Microbial formation of palladium nanoparticles by Geobacter sulfurreducens for chromate reduction

► First report on reduction of Pd(II) to Pd(0) nanoparticle by Geobacter strain. ► Bio-Pd(0) with high catalytic activity formed with high CDW:Pd ratio or AQDS. ► Effective Cr(VI) reduction by active bio-Pd(0).