Energy & Fuels

Abstract The microbial electrolysis cell (MEC) enables green biohydrogen production from waste through bioelectrochemical conversion, with a cathode catalyst driving hydrogen recovery. However, conventional cathode catalysts, such as platinum, are cost-intensive owing to expensive precursors and energy-intensive synthesis routes. Thus, in this investigation, terephthalic acid linkers derived from…

Abstract In the goaf environment, the low-temperature oxidation of residual coal exhibits significant time-dependent evolution characteristics, and the slow temperature-rising process can be approximately regarded as a series of continuous isothermal reaction stages. Based on sealed isothermal oxidation experiments conducted on three coal samples with different metamorphic degrees, an isothermal …

Abstract Lithium-rich manganese-based (LRM) cathode materials have attracted considerable attention for next-generation lithium-ion batteries owing to their superior energy density. However, their cycling stability in conventional electrolytes is severely challenged by the high operating voltage (4.8 V vs. Li/Li+), particularly under fast-charging and low-temperature conditions. To overcome this …

Abstract Primary and secondary recovery methods typically leave 60–70% of original oil in place due to capillary trapping, adverse mobility ratios, and reservoir heterogeneity. Enhanced oil recovery (EOR) targets this residual oil through thermal, chemical, gas, microbial, hybrid, and nanofluid-based processes that alter pore-scale forces to improve displacement and sweep efficiency. Thermal meth…

Abstract The large-scale production of sustainable aviation fuels (SAFs) heavily relies on hydrogen supply, while traditional hydrogen storage and delivery suffer from safety risks and high cost. Hydrogen peroxide (H2O2) is regarded as a promising hydrogen carrier, which can be produced on-site through a green electrochemical two-electron oxygen reduction reaction (2e– ORR). Herein, oxygen, nitro…

Abstract Under air operation, Sr-containing perovskite cathodes lose activity mainly because the surface Sr species readily react with CO2, rather than because the intrinsic Co/Fe redox centers are insufficiently active. A mild acid treatment was introduced to selectively regulate the surface A-site environment of perovskite oxides, with the aim of suppressing Sr-derived carbonation while retaini…

Abstract To support the optimization and screening of catalysts for the residue hydrodesulfurization (HDS) process, it is essential to conduct in-depth characterization of sulfur-containing compounds (SCCs) in the residue. In this study, a combination of 13C-methylation derivatization and 13C nuclear magnetic resonance (NMR) spectroscopy was employed to investigate the structural details of sulfu…

Abstract Shale has a small pore size and complex mineral composition, and the process of gas injection for enhanced oil recovery is controlled by multiple factors, among which the microscopic displacement mechanism still lacks systematic understanding. This study is based on molecular dynamics (MD) to investigate the displacement behavior of CO2/N2 in nanopores, exploring the effects of pore size…

Abstract Simultaneous esterification and acetalization of bio-oil with ethanol using commercial Amberlyst catalysts at temperatures between 60 and 170 °C were carried out to obtain a less acidic bio-oil with improved stability for small residual boilers. The bio-oil used in the experiments was produced from bark-free pine sawdust, and it was partially dewatered using azeotropic distillation with …

Abstract Hydrate-based hydrogen storage (HBHS) has emerged as a promising alternative for safe and reversible H2 storage under milder conditions than conventional high-pressure or cryogenic approaches. However, the storage capacity of mixed H2/THF hydrates remains limited by slow H2 diffusion and low cage occupancy. In this work, the influence of perchloric acid (HClO4) on the thermodynamic stabi…

Abstract Developing sustainable and hydrogen-efficient catalytic strategies for lignin valorization remains a significant challenge for renewable energy and environmental applications. Herein, we report a defect-engineered, oxygen vacancy–rich Ni–Ru/HO–TiOx catalyst for selective catalytic transfer hydrogenolysis (CTH) of β-O-4 lignin model compounds and native hardwood lignin into value-added ch…

Abstract Aiming at the insufficient kinetic promotion of methane hydrate in binary amino acid−β-cyclodextrin liquid systems and their deviation from the real geological environment of submarine sediments, this paper constructs a ternary green promotion system consisting of amino acid, β-cyclodextrin, and porous media, and investigates the effects of two typical submarine minerals (quartz sand and…

Abstract Halide and organic linker-free, all-inorganic cubic (ABO3) and Ruddlesden–Popper perovskites (RPPs) with the general formula An+1BnO3n+1 are less explored in the field of alcohol fuel cells. Subsequently, the impact of variation in the synthesis approach leading to phase transformation with the change of nanoarchitecture is also not known, especially for compositional high-entropy-based …

Abstract Natural gas hydrates in marine sediments and permafrost are a promising transition fuel, but effective recovery is hindered by reservoir instability and low production efficiency, largely affected by geomaterial microstructure and hydrate distribution. Synchrotron radiation X-ray computed tomography (SR-XCT) has been used to characterize these parameters. This technique enables high-reso…

Abstract The strong water sensitivity of marine-continental transitional shale renders conventional hydraulic fracturing techniques inadequately applicable, while methane in situ deflagration fracturing represents a transformative waterless stimulation technology. However, the response of the pore-fracture system in the Shanxi Formation marine-continental transitional shale to varying deflagratio…

Abstract Water-lock effects can impair gas transport in low-permeability hydrate-bearing clayey-silt sediments. However, current screening strategies for candidate mitigation formulations rely primarily on macroscopic measurements and provide limited insight into pore-scale liquid invasion and gas trapping. Previous microfluidic studies have focused mainly on fundamental two-phase displacement be…

Abstract The dissolution of dilute concentrations of surfactants in CO2 is emerging as a promising method for improving huff-and-puff oil recovery from shale or low permeability rock. The benefit of surfactant addition is primarily attributable to wettability alteration away from oil-wet toward CO2-wet. Field-scale implementation of this method requires cost-effective, pumpable surfactants that a…

Abstract Marine natural gas hydrate (NGH) reservoirs in deep-sea and permafrost regions are inherently under true triaxial stress states (σ1 ≠ σ2 ≠ σ3) owing to tectonic activities and overpressure fluids. Conventional axisymmetric triaxial tests fail to replicate the in situ conditions, yielding sediment deformation and fracture initiation behaviors that deviate fundamentally from the true reser…

Abstract During the blockage of deep-sea natural gas pipelines, the deposited hydrates on the pipe wall undergo the shedding–redeposition process under varying fluid shear forces, which occurs repeatedly, causing abnormal fluctuations in the pipeline pressure drop curve. However, the characteristics of these fluctuations have long been poorly understood, affecting the assessment of the evolution …

Abstract The increasing demand for efficient and sustainable energy storage has accelerated research into supercapacitors (SCs), which provide high power density and a long cycle life. However, their poor performance remains a major drawback. The layered structure and rich redox chemistry of α-MoO3 make it a promising material for SCs. Despite its advantages, the inherent low conductivity and lim…