“…In 2 O 3 [31], NiO [24,26,32,33], SnO/SnO x [34][35][36][37] and b-Ga 2 O 3 [38][39][40]. (ii) Mixed oxides: In 2 O 3 -Ag 2 O [41,42]; (iii) Chromium based oxides: LaCrO 3 [43], Cr 2 O 3 [44,45]; (iv) Ag-, Cu-, Pd-and Pt-based delafossites [46][47][48][49][50][51][52][53][54][55][56]; (v) Layered oxychalcogenides: LaCuOS [57][58][59] and LaCuOSe [60]; (vi) Spinel oxides: NiCo 2 O 4 [61,62], ZnCo 2 O 4 [63,64], ZnIr 2 O 4 [63] and ZnRh 2 O 4 [65,66], etc. ; (vii) Others: SnSeO [67], Ba 2 BiTaO 6 [68], SrCu 2 O 2 [69][70][71], [Cu 2 S 2 ][Sr 3 Sc 2 O 5 ] [72] or La 2/3 Sr 1/ 3 VO 3 [73].…”