Abstract
This work investigates the role of ligament gap of NiO mesoporous prepared with different template in the activity of rGO/NiO in alkaline hydrogen evolution reaction. The activity of electrocatalyst was found to be highly dictated by the size of ligament gap rather than surface area. Result showed that rGO/NiO made with KCC-1 exhibited a superior activity due to its large ligament gap, even though its surface area was the smallest. It is believed that the evolved hydrogen gas built-up inside NiO mesoporous bulk structure could increase the internal electrode resistance and decrease overall catalytic activity.
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