Hydroxyl-Mediated radical initiation and functional group activation for enhancing the oxidation activity of coal gasification fine Slag: Experimental and DFT study - Qingyun Wang; Xueqin Hai; Yonghui Bai; Peng Lv; Jiaofei Wang; Weiguang Su; Xudong Song; Guanghua Lu; Guangsuo Yu (Fuel, 2026)