Enhancing biochar steam gasification via frequency-tuned microwave heating for efficient CO2-to-CO conversion - Xinru La; Haolin Liu; Wei Liao; Xi Lin; Bingqing Shi; Yunjuan Sun; Jurong Ren; Lingming Xiong; Shule Wang; Jia Wang; Jianchun Jiang (Biomass and Bioenergy, 2026)