Iron based catalyst for the improvement of the sorption properties of KSiH3

Sharma, Shashi; Guo, Fangqin; Ichikawa, Takayuki; Kojima, Yoshiyuki; Agarwal, Shivani; Jain, Ankur

doi:10.1016/j.ijhydene.2020.07.273

Cited by 6 publications

(8 citation statements)

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“…The Nb 2 O 5 was observed as the most promising catalyst among all the catalysts due to its effectiveness in reducing the activation energy down to 63 kJ mol −1 in contrast to 142 kJ mol −1 for as-prepared KSi. Similar studies showcasing the successful utilization of catalysts were performed by using nanometals (i.e., Ni, Co, Nb [ 9 ]), NbF 5 [ 10 ], iron-based compounds (i.e., FeO, Fe, Fe 3 O 4 and Fe 2 O 3 [ 11 ]), vanadium-based catalysts [ 12 ], and Ti compounds [ 13 ] etc. As a result of this approach, kinetics was improved, activation energy was reduced, and activation cycles were eliminated.…”

Section: Introductionmentioning

confidence: 90%

XPS Investigation on Improving Hydrogen Sorption Kinetics of the KSiH3 System by Using Zr-Based Catalysts

et al. 2022

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The superior hydrogen storage properties makes the KSiH3 system a potential hydrogen storage material for practical applications. A theoretical capacity of 4.3 wt% bring this material to the front line of all the available hydrogen storage materials; however, the activation barrier of the reaction restricts the system to absorb and desorb hydrogen reversibly at elevated temperatures even if the thermodynamics suggest its room temperature operation. Several catalysts have already been tested to enhance its kinetic properties. In this work, the efforts were made to reduce the activation energy by using Zr-based catalysts to the KSi/KSiH3 system. The value of activation energy was found to be lowest (i.e., 87 kJ mol−1) for the ZrH2-added KSiH3 system. The mechanism of this improvement was investigated by using X-ray photoelectron spectroscopy (XPS).

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Section: Introductionmentioning

confidence: 90%

XPS Investigation on Improving Hydrogen Sorption Kinetics of the KSiH3 System by Using Zr-Based Catalysts

et al. 2022

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“…Among them, nano Ni was found to be the most effective catalyst, having minimum activation energy 106 kJ mol −1 compared with the others. Recently, the effect of Fe was also found to be exciting for the improvement of the sorption properties of KSiH 3 [24]. Pozzo et al verified the superior catalytic properties by DFT calculations of Ni and Fe from d-block elements and announced Ni and Fe as the most active catalysts [53].…”

Section: D-block (Transition Metal) Elements As Catalystmentioning

confidence: 99%

“…where E a = activation energy, k= rate constant, A= frequency factor, R = gas constant (8.3145 J mol −1 K −1 ), T = temperature, β = heating rate and T p = peak temperature. The issue of kinetics in hydrogen storage materials has been investigated for a long time by continuous inventions of different techniques such as (nanosizing) ball milling and nanoconfinement, use of catalyst and thin films [24][25][26][27]. The problem of kinetics occurs because of the complexity of these hydride materials.…”

Section: Basic Understanding Of Kinetics and A Light On The Kinetics Of Metal Hydridementioning

confidence: 99%

“…In summary, it can be understood that improving the hydrogen de/absorption kinetics means reducing the activation barrier involved with the rate-limiting steps. There are many techniques and methods to improve kinetics reported by different groups such as nanoscaling, nanoconfinement, use of catalyst, doping and alloying [24][25][26][27]64]. However, in our perspective, alloying is basically a way to alter the thermodynamics of the system and does not affect the kinetics directly.…”

Section: Mechanism Of Hydrogen Absorption/desorption and Need Of Catalystmentioning

confidence: 99%

“…It is well known that many different materials, alloys, complex hydrides and composites have been used for the purpose of hydrogen storage [11,15,24,26,[67][68][69][70][71][72]. Even if surface oxidation can be fixed by sample activation and other related methods, it takes a long time to desorb/absorb hydrogen by hydride materials and hence this makes it almost impossible for practical usage.…”

Section: D-block (Transition Metal) Elements As Catalystmentioning

confidence: 99%

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The Catalytic Role of D-block Elements and Their Compounds for Improving Sorption Kinetics of Hydride Materials: A Review

et al. 2021

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The goal of finding efficient and safe hydrogen storage material motivated researchers to develop several materials to fulfil the demand of the U.S. Department of Energy (DOE). In the past few years, several metal hydrides, complex hydrides such as borohydrides and alanates, have been researched and found efficient due to their high gravimetric and volumetric density. However, the development of these materials is still limited by their high thermodynamic stability and sluggish kinetics. One of the methods to improve the kinetics is to use catalysts. Among the known catalysts for this purpose, transition metals and their compounds are known as the leading contender. The present article reviews the d-block transition metals including Ni, Co, V, Ti, Fe and Nb as catalysts to boost up the kinetics of several hydride systems. Various binary and ternary metal oxides, halides and their combinations, porous structured hybrid designs and metal-based Mxenes have been discussed as catalysts to enhance the de/rehydrogenation kinetics and cycling performance of hydrogen storage systems.

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