Oxalic acid-induced assembly of CoxNi1−x-bimetallic polyaniline nanocomposite: a bifunctional material for supercapacitor and chromium removal applications Karkuzhali Rajendran, Manoj Shanmugasundaram, Diana Marcelin Arulanandhu, Gopalakrishnan Gopu, G. Paruthimal Kalaignan, Byong-Hun Jeon, Muthu Prabhu Subbaiah*, 10.1007/s40097-021-00425-6 XML