depositing ultrathin Pt layer on the carbon nanotubes supported titanium nitride nanoparticles (TiN@Pt/CNTs) via a facile pulse electrochemical deposition approach. ... Read more
Compaction of a zirconium metal–organic framework (UiO-66) for high density hydrogen storage applications

Author: Bambalaza, Sonwabo E ; Langmi, Henrietta W ; Mokaya, R ; Musyoka, Nicholas M ; Ren, Jianwei ; Khotseng, LE Date: Nov 2018 We report a rare case whereby a metal–organic framework (MOF), namely UiO-66, is compacted at high pressure (700 MPa or 100 000 psi) resulting in densification and improved total volumetric hydrogen storage capacity, but crucially, without ... Read more
A comparison of hydrogen storage capacity of commercial and fly ash-derived zeolite X together with their respective templated carbon derivatives

Author: Musyoka, Nicholas M ; Ren, Jianwei ; Langmi, Henrietta W ; North, Brian C ; Mathe, Mahlanyane K Date: Oct 2015 This paper presents comparative results of structural, morphological and hydrogen sorption properties between commercial and fly ash-derived zeolite X including their respective templated carbon derivatives. The surface area of commercial ... Read more
Comparison of MOF-5- and Cr-MOF-derived carbons for hydrogen storage application

Author: Segakweng, T ; Musyoka, Nicholas M ; Ren, Jianwei ; Crouse, P ; Langmi, Henrietta W Date: Nov 2015 Nanoporous carbons which possess high surface areas and narrow pore size distributions have become one of the most important classes of porous materials with potential to be utilized for hydrogen storage. In recent times, several metal–organic ... Read more
Current research trends and perspectives on materials-based hydrogen storage solutions: A critical review

Author: Ren, Jianwei ; Musyoka, Nicholas M ; Langmi, Henrietta W ; Mathe, Mahlanyane K ; Liao, S Date: Jan 2016 Effective hydrogen storage solutions have been pursued for decades, and materials-based hydrogen storage is a research frontier of much current interest. Yet, no researched materials to date have come close to the DOE 2020 targets for hydrogen ... Read more
Development of functional metal-organic frameworks (MOFs) for storing hydrogen in para form

Author: Ren, Jianwei ; Dyosiba, Xoliswa L ; Musyoka, Nicholas M ; Langmi, Henrietta W ; Mathe, Mahlanyane K Date: Dec 2016 In this work, enrichment of para-hydrogen is performed by flowing ultra-purity hydrogen gas at low temperature (77K) in the presence of a developed catalyst anchored in a MOF hybrid material. This approach fits within the bigger scope of the ... Read more
Effect of inclusion of MOF-polymer composite onto a carbon foam material for hydrogen storage application

Author: Molefe, Lerato Y ; Musyoka, Nicholas M ; Ren, Jianwei ; Langmi, Henrietta W ; Mathe, Mahlanyane K ; Ndungu, PG Date: Aug 2020 Despite the extensive studies done on the remarkable characteristics of metal–organic frameworks (MOFs) for gas storage applications, several issues still preclude their widespread commercial lightweight applications. In most cases, MOF ... Read more
Electrospun MOF nanofibers as hydrogen storage media

Author: Ren, Jianwei ; Musyoka, Nicholas M ; Annamalai, P ; Langmi, Henrietta W ; North, Brian C ; Mathe, Mahlanyane K Date: Jun 2015 In this study, Zr-MOF and Cr-MOF were chosen as representatives of the developed MOFs in our laboratory and were incorporated into electrospun nanofibers. The obtained MOF nanofibers composites were evaluated as hydrogen storage media. The ... Read more
Electrospun zeolite-templated carbon composite fibres for hydrogen storage applications

Author: Annamalai, Perushini ; Musyoka, Nicholas M ; Ren, Jianwei ; Langmi, Henrietta W ; Mathe, Mahlanyane K ; Bessarabov, D ; Petrik, LF Date: Jan 2017 The current study explored the application of the electrospinning technique to produce multi-hierarchical composites for hydrogen storage applications. Predetermined control of fibre porosity is expected to enable production of well-defined ... Read more
Enhanced cyclability of Li-O2 batteries with cathodes of Ir and MnO2 supported on well-defined

Author: Leng, L ; Li, J ; Zeng, X ; Tian, X ; Song, H ; Cui, Z ; Shu, T ; Wang, H ; Ren, Jianwei ; Liao, S Date: Feb 2018 The cycling stability of Li–O2 batteries has been impeded by the lack of high-efficiency, and durable oxygen cathodes for the oxygen-reduction reaction (ORR) and the oxygen-evolution reaction (OER). Herein we report a novel TiN nanorod ... Read more
Enhanced low-humidity performance in a proton exchange membrane fuel cell by developing a novel hydrophilic gas diffusion layer

