Reducing the Overpotential of Ti64-Based Electrode\nfor Water Splitting by Carbon Insertion and Co<sub>0.8</sub>Ni<sub>0.2</sub>(CO<sub>3</sub>)<sub>0.5</sub>(OH)·0.11H<sub>2</sub>O Depositi

In\nan era where clean energy and sustainability are prioritized,\nwater electrolysis for hydrogen production has become a focus of research.\nTi-6Al-4 V alloy (Ti64) may support the catalyst due to its high mechanical\nstrength, electrical conductivity, and resistance to alkali corrosion.\nHowever, its poor catalyst adhesion limits its application. Herein,\na carbon layer was deposited on Ti64 (Ti64/C), before depositing the\nCo<sub>0.8</sub>Ni<sub>0.2</sub>(CO<sub>3</sub>)<sub>0.5</sub>(OH)·0.11H<sub>2</sub>O (CNCH) nanoneedles. The porous Ti64-H/C/CNCH electrode performs\nexceptionally well in the oxygen evolution reaction, achieving a current\nof 10 mA cm<sup>–2</sup> at an overpotential of 131 mV with\n90% IR compensation. Furthermore, the cell achieves a density of 10\nmA cm<sup>–2</sup> at 1.83 V and slow degradation after 45\nh of continuous operation under overall water-splitting conditions.\nThis study presents a method of fabricating high-performance water\nelectrolysis electrodes by coating the metal surface with a carbon\nlayer under the catalysts.