Face mask-derived Ni, N-doped graphene sheets for electrocatalytic CO(2)-to-CO reduction

The COVID-19 pandemic that is still prevalent around the globe each day consumes massive disposable face masks and consequently lays a heavy burden on waste management. Meanwhile, the incineration of these medical wastes further escalates the already overwhelming carbon emission that leads to global warming and climate change. To offer a potential solution addressing medical waste and CO(2) emission challenges, we herein develop a synthetic protocol to upgrade face masks into Ni, N-doped graphene (Ni–N-C) sheet catalysts for selectively reducing CO(2) into CO electrochemically. The high specific surface area and the uniform dispersion of Ni active sites of the catalyst derived from a regular disposable face mask enable a near-unity CO Faradaic efficiency (FE) at the current density of 200 mA cm(−2). This study offers outside-of-the-box thinking to address environmental issues by turning medical wastes into CO(2) reduction catalysts. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s10008-023-05444-7.