['We', 'expected', 'that', 'by', 'co', '-', 'grafting', 'of', 'both', 'co', '-', 'catalysts', 'for', 'separations', 'of', 'electrons', 'and', 'holes', ',', 'photocatalytic', 'activity', 'in', 'gaseous', 'phase', 'would', 'be', 'further', 'enhanced', '.']