New NiO-NiCo Electrode Boosts Clean Hydrogen Production

Making clean hydrogen from water is key to a greener future. Alkaline water electrolysis is a popular method, but it has a big problem. The hydrogen evolution reaction in alkaline conditions is slow. This slows everything down and makes the process less efficient.

Scientists are searching for better materials to speed things up. Nickel-based materials are promising because they are cheap and abundant. But they struggle with one part of the reaction. The Volmer step acts like a bottleneck. It slows the whole process and limits how fast hydrogen can be made.

To fix this, researchers combined two materials. They merged nickel oxide (NiO) with a nickel-cobalt alloy (NiCo). Each material helps in its own way. NiO makes the slow Volmer step faster. NiCo adds more active spots for the reaction to happen. Together, they work better than either one alone.

The new electrode was tested on nickel foam. It performed very well. At a current density of 10 mA per square centimeter, it only needed 22.7 mV of extra voltage. That is a sign of high efficiency. It matched the performance of catalysts that use expensive noble metals.

In a real-world test, the electrode ran at 2.01 volts and 1 amp per square centimeter. That is 262 mV better than a plain nickel foam electrode. The team also tested how stable it was. They turned the current on and off every 30 minutes. After many cycles, the voltage only went up by 13 mV. This shows the electrode stays strong over time.

These findings show that NiO-NiCo electrodes could be a smart choice for industrial hydrogen production. They are efficient, stable, and made from low-cost materials. This could help make clean hydrogen more affordable and widely available.