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Your search keyword '"Maluta, Nnditshedzeni Eric"' showing total 6 results
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6 results on '"Maluta, Nnditshedzeni Eric"'

1. Fe/Fe3C particles encapsulated in hollow carbon nanoboxes for high performance zinc–air batteries.

Author

Huang, Chuyun, Zhang, Wenyuan, Hu, Xuezhi, Fei, Shiliang, Nemangwele, Fhulufhelo, Maluta, Nnditshedzeni Eric, Hu, Yangsen, Lv, Hui, Hu, Pei, and Peng, Zhuo

Abstract

Zinc–air batteries are recognized for their environmental friendliness and high energy density; however, the slow kinetics of the oxygen reduction reaction (ORR) at the air electrode hinder their commercial viability. The research focuses on synthesizing cubic hollow carbon structures derived from Metal–Organic Frameworks (MOFs), which enhance catalytic performance through improved conductivity and mass transfer. The resulting Fe/Fe3C/HCNB catalyst demonstrates a half-wave potential of 0.826 V for ORR and achieves a peak power density of 274 mW cm−2 in zinc–air batteries, surpassing commercial Pt/C catalysts. Electrochemical impedance spectroscopy reveals that the hollow structure enhances hydrophilicity and reduces solution resistance, facilitating greater active site engagement in electrochemical reactions. The study concludes that the unique structural features of Fe/Fe3C/HCNB significantly improve discharge performance and stability, positioning it as a promising alternative for zinc–air battery applications. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Integrating project-based infrastructures with long-term greenhouse gas observations in Africa

Author

Bieri, Mari, du Toit, Justin, Maluta, Nnditshedzeni Eric, Mantlana, Brian, Mateyisi, Mohau, Midgley, Guy F., Mutanga, Shingirirai, von Maltitz, Graham, and Brummer, Christian

Subjects
South Africa, climate change, research collaboration, eddy covariance, capacity development
Abstract

There is a lack of long-term greenhouse gas (GHG) measurement infrastructures in Africa. This limits our understanding of the temporal dynamics of the biosphere-atmosphere exchange of carbon in response to climate change. Where relevant infrastructures have been established in externally funded research projects, they have often not been successfully transferred to local institutions at project termination, nor maintained in the long term. This leads to loss of capacity and continuity in primary data. We describe a collaborative approach where eddy-covariance (EC) towers for continuous long-term observation of carbon dioxide and energy fluxes were constructed under two consecutive German-funded research projects and designed to complement existing South African infrastructures. They will be transferred to partner institutions at project termination, supported by deliberate capacity building actions for long term sustainability. Joint activities were implemented to i) strengthen technical expertise for infrastructure maintenance, ii) introduce a new generation of academic scientists to the topic, iii) co-develop a training concept to enhance local capacity to continue teaching the topic, iv) improve the uptake and use of data by the research community, v) improve data use and access by stakeholders, and vi) facilitate knowledge exchange between institutions. Co-designed activities included training, apprenticeships and knowledge exchange, student exchange, co-supervision, and public outreach. Following a similar model in international research projects could significantly benefit 1) national capacity for emission inventories, 2) development of long-term GHG observation networks, and 3) the global scientific community via improved availability of data. While we specifically focus on a network of GHG observations, the principles are applicable for the infrastructure to observe other surface/atmosphere exchange processes or other long term observational infrastructure.

Published
2022

6. Fe/Fe 3 C particles encapsulated in hollow carbon nanoboxes for high performance zinc-air batteries.

Author

Huang C, Zhang W, Hu X, Fei S, Nemangwele F, Maluta NE, Hu Y, Lv H, Hu P, and Peng Z

Abstract

Zinc-air batteries are recognized for their environmental friendliness and high energy density; however, the slow kinetics of the oxygen reduction reaction (ORR) at the air electrode hinder their commercial viability. The research focuses on synthesizing cubic hollow carbon structures derived from Metal-Organic Frameworks (MOFs), which enhance catalytic performance through improved conductivity and mass transfer. The resulting Fe/Fe 3 C/HCNB catalyst demonstrates a half-wave potential of 0.826 V for ORR and achieves a peak power density of 274 mW cm -2 in zinc-air batteries, surpassing commercial Pt/C catalysts. Electrochemical impedance spectroscopy reveals that the hollow structure enhances hydrophilicity and reduces solution resistance, facilitating greater active site engagement in electrochemical reactions. The study concludes that the unique structural features of Fe/Fe 3 C/HCNB significantly improve discharge performance and stability, positioning it as a promising alternative for zinc-air battery applications.

Published
2024
Full Text
View/download PDF

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