External voltage regulates hydrogen and vivianite recovery from fermentation liquid in microbial electrolysis cell equipped with iron anode: Performance and mechanism - Ting Zhao; Zhihong Liu; Zhengtong Guo; Xiaoyun Yin; Wenhai Zhu; Zhangwei He; Wenzong Liu; Xiuping Yue; Aijuan Zhou (Journal of Environmental Management, 2025)