Research Articles (SAIAMC)http://hdl.handle.net/10566/1572024-03-28T12:52:07Z2024-03-28T12:52:07ZLanthanum modified Fe3N/carbon foam as highly efficient electrode for zinc-air batteriesWang, MLinkov, VJi, Shttp://hdl.handle.net/10566/91442023-06-27T00:00:56Z2023-01-01T00:00:00ZLanthanum modified Fe3N/carbon foam as highly efficient electrode for zinc-air batteries
Wang, M; Linkov, V; Ji, S
Efficient electrocatalysts for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) are of great importance for large-scale application of rechargeable zinc-air batteries. Iron-nitrogen-carbon materials are known for their excellent ORR catalytic activity, but it is their low OER performance that is responsible for poor charging operation causing slow market adoption of these energy storage devices. Herein, lanthanum (La) is applied to enhance OER electrocatalytic properties of iron-nitrogen-carbon materials used as zinc-air battery electrodes. According to X-ray diffractometry, the presence of La alters the electronic structure of surrounding N and Fe elements, resulting in more negative N and positive Fe ions to appear on the surface and form Fe3N active species. Electrochemical analysis demonstrated enhanced bi-functional electrocatalytic performance of La-modified Fe3N carbon foam (La-Fe0.1:1/NFC) which total overpotential was among the lowest of previously reported metal-nitrogen-carbon materials. La-Fe0.1:1/NFC exhibited high power density and charge-discharge cycling stability in a real zinc-air battery cell.
2023-01-01T00:00:00ZMetal hydride beds-phase change materials: Dual mode thermal energy storage for medium-high temperature industrial waste heat recoveryNyamsi, Serge NyallangTolj, IvanLototskyy, Mykhaylohttp://hdl.handle.net/10566/90582023-06-08T00:01:00Z2019-01-01T00:00:00ZMetal hydride beds-phase change materials: Dual mode thermal energy storage for medium-high temperature industrial waste heat recovery
Nyamsi, Serge Nyallang; Tolj, Ivan; Lototskyy, Mykhaylo
Heat storage systems based on two-tank thermochemical heat storage are gaining
momentum for their utilization in solar power plants or industrial waste heat recovery since
they can e ciently store heat for future usage. However, their performance is generally limited
by reactor configuration, design, and optimization on the one hand and most importantly on the
selection of appropriate thermochemical materials. Metal hydrides, although at the early stage of
research and development (in heat storage applications), can o er several advantages over other
thermochemical materials (salt hydrates, metal hydroxides, oxide, and carbonates) such as high
energy storage density and power density. This study presents a system that combines latent heat
and thermochemical heat storage based on two-tank metal hydrides. The systems consist of two
metal hydrides tanks coupled and equipped with a phase change material (PCM) jacket.
2019-01-01T00:00:00ZEx-situ electrochemical characterization of iro2 synthesized by a modified Adams fusion method for the oxygen evolution reactionFelix, CecilBladergroen, Bernard J.Linkov, Vladimirhttp://hdl.handle.net/10566/90292023-06-07T00:00:54Z2019-01-01T00:00:00ZEx-situ electrochemical characterization of iro2 synthesized by a modified Adams fusion method for the oxygen evolution reaction
Felix, Cecil; Bladergroen, Bernard J.; Linkov, Vladimir
The development of highly stable and active electrocatalysts for the oxygen evolution
reaction (OER) has attracted significant research interest. IrO2 is known to show good stability
during the OER however it is not known to be the most active. Thus, significant research has
been dedicated to enhance the activity of IrO2 toward the OER. In this study, IrO2 catalysts were
synthesized using a modified Adams fusion method. The Adams fusion method is simple and
is shown to directly produce nano-sized metal oxides. The effect of the Ir precursor salt to the
NaNO3 ratio and the fusion temperature on the OER activity of the synthesized IrO2 electrocatalysts,
was investigated. The OER activity and durability of the IrO2 electrocatalysts were evaluated ex-situ
via cyclic voltammetry (CV), chronopotentiometry (CP), electrochemical impedance spectroscopy
(EIS) and linear sweep voltammetry (LSV).
2019-01-01T00:00:00ZHighly-dispersed vanadium nitride supported on porous nitrogen-doped carbon material as a high-performance cathode for lithium-sulfur batteriesWang, LiSun, ChaoyangLinkov, Vladimirhttp://hdl.handle.net/10566/86722023-03-29T00:01:29Z2022-01-01T00:00:00ZHighly-dispersed vanadium nitride supported on porous nitrogen-doped carbon material as a high-performance cathode for lithium-sulfur batteries
Wang, Li; Sun, Chaoyang; Linkov, Vladimir
Transition metals and their compounds supported on carbon materials are widely used as cathodes for lithium-sulfur batteries. Vanadium nitride is considered to be a promising cathode because of its good adsorption capacity for lithium polysulfides and high catalytic activity, but in practice it usually shows insufficient electrical conductivity and low electrocatalytic activity due to particles agglomeration. In this study, highly dispersed vanadium nitride supported on porous nitrogen-doped carbon was prepared via one-pot pyrolysis in a molten salt medium. Physical characterization revealed VN particles with a uniform size distribution of ca. 10 nm well dispersed on the carbon surface. When used as a cathode for Li−S battery, the material delivered a specific discharge capacity of 1050 mAh g−1 at 0.2 C and good rate performance. During the stability test over 500 continuous cycles, the average decay rate was 0.059 % per cycle. The study demonstrates prospective application of the newly developed electrocatalytic material as a cathode in lithium-sulfur batteries.
2022-01-01T00:00:00Z