For practical industrial applications, developing electrocatalysts that can maintain low overpotentials and extend operational durations at high current densities is essential. For instance, the U.S. Department of Energy (DOE) has set an aggressive target for protonexchange-membrane water electrolysis , including a high current density of 3 A cm -2 and a degradation rate of 0.13% over 1,000 h. HER conducted in acidic electrolytes is more efficient than alkaline electrolysis because of its higher energy efficiency, greater achievable current densities, and reduced gas crossover . Despite these advantages, critical challenges still exist in designing efficient catalysts for HER in acidic electrolytes at high current densities: 1) Poor long-term stability. The corrosive environment of strong acids, combined with the heat and mechanical stresses from hydrogen (H2) bubble generation at high current densities, severely challenges the stability of existing catalysts, including those noble metal-based ones .