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the new catalyst achieved 10 mA cm−2 water-splitting current at only 1.51 V for more than 200 h
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Equal to the noble metal catalysts.
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Breaking down metal oxide into tiny particles increases its surface area and exposes lots of ultra-small, interconnected grain boundaries that become active sites for the water-splitting catalytic reaction. This process creates tiny particles that are strongly connected, so the catalyst has very good electrical conductivity and stability.
—Yi Cui
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This nano-scale assembling sounds similar to the way they are assembling miniaturized perovskite solar cells:
Inverse:"Solar Tarps" May Be the Alternative to Expensive Tesla Solar Roofs
So now I guess I need to read Scott Adams blog, in addition to Coffee with Scott Adams on Youtube:
Homes Above, Tunnels Below | Scott Adams' Blog