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Hydrogen storage in clathrate hydrate is considered to be a potential technology with high energy density. However, the problems of low gas storage capacity and slow hydrate formation hinder its application. In this work, several strengthen methods were investigated to improving hydrogen storage capacity and rate in epoxycyclopentane (ECP) hydrates at moderate pressure. The results showed that the ECP hydrate particles could promote the formation of hydrate. It was found that the gas storage capacity and the rate increased with the decrease in ECP hydrate particle sizes. After dispersing ECP hydrate particles on stainless steel mesh, the gas storage capacity can be further increased to 71.2 cm3/cm3 hydrate (0.64 wt%), and the average gas storage rate can be further increased to 26.51 cm3/(cm3 hydrate h−1). It was found that decreasing particle size of hydrate could increase the gas-solid interface area and raised the gas adsorption rate and adsorption amount. The stainless-steel mesh partitions improved the hydrogen storage capacity due to the good thermal conductivity that reduced the influence of hydrate formation heat and dispersing the hydrate particles that reduced the diffusion distance of hydrogen in the pores. These findings provide fundamental insights into the development of clathrate hydrate-based H 2 storage technology. [Display omitted] • A superior promoter (ECP) is used for hydrogen storage in hydrate. • The hydrogen storage capacity of ECP hydrate particles with stainless steel mesh can reach 0.64 wt%. • Storage H 2 in ECP hydrate particles exhibits high storage rates without induction time. • The hydrogen storage capacity of ECP system was 1.12–3.44 times more than that of the other additives systems. [ABSTRACT FROM AUTHOR]

Long-haul heavy-duty freight sector has always been relying on diesel fuel and hard to decarbonize. Hydrogen fuel-cell trucks (HFCTs) can play a critical role in substituting the diesel trucks and achieving carbon neutrality in freight sector. However, the extremely high cost has impeded their penetration. This paper proposed that government could harness freight platform to promote HFCTs by issuing the platform licenses with strings attached that priority dispatch and commission discount have to be provided to HFCT drivers. To simulate the effects of the proposed policy instruments, an optimization model was developed and applied. The results validated the ability of both priority dispatch and commission discount to promote HFCTs' penetration. And combining the two mechanisms together can at most decrease the need for subsidy by 79%. Then the environmental effects were evaluated and the obtained emissions abatement cost ranges from 584 to 3712 RMB/t, which significantly exceeds the current carbon price in China. Besides, sensitivity analyses of key parameters have been conducted. It is found that the effects on promoting HFCT penetration of increasing subsidy is marginal diminishing. Business model innovation as well as further cost reduction of trucks and hydrogen fuels through technology progress are still in need. • The platform-based policies are proposed to develop hydrogen trucks. • Priority dispatch and commission discount can promote hydrogen trucks' penetration. • The CO 2 abatement cost of the proposed policies ranges from 584 to 3712 RMB/t. • The effect of subsidy on hydrogen trucks promotion is marginal diminishing. [ABSTRACT FROM AUTHOR]

This article contributes to the existing literature by examining the nonlinear relationship between industrial structure, energy intensity and environmental efficiency across developed and developing countries by utilizing three sectors of industry i.e., Primary, Secondary and Tertiary industry. Panel data includes 64 Belt and Road Initiative (BRI) from 2000 to 2017, which are further divided into two groups of developed and developing countries. SBM-DEA model is employed to measure the environmental efficiency. Random effect (RE) and Fixed effect (FE) models are employed as basic estimating techniques, while IV-GMM (Generalized Method of Moments) is utilized as robust estimator to handle endogeneity problem. The results of SBM-DEA model show that the environmental efficiency of BRI countries has deteriorated over the years. However, developed countries have the higher average environmental efficiency than developing countries. The results further show that all three sectors of industry deteriorate environmental efficiency. However, the negative impact of secondary industry on environment is more severe than primary and tertiary industry particularly across developing countries. Furthermore, a nonlinear U-shaped curve is confirmed only between secondary industry and environmental efficiency across developed countries. Our findings suggest that adopting industrial agglomeration approach and restructuring energy system can improve environmental efficiency. • Explored the nonlinear nexus between industrial structure and environmental efficiency. • Industrial structure deteriorates environmental efficiency. • The negative impact of secondary industry on environment is more severe. [ABSTRACT FROM AUTHOR]