1. Institute of Physical Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
2. UK Biochar Research Centre, School of Geosciences; University of Edinburgh; Edinburgh United Kingdom
3. Faculty of Materials Science and Engineering; Warsaw University of Technology; Woloska 141 02-507 Warsaw Poland
4. Institute of Electronic Materials Technology; Wolczynska 133 01-919 Warsaw Poland