Publications by authors named "Khai Chen Tan"

Article Synopsis
  • - Replacing traditional liquid electrolytes with solid-state electrolytes (SSEs) in sodium-ion batteries can improve safety, but SSEs face challenges like low ionic conductivity and manufacturing difficulties.
  • - Researchers developed sodium carbazolide (Na-CZ) and its THF-coordinated derivatives, achieving high sodium conductivities, particularly at 90°C, making them leading sodium conductors.
  • - These materials demonstrate excellent interfacial stability with sodium electrodes during extensive cycling, and their ease of synthesis and low-cost production methods make them promising for practical battery applications.
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Sodium phenoxide is a potentially promising hydrogen storage material due to its high hydrogen capacity and enhanced thermodynamic properties. Nevertheless, efficient catalysts are still lacking due to the high kinetic barrier for the reversible hydrogen uptake and release of sodium phenoxide. In the current work, a comparative study on the catalytic hydrogenation of sodium phenoxide was conducted.

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Hydrazine borane (HB) is a chemical hydrogen storage material with high gravimetric hydrogen density of 15.4 wt%, containing both protic and hydridic hydrogen. However, its limitation is the formation of unfavorable gaseous by-products, such as hydrazine (NH) and ammonia (NH), which are poisons to fuel cell catalyst, upon pyrolysis.

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The development of ionic conductors as solid-state electrolytes to replace the widely used liquid electrolytes could effectively solve the safety issues as well as enhance the energy density of batteries. Yet no ionic conductors to date could meet all the criteria of solid-state electrolytes for practical applications. Therefore, exploration of new materials is highly demanded.

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Fabrication of sufficient oxygen vacancies and exposure of active sites to reactants are two key factors to obtain high catalytic activity in the water-gas shift (WGS) reaction. However, these two factors are hard to satisfy spontaneously, since the formation of oxygen vacancies and encapsulation of metal nanoparticles are two inherent properties in reducible metal oxide supported catalysts due to the strong metal-support interaction (SMSI) effect. In this work, we find that addition of alkali to an anatase supported Ni catalyst (Ni/TiO(A)) could well regulate the SMSI to achieve both more oxygen vacancies and depression of encapsulation; therefore, more than 20-fold enhancement in activity is obtained.

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Storing hydrogen efficiently in condensed materials is a key technical challenge. Tremendous efforts have been given to inorganic hydrides containing B-H, Al-H and/or N-H bonds, while organic compounds with a great variety and rich chemistry in manipulating C-H and unsaturated bonds, however, are undervalued mainly because of their unfavourable thermodynamics and selectivity in dehydrogenation. Here, we developed a new family of hydrogen storage material spanning across the domain of inorganic and organic hydrogenous compounds, namely metallo-N-heterocycles, utilizing the electron donating nature of alkali or alkaline earth metals to tune the electron densities of N-heterocyclic molecules to be suitable for hydrogen storage in terms of thermodynamic properties.

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The lack of efficient hydrogen storage material is one of the bottlenecks for the large-scale implementation of hydrogen energy. Here, a series of new hydrogen storage materials, i.e.

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