This study introduces a self-driven system that effectively achieves synchronized sulfur recovery and hydrogen production using a Zn-air battery. The system ingeniously integrates the sulfur oxidation reaction (SOR) and the hydrogen evolution reaction (HER) into a single, efficient process. Central to this system is the trifunctional phosphorus-doped cobalt molybdate catalyst (P-CoMoO/NF), which exhibits superior performance in both HER (η = 0.13 V) and SOR (η = 0.30 V) with remarkable stability (∼360 h), reaching 0.64 V at 100 mA cm for simultaneous sulfur ion degradation and hydrogen production. Through density functional theory simulations and extensive characterizations, it has been shown that phosphorus doping in the cobalt molybdate catalyst facilitates electron redistribution, enhancing the catalyst's conductivity, generating more oxygen vacancies, and promoting improved mass and electron transfer. This modification also lowers the energy barrier for adsorbing reaction intermediates, thus increasing the hydrogen production rate and sulfur oxide conversion in this self-powered system. In summary, this research marks a substantial advancement in the development of trifunctional catalysts and proposes an eco-friendly, cost-effective strategy for integrated reaction systems, paving the way for sustainable energy solutions.
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http://dx.doi.org/10.1016/j.jcis.2024.06.051 | DOI Listing |
Environ Res
December 2024
Key Laboratory of the Evaluation and Monitoring of Southwest Land Resources (Ministry of Education), Sichuan Normal University, Chengdu, 610068, China; College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610068, China. Electronic address:
Metal oxides-catalyzed peroxymonosulfate (PMS) activation systems show promise in decomposing organic pollutants, whereas the critical challenges such as catalyst aggregation and metal ion leaching significantly impact the stability and reusability of catalysts and thus limit widespread application. To address these issues, an effective self-supported three-dimensional PMS activator consisted of spinel cobalt molybdate (CoMoO) and nickel foam (NF) (CoMoO/NF) is fabricated through hydrothermal and annealing processes. The cooperative redox interaction between Co and Mo metal sites in CoMoO/NF play a crucial role in efficiently activating PMS to degrade 4-nitrophenol (4-NP).
View Article and Find Full Text PDFDalton Trans
December 2024
College of Chemistry and Materials Science, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecular-Based Materials, Key Laboratory of Electrochemical Clean Energy of Anhui Higher Education Institutes, Anhui Normal University, Wuhu 241000, P. R. China.
Hydrogen is an ideal alternative energy sources as it is non-polluting and clean. The main commercial materials used for hydrogen production from electrolytic water are precious metals. Their high price has a negative impact on the industrialisation of electrolytic water, and there is an urgent need to research highly active and durable non-precious metal materials to replace them.
View Article and Find Full Text PDFJ Colloid Interface Sci
December 2024
National Engineering Research Center of Vacuum Metallurgy, Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China. Electronic address:
Optimizing hydrogen adsorption and enhancing water absorption are essential for the design of effective hydrogen evolution reaction (HER) electrocatalysts. Herein, a well-defined core-shell-structured P-CoNiMoO@CoP-NiP catalyst was synthesized on nickel foam via high-temperature phosphidation of heterostructured precursor CoMoO·xHO/NiMoO·xHO with hydrogen (H) assistance. This catalyst exhibits good HER performance, requiring only 24 mV of overpotential to achieve a current density of 10 mA cm, and long-term stability, maintaining a current density of 100 mA cm for over 100 h.
View Article and Find Full Text PDFMolecules
October 2024
College of Marine Equipment and Mechanical Engineering, Key Laboratory of Energy Cleaning Utilization, Development, Cleaning Combustion and Energy Utilization Research Center of Fujian Province, Xiamen Key Laboratory of Marine Corrosion and Smart Protective Materials, Jimei University, Xiamen 361021, China.
Lithium-sulfur batteries (Li-S batteries) have attracted wide attention due to their high theoretical energy density and the low cost of sulfur cathode material. However, the poor conductivity of the sulfur cathode, the polysulfide shuttle effect, and the slow redox kinetics severely affect their cycling performance and Coulombic efficiencies, especially under low-temperature conditions, where these effects are more exacerbated. To address these issues, this study designs and synthesizes a microspherical cobalt molybdate@reduced graphene oxide (CoMoO@rGO) composite material as the cathode material for Li-S batteries.
View Article and Find Full Text PDFJ Colloid Interface Sci
February 2025
State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, P. R. China. Electronic address:
Advancing the development of proficient bifunctional water splitting electrocatalysts and deciphering the underlying drivers of their performance are pivotal for accelerating the sustainable hydrogen energy sector. In this study, a novel Fe and P dual-doped cobalt molybdate electrocatalyst (P-FCMO@NF) is engineered in-situ on a nickel foam substrate that induces an archipelago-like amorphous-crystalline heterointerface as well as abundant oxygen vacancies (V) on the near-surface, in favor of the electron transport and enhancing the water splitting capability respectively. Consequently, P-FCMO@NF exhibits excellent electrocatalytic performance in 1 M KOH solution.
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