Nanomaterials Electrochemistry: Insights for Materials Scientists and Electrochemists.

Electrochemistry is a key enabler of modern technology, underpinning materials processing, chemical synthesis, and energy storage and conversion. Electrochemistry requires electrodes─conducting materials to external circuit. However, the actual composition of these electrodes is often far removed from that assumed in electrochemical equations─atomically flat homogeneous surfaces. Electrochemical response of nanomaterials arises from a complex interplay of composition, morphology, structure, defects, and surface properties, coupled with mass transport. Failing to fully account for this complexity can lead to ambiguous interpretations of electrochemical activity and reaction mechanisms, particularly at the nanoscale where apparent activity may reflect measurement and transport artifacts rather than intrinsic material properties. This perspective critically examines common sources of ambiguity that emerge when studying nanostructured and heterogeneous materials in electrochemical environments. Drawing on insights from both materials science and electrochemistry, we highlight how factors such as nanomaterial transformation, impurities, electrode architecture, and transport limitations can complicate mechanistic understanding and hinder reliable comparison across the literature. Particular emphasis is placed on the need for rigorous nanomaterial characterization, careful experimental design, and transparent reporting practices, especially in the context of increasingly data-driven research. At the same time, we show that classical electrochemical models, which assume well-defined and homogeneous molecular systems, are not directly transferable to real, complex nanostructured electrode materials. By outlining practical considerations and conceptual pitfalls, this work aims to support more reliable, reproducible, and meaningful investigations at the crossroad of materials science and electrochemistry, highlighting how the nanoscale introduces challenges that require particularly careful experimental design and interpretation. We hope that electrochemists and materials scientists will learn from each other to move this key field forward.