Jo, Hyun-gi Lee, Eoyoon Han, Seulki Lim, Jaehong Jeong, Minji Hwang, Jinyeon Lim, Hee-Dae Kim, Hyung-Seok Ham, Hyung Chul Oh, Si Hyoung 2024-01-19T09:02:09Z 2024-01-19T09:02:09Z 2023-08-24 2023-08 2405-8297 https://pubs.kist.re.kr/handle/201004/113415 Long-term operation of aqueous Zn-ion batteries causes Zn metal corrosion at the anode due to the thermodynamic instability of Zn in aqueous electrolytes, leading to significant hydrogen (H2) accumulation, which seriously endangers battery safety. Herein, we propose a self-regulating battery based on internal electrolyteregeneration mechanisms that control H2 production/annihilation reactions automatically and effectively suppress the pressure increase and electrolyte depletion within the cell. This is accomplished by activating a waterregenerating chemical reaction between MnO2 on the cathode and H2 via a Pd catalyst, which significantly relieves the reaction's endothermicity. By electrochemically charging the cell, the resultant Mn2+ and Zn2+ ions in the electrolyte can be easily reversed to their original chemical states, i.e., MnO2 and Zn metal on the cathode and anode, respectively. This new strategy overcomes the safety challenge posed by H2 accumulation, which is one of the key hurdles to the commercialization of aqueous rechargeable batteries. English Elsevier BV Highly safe aqueous rechargeable batteries via electrolyte regeneration using Pd-MnO2 catalytic cycle Article 10.1016/j.ensm.2023.102881 1 Energy Storage Materials, v.61 Energy Storage Materials 61 N scie scopus 001042633500001 2-s2.0-85164986407 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article GENERALIZED GRADIENT APPROXIMATION ION BATTERY ZINC CORROSION CATHODE ELECTRODEPOSITION PERFORMANCE BIRNESSITE STABILITY MAGNESIUM Electrolyte regeneration Aqueous rechargeable battery H2 evolution Pd catalyst MnO2