Nanorods of nitrogen-rich copper MOF in high-performance bifunctional electrocatalysis for oxygen and hydrogen evolution reactions

This work introduces a rapid, cost-effective, and energy-efficient synthesis method for a copper-based metal-organic framework (CuTz-1) catalyst to overcome challenges in oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in alkaline media. Among the electrodes, the CuTz-1/nickel foam (NF) demonstrates superior performance with low overpotentials (142 mV and 82 mV at 10 mA cm⁻² and 20 mA cm⁻²), small Tafel slopes (37.1 mV dec⁻¹ and 51.1 mV dec⁻¹) and high turnover frequency (TOF) value (76 × 10⁻³ s⁻¹ and 0.277 s⁻¹) for OER and HER, respectively. Remarkably, CuTz-1/NF maintains stable electrocatalytic activity over 20 h. The presented gram-scale synthesis approach offers practical applications in water splitting, particularly where manufacturing processes are a concern.