Operando Insights on the Degradation Mechanisms of Rhenium‐Doped and Undoped Molybdenum Disulfide Nanocatalysts During Hydrogen Evolution Reaction and Open‐Circuit Conditions

• DOI: 10.1002/adfm.202413720
• Publication Date: 2024-08-26T06:19:15Z
• Authors: Raquel Aymerich‐A...; Miquel Vega‐Paredes; Zhenbin Wang; Andrea M. Mingers; Luca Camuti; Jeeung Kim; Jeongwook Bae; Ilias Efthimiopoulos; Rajib Sahu; Filip Podjaski; Martin Rabe; Christina Scheu; Joohyun Lim; Siyuan Zhang
• Keywords: Nanomaterial-based catalyst; Molybdenum disulfide; Degradation

Abstract Molybdenum disulfide (MoS 2) nanostructures are promising catalysts for proton‐exchange‐membrane (PEM) electrolyzers to replace expensive noble metals. Their large‐scale application demands high activity the hydrogen evolution reaction (HER) as well robust durability. Doping is commonly applied enhance HER of MoS 2 ‐based nanocatalysts, but effect dopants on electrochemical and structural stability yet be discussed. Herein, operando measurements materials down nanometric scale correlated by identical location electron microscopy spectroscopy. The range stable operation nanocatalysts with without rhenium doping experimentally defined. responsible degradation mechanisms at first electrolyte contact, open circuit stabilization, conditions identified confirmed calculated Pourbaix diagram Re‐doped . validated a strategy continuing improvement high‐performance durable PEM electrolyzers.