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biomass to biochar through pyrolysis is promising for carbon-negative biomass energy. potassium could enhancebiochar formation whereas the difference among potassium agents has not been understood. herein, 13 potassiumagents were adopted, and the product compositions and carbon distributions of slow and intermediatepyrolysis were investigated. results show that neutral agents have a weak influence on the products, while highbasicityagents enhance biochar formation, decrease organics yields, and promote h_2 generation (9-144 cm~3/g)and phenols selectivity (64-79 area%). especially, due to the anion properties, borate and phosphates deviatefrom the basicity tendency; acetate contributes to increasing acetic acid selectivity (up to 43 area%) whileoxidizing agents promote co_2 and h_2o yields. potassium performs obvious enhancement of biochar carbonsequestration, increasing by 2-49 % for intermediate pyrolysis and -8-51 % for slow pyrolysis with biocharcarbon retention reaching 55 % and 77 %, respectively. meanwhile, the thermally unstable phases