Author: Hou, S ; Ye, Y ; Liao, S ; Ren, Jianwei ; Wang, H ; Yang, P ; Du, K ; Li, J ; Peng, H Date: Jan 2020 An ultrathin layer of hydrophilic titanium dioxide (TiO2) is coated on the gas diffusion layer (GDL) to enhance the performance of a proton exchange membrane fuel cell (PEMFC) at low relative humidity (RH) and high cell temperature. Both of ... Read more
Enhanced performance of LiNi0.03Mo0.01Mn1.96O4 cathode materials coated with biomass-derived carbon layer

Author: Zhang, M ; Chen, M ; Shao, Y ; Song, H ; Liu, L ; Ren, Jianwei ; Liao, S Date: Mar 2019 A high-performance Ni/Mo co-doped lithium manganate composite material, LiNi0.03Mo0.01Mn1.96O4, is prepared by a solidstate method, then a biomass-derived carbon layer with ethyl cellulose as the carbon source is applied to the surface of the ... Read more c b
Enhanced performance of proton exchange membrane fuel cell by introducing nitrogen-doped CNTs in both catalyst layer and gas diffusion layer

Author: Hou, S ; Chi, B ; Liu, G ; Ren, Jianwei ; Song, H ; Liao, S Date: Nov 2017 The performance of the proton exchange membrane fuel cell (PEMFC) is significantly improved through introducing nitrogen-doped carbon nanotubes (NCNTs) into the catalyst layer (CL) and microporous layer (MPL) of the membrane electrode assembly ... Read more
Enhancing membrane electrode assembly performance by improving the porous structure and hydrophobicity of the cathode catalyst layer

Author: Chi, B ; Ye, Y ; Lu, X ; Jiang, S ; Du, L ; Zeng, J ; Ren, Jianwei ; Liao, S Date: Dec 2019 Enhancing membrane electrode assembly (MEA) performance is an ongoing pursuit in the drive to meet the increasing demand for fuel cell technology. In the present study, we utilize carbon nanotubes (CNTs) as porosity enhancers and polytetraf ... Read more
Fabrication of core-shell MIL-101(Cr)@UiO-66(Zr) nanocrystals for hydrogen storage

Author: Ren, Jianwei ; Musyoka, Nicholas M ; Langmi, Henrietta W ; North, Brian C ; Mathe, Mahlanyane K ; Kang, X Date: Sep 2014 The fabrication of coreeshell nanocrystals by incorporating microporous UiO-66 into mesoporous MIL-101 is reported. The growth of the coreeshell MIL-101@UiO-66 nanocrystals was observed and supported by TEM and PXRD. The accessible pore volumes ... Read more
A facile segregation process and restoration of LiMn2 O4 cathode material from spent lithium-ion batteries

Author: Palaniyandy, Nithyadharseni ; Rambau, Khavharendwe MA ; Musyoka, Nicholas ; Ren, Jianwei Date: Apr 2020 Due to its three-dimensional tunnel structure, the spinel LiMn2[sub]O4[sub] (LMO) cathode material is highly favourable for the migration of lithium ions. Thus, LMO has been used as a commercial cathode material for the electronic devices ... Read more
A facile segregation process and restoration of LiMn2O4 cathode material from spent lithium-ion batteries

Author: Palaniyandy, Nithyadharseni ; Rambau, Khavharendwe MA ; Musyoka, Nicholas M ; Ren, Jianwei Date: Apr 2020 Due to its three-dimensional tunnel structure, the spinel LiMn2O4 (LMO) cathode material is highly favourable for the migration of lithium ions. Thus, LMO has been used as a commercial cathode material for the electronic devices such as mobile ... Read more
Feasibility of varied polyethylene terephthalate wastes as a linker source in metal-organic framework UiO-66(Zr) synthesis

Author: Dyosiba, Xoliswa L ; Musyoka, Nicholas M ; Langmi, Henrietta W ; Ren, Jianwei ; Mathe, Mahlanyane K ; Onyango, MS Date: Aug 2019 Polyethylene terephthalate (PET), a chemically stable polyester with multiple applications, has risen dramatically in manufacturing and consumption in the past decades. The increase in PET use has resulted in considerable volumes of waste PET ... Read more
Formic acid as additive for the preparation of high-performance FePO4 materials by spray drying method

Author: Yanga, F ; Zhang, H ; Shao, Y ; Song, H ; Liao, S ; Ren, Jianwei Date: Dec 2017 High-performance ferric phosphate (FePO4), with well-defined ellipsoid morphology and uniform particle size distribution, is successfully fabricated via a green spray drying method with formic acid as additive. It is found that the added ... Read more
Glucose-derived carbon supported well-dispersed CrN as competitive oxygen reduction catalysts in acidic medium

Author: Luo, J ; Tang, H ; Tian, X ; Liao, S ; Ren, Jianwei ; Zhao, W ; Qiao, X Date: Aug 2019 In this work, a glucose-derived carbon supported CrN composite is prepared by using a hydrothermal method and followed by a nitridating process. It is found that CrN nanoparticles in the composite are well-dispersed and separated by the carbon ... Read more

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