The technology of using electricity generated from renewable energy sources such as wind and solar power for water electrolysis to produce hydrogen has achieved high efficiency, high purity, and environmental friendliness. However, its further development is constrained by the high overpotential of the oxygen evolution reaction (OER) and the high cost of precious metal catalysts. The methanol oxidation reaction (MOR) as an alternative to OER can significantly reduce overall energy consumption and accelerate the hydrogen evolution reaction. This study innovatively utilizes the metal-organic framework (MOF) of NH₂-MIL-88(Fe) to introduce Ni doping, preparing a series of Fe x Ni y -MOF and their bimetallic carbon derivatives (Fe x Ni y /C) through solvothermal synthesis and high-temperature carbonization. Results show that FeNi₂/C exhibited excellent performance in OER, with a Tafel slope of 38.69 mV·dec⁻ 1 and an overpotential of 335 mV at 10 mA cm⁻ 2 , comparable to RuO₂. In MOR, the overpotential was 193 mV, reduced by approximately 140 mV compared to OER, with outstanding stability. The catalytic mechanism was analyzed using ion chromatography, revealing the key role of Ni doping in enhancing catalytic activity and stability. This study provides new strategies for improving the electrocatalytic hydrogen production efficiency of renewable energy and reducing the production cost of hydrogen energy.
Liquid organic hydrogen carriers (LOHCs) are considered as promising candidates for large-scale hydrogen storage, which offers significant advantages in terms of hydrogen storage density, ease of storage and transportation. NPhCZ (N-phenylcarbazole)/18H-NPhCZ (perhydro-N-phenylcarbazole) is proposed as a typical system with high hydrogen storage capacity. However, low dehydrogenation activity and selectivity of catalysts restrict the cyclic efficiency of hydrogen storage. In this study, the efficient catalysts are designed by the immobilization of ultrafine, highly dispersed Pd nanoparticles onto Ni, N co-doped carbon materials through wet chemical reduction. The Pd/Ni@NC-10 catalyst exhibits the highest catalytic performance with 100 % conversion, 81.9 % selectivity of NPhCZ and 6.48 wt% hydrogen release amount. Combined with XRD, HRTEM, Raman, XPS, H 2 -TPR, N 2 physisorption characterization methods and DFT calculations, it is found that the doped Ni, N species could synergistically increase the dispersion of loaded Pd nanoparticles, as well as regulate the electronic state around Pd, which in turn accelerates the rate of the rate-limiting step. The evident interaction between Pd nanoparticles and Ni, N co-doped carbon brings the enhancement of dehydrogenation efficiency. Besides, the spent catalysts are measured by XRD, TEM, XPS and evaluated for the dehydrogenation reaction, indicating that Pd/Ni@NC-10 shows good structural stability, durability and recyclability. It provides practical guidance for the design of LOHCs dehydrogenation catalysts.
Sifan Bao,Xudong Zheng,Zihuai Xu,Zhouzhou Yang,Wei Sun,Jinfeng Mei,Jian Rong,Zhongyu Li
Carbon aerogel is limited in its application in CO 2 capture due to its poor surface properties. Heteroatom doping is conducive to the adsorption of CO 2 by biochar. Therefore, by in-situ synthesis of nitrogen-doped carbon nanotubes on BC, Ni/N co-doped cellulose carbon aerogel was synthesized, and the results showed excellent adsorption capacity and reversible adsorption/desorption properties. The synthesis of nitrogen-doped carbon nanotubes made the material realize N doping and provided more adsorption sites for CO 2 adsorption. When Ni is dispersed in the material, it not only increases the carbon dioxide adsorption sites but also enhances the thermal stability and cycling performance of the composite material. Meanwhile, the coordination effect between nickel and nitrogen further enhances the capture capacity of carbon dioxide. Ultimately, the adsorption capacity of the modified biochar reached 4.89 mmol/g, and it also has good recycling performance. The unique co-doping design strategy reduces the dependence of traditional carbon materials on surface area when adsorbing CO 2 , providing a new direction for the modification of carbon materials.
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