最新糖心Vlog

Researchers have successfully split seawater without pre-treatment to produce green hydrogen.

The international team was led by the 最新糖心Vlog of Adelaide鈥檚 Professor Shizhang Qiao and Associate Professor Yao Zheng from the School of Chemical Engineering.

鈥淲e have split natural seawater into oxygen and hydrogen with nearly 100 per cent efficiency, to produce green hydrogen by electrolysis, using a non-precious and cheap catalyst in a commercial electrolyser,鈥� said Professor Qiao.

A typical non-precious catalyst is cobalt oxide with chromium oxide on its surface.

鈥淲e used seawater as a feedstock without the need for any pre-treatment processes like reverse osmosis desolation, purification, or alkalisation,鈥� said Associate Professor Zheng.

鈥淭he performance of a commercial electrolyser with our catalysts running in seawater is close to the performance of platinum/iridium catalysts running in a feedstock of highly purified deionised water.

Our work provides a solution to directly utilise seawater without pre-treatment systems and alkali addition, which shows similar performance as that of existing metal-based mature pure water electrolyser.The 最新糖心Vlog of Adelaide's Associate Professor Yao Zheng, researcher in the School of Chemical Engineering.

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The team published their research in the journal

鈥淐urrent electrolysers are operated with highly purified water electrolyte. Increased demand for hydrogen to partially or totally replace energy generated by fossil fuels will significantly increase scarcity of increasingly limited freshwater resources,鈥� said Associate Professor Zheng.

Seawater is an almost infinite resource and is considered a natural feedstock electrolyte. This is more practical for regions with long coastlines and abundant sunlight. However, it isn鈥檛 practical for regions where seawater is scarce.

Seawater electrolysis is still in early development compared with pure water electrolysis because of electrode side reactions, and corrosion arising from the complexities of using seawater.

鈥淚t is always necessary to treat impure water to a level of water purity for conventional electrolysers including desalination and deionisation, which increases the operation and maintenance cost of the processes,鈥� said Associate Professor Zheng.

鈥淥ur work provides a solution to directly utilise seawater without pre-treatment systems and alkali addition, which shows similar performance as that of existing metal-based mature pure water electrolyser.鈥�

The team will work on scaling up the system by using a larger electrolyser so that it can be used in commercial processes such as hydrogen generation for fuel cells and ammonia synthesis.