Reverse Micelle Synthesis of Au_yNi_100‐y Nanoparticles Decorated Multiwalled Carbon Nanotubes as High‐Performance Anode Electrocatalysts for Direct Borohydride‐Hydrogen Peroxide Fuel Cells

Cost‐effective and efficient electrocatalysts for the borohydride oxidation reaction (BOR) are essential for improving the performance of direct borohydride‐hydrogen peroxide fuel cells (DBHPFCs). In this work, AuNi nanoparticles decorated multiwalled carbon nanotubes (MWCNT) (AuNi/MWCNT) were synthesized via a reverse micelle method using sodium bis(2‐ethylhexyl) sulfosuccinate at 303 K and applied as anode electrocatalysts for DBHPFCs. Various physicochemical and electrochemical characterization techniques were employed. Among the synthesized catalysts, Au₅₀Ni₅₀/MWCNT demonstrated superior performance, including a higher electrochemically active surface area (ECSA: 923 cm² mg⁻¹), turnover frequency (TOF: 0.21 s⁻¹), peak current density (73 mA cm⁻²), lower activation energy (7.4 kJ mol⁻¹), exchanged electron number (5.8), lower charge transfer resistance (47.66 ohms), highest stability, and the lowest poisoning rate (0.14 10⁻³% s⁻¹) compared to Au₁₀₀/MWCNT and others. DBHPFCs constructed with Au₅₀Ni₅₀/MWCNT as the anode and a Pt mesh (1 cm × 1 cm) as the cathode achieved a peak power density of 67.11 mW cm⁻² and a current density of 70 mA cm⁻² at 303 K. The exceptional electrocatalytic performance of the AuNi/MWCNT electrocatalyst offers valuable insights for developing innovative, cost‐effective, and durable electrocatalysts for DBHPFC applications.