Correction to: Nature Materials https://doi.org/10.1038/s41563-018-0170-x, published online 24 September 2018.

In the version of this Article originally published, the y axis of Fig. 1c was incorrectly labelled ‘S (%)’; it should have been ‘–S (%)’. Also, the link for the Supplementary Video was missing from the online version of the Article. These errors have now been corrected.