10.1371/journal.pone.0124228.g002 Wensheng Ning Wensheng Ning Hehong Shen Hehong Shen Yangfu Jin Yangfu Jin Xiazhen Yang Xiazhen Yang Principal scheme of the evaluation apparatus. Public Library of Science 2015 Co 3O particle catalyst surface modification cobalt impregnation Weak Surface Modification 2015-05-04 03:28:41 Figure https://plos.figshare.com/articles/figure/_Principal_scheme_of_the_evaluation_apparatus_/1402956 <p>Principal scheme of the evaluation apparatus.</p>