Research Progress and Hotspots Analysis of Photocatalytic Overall Water Splitting Based on Bibliometric Analysis

The photocatalytic overall water splitting represents a critical and challenging aspect within the field of photocatalysis, having witnessed substantial scientific progress over the past decade. Nevertheless, systematic bibliometric analyses of its developmental trajectories remain scarce. A comprehensive, in‐depth examination—encompassing evolving research focus, influential scholars, and the broader landscape of advancement—is therefore imperative to provide robust, evidence‐based guidance for future investigations. We collected relevant literature on photocatalytic overall water splitting indexed in the Web of Science Core Collection between 2015 and 2025. Using CiteSpace software, this approach enabled us to pinpoint current thematic hotspots and leading contributors in the field. Furthermore, we performed focused case studies on four representative photocatalytic materials—TiO 2 , C 3 N 4 , SrTiO 3 , and BiVO 4 —to quantitatively assess their publication outputs, author contributions, institutional collaborations, and cocitation patterns. These analyses collectively illuminate prevailing research emphases and emerging directions in photocatalytic water‐splitting material design and optimization. By integrating advanced bibliometric methodologies with domain‐specific scholarly insight, this study establishes a methodologically sound framework for literature synthesis and knowledge mapping in overall photocatalytic water splitting. The findings offer a novel, data‐informed perspective on the state and trajectory of photocatalytic overall water splitting research—and thereby support its accelerated scientific and technological advancement.