2D composite electrocatalyst HER performance and grey relational dataset

This dataset compiles literature-derived electrocatalytic performance data for two-dimensional (2D) and 2D-derived composite materials used in the hydrogen evolution reaction (HER). The dataset includes 50 catalyst systems spanning a wide range of material classes, including transition metal dichalcogenides, metal–organic frameworks, phosphides, carbides, borides, MXenes, and hybrid heterostructures. For each catalyst, key performance indicators are provided, specifically the overpotential (mV) required for hydrogen evolution and the corresponding current density (mA cm⁻²), extracted directly from peer-reviewed literature sources under reported experimental conditions. These raw performance metrics are organized into a structured comparative database to enable cross-material evaluation. In addition to the raw electrocatalytic data, the dataset includes processed results obtained using grey relational analysis (GRA), a multi-criteria decision-making method used to evaluate and rank catalyst performance based on simultaneous optimization of low overpotential and high current density. The processed outputs include normalized deviation sequences, grey relational coefficients, and grey relational grades, which collectively provide a unified performance ranking of all catalysts. All data were systematically extracted from published research articles and standardized for consistency. The dataset is designed to support reproducible benchmarking, comparative analysis, and data-driven screening of HER electrocatalysts.