RESUMO
The vast number of element combinations and the explosive growth of composition space pose significant challenges to the development of high-entropy alloys (HEAs). Here, we propose a procedural research method aimed at accelerating the discovery of efficient electrocatalysts for oxygen reduction reaction (ORR) based on Pt-based quinary HEAs. The method begins with an element library provided by a large language model (LLM), combined with microscale precursor printing and pulse high-temperature synthesis techniques to prepare multi-element combination HEA array in one step. Through high-throughput measurement using scanning electrochemical cell microscopy (SECCM), precise identification of highly active HEA element combinations and exploration of composition space for a specific combination are achieved. Advantageous element combinations are further validated in practical electrocatalytic evaluations. The contributions of individual element sites and the synergistic effects among elements of such HEAs in enhancing reaction activity are elucidated via density functional theory (DFT) calculations. This method integrates high-throughput experiments, practical catalyst validation, and DFT calculations, providing a new pathway for accelerating the discovery of efficient multi-element materials in the field of energy catalysis.
RESUMO
Herein, a three-dimensional porous graphene oxide/alkali lignin aerogel composite was prepared by a simple green method, and its adsorption performance for methylene blue (MB) in water was studied. The graphene oxide/alkali lignin aerogel composite (GO-AL aerogel) was characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and the BET surface area. The adsorption kinetics study showed that the adsorption process conformed to the second-order kinetic model and this process was chemical adsorption. It was also found that intraparticle diffusion was not the only rate control step in the adsorption process. The adsorption isotherm study showed that the adsorption process conforms to the Langmuir isotherm adsorption model and the process was a single layer adsorption. The maximum adsorption capacity of MB on GO-AL aerogel was 1185.98 mg/g, at 303 K. Adsorption thermodynamics studies showed that adsorption process was a spontaneous endothermic process and the disorder increased during the adsorption process. Overall, this study indicated the GO-AL aerogel could be an eco-friendly, cost-effective and recyclable adsorbent for the removal of dyes from water.
