Catalyst regeneration enables durable hydrogen production from ammonia (IMAGE)
Caption
Figure: (a) Microscopy images showing platinum nanoparticles and individual iron atoms distributed across the catalyst's carbon-based support. Scale bars: 100 nm (left), 50 nm (middle panels) and 2 nm (right). (b) Comparison of ammonia oxidation activity between the new catalyst (Pt/Fe-NC) and a commercial platinum catalyst (Pt/C). (c) The catalyst's design helps prevent platinum oxidation and regenerate sites blocked by nitrogen. (d) Periodic switching of electrical conditions helps restore catalyst activity, while (e) acid washing removes accumulated nitrogen to enable further regeneration. (f–g) The combined regeneration strategy, involving periodic electrical switching, acid washing and ammonia replenishment, sustained hydrogen production for over 2,000 hours at a lower current density and 500 hours at a higher current density, respectively.
Credit
Nature Synthesis
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