The hydrogen economy: A pragmatic path forward

Dowell, Niall Mac; Sunny, Nixon; Brandon, Nigel; Herzog, Howard J.; Ku, Anthony Y.; Maas, Wilfried; Ramírez, Andrea; Reiner, David; Sant, Gaurav; Shah, Nilay

doi:10.1016/j.joule.2021.09.014

Cited by 120 publications

(63 citation statements)

References 2 publications

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“…Hydrogen has been considered as one of the most promising candidates to alternate fossil fuels, due to its intrinsic clean nature, environmental-friendliness, and high gravimetric energy density (142 MJ kg −1 ) [ 1 – 4 ]. However, an effective strategy to store hydrogen is essential to realizing the "hydrogen economy" [ 5 , 6 ]. Compared with hydrogen storage in pressurized tanks or cryogenic containers, solid-state hydrogen storage methods potentially have the advantages of high safety, low cost, and exceptional hydrogen storage capacity [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Oxygen Vacancy-Rich 2D TiO2 Nanosheets: A Bridge Toward High Stability and Rapid Hydrogen Storage Kinetics of Nano-Confined MgH2

Ren

Zhu

et al. 2022

Nano-Micro Lett.

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MgH2 has attracted intensive interests as one of the most promising hydrogen storage materials. Nevertheless, the high desorption temperature, sluggish kinetics, and rapid capacity decay hamper its commercial application. Herein, 2D TiO2 nanosheets with abundant oxygen vacancies are used to fabricate a flower-like MgH2/TiO2 heterostructure with enhanced hydrogen storage performances. Particularly, the onset hydrogen desorption temperature of the MgH2/TiO2 heterostructure is lowered down to 180 °C (295 °C for blank MgH2). The initial desorption rate of MgH2/TiO2 reaches 2.116 wt% min−1 at 300 °C, 35 times of the blank MgH2 under the same conditions. Moreover, the capacity retention is as high as 98.5% after 100 cycles at 300 °C, remarkably higher than those of the previously reported MgH2-TiO2 composites. Both in situ HRTEM observations and ex situ XPS analyses confirm that the synergistic effects from multi-valance of Ti species, accelerated electron transportation caused by oxygen vacancies, formation of catalytic Mg-Ti oxides, and stabilized MgH2 NPs confined by TiO2 nanosheets contribute to the high stability and kinetically accelerated hydrogen storage performances of the composite. The strategy of using 2D substrates with abundant defects to support nano-sized energy storage materials to build heterostructure is therefore promising for the design of high-performance energy materials.

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Section: Introductionmentioning

confidence: 99%

Oxygen Vacancy-Rich 2D TiO2 Nanosheets: A Bridge Toward High Stability and Rapid Hydrogen Storage Kinetics of Nano-Confined MgH2

Ren

Zhu

et al. 2022

Nano-Micro Lett.

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“…Hydrogen is widely considered both a promising industrial feedstock and a potentially important future energy carrier in the context of decarbonisation [1][2][3] . The current global hydrogen demand of 75 million tonnes per year is predominantly met with so-called 'grey' hydrogen, produced from natural gas 4 .…”

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confidence: 99%

The many greenhouse gas footprints of green hydrogen

Kleijne¹,

Coninck

Zelm³

et al. 2022

Sustainable Energy Fuels

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“…Finally, in the context of delivering the hydrogen economy there are important environmental and techno-economic trade-offs that need to be addressed, especially considering the ambitious targets set out by the EU and the UK. Firstly, for blue hydrogen to be a viable low carbon option, the management of the natural gas supply chain is vital, so that methane leakage, currently in the range of 2.9–35.75 kg CO2, eq /GJ LHV are minimized ( Mac Dowell et al, 2021 ). At the same time, the deployment of blue hydrogen at the pace and scale indicated by national and international policy strategies, is contingent on the availability of CCS transport and storage infrastructure, which deployment within the European context, is highly controversial.…”

Section: Discussionmentioning

confidence: 99%