Impurities stabilise hydrogen caverns in salt - Shijie Zhu; Xuan Wang; Xiao Wang; Xilin Shi; Chunhe Yang; Hang Li; Jiangyu Fang; Yashuai Huang; Hao Tian; Weizheng Bai; Xinxing Wei; Hongling Ma; et al. (Tunnelling and Underground Space Technology, 2026)