首页|Spontaneous anchoring Cl into α-Co(OH)2 as efficient and stable oxygen reduction electrocatalysts for seawater battery
Spontaneous anchoring Cl into α-Co(OH)2 as efficient and stable oxygen reduction electrocatalysts for seawater battery
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Seawater battery is an advanced energy storage system that enables conversion of chemical energy to electricity by consuming metals,dissolved oxygen and seawater in anode,cathode and electrolyte,respectively.However,the oxygen reduction reaction(ORR)activity and stability of electrocatalysts can be easily deactivated due to the severe Cl-permeation and corrosion in seawater electrolyte.Herein,we developed a structural buffer engi-neering strategy by spontaneously anchoring Cl-into α-Co(OH)2 as efficient and stable ORR electrocatalysts,in which the ultrathin α-Co(OH)2 nanosheets were synthe-sized using an ultrafast solution high-temperature shock(SHTS)strategy.The large lattice space(～0.8 nm)of layered α-Co(OH)2 ensured the spontaneously penetration of Cl-into the lattice structure and replaced part of OH-to form α-Co(OH)2-xClx.The continuous leaching and compensating of saturated Cl in α-Co(OH)2-xClx could enhance the Cl-corrosion resistance and modulate elec-tronic structure of Co metallic sites,thus improving the ORR electrocatalytic activity and stability in seawater electrolyte.The α-Co(OH)2-xClx seawater batteries display superior onset and half-wave potentials of 0.71 and 0.66 V,respectively,which are much better than the counterparts of α-Co(OH)2 and of β-Co(OH)2 with no Cl-penetrating and no buffer structure.The α-Co(OH)2-xClx-based sea-water batteries display stable open-circuit potential of 1.69 V and outstanding specific capacity of 1345 mAh·g-1.
Wang Zheng、Xue-Rong Zheng、Qi Lu、Yan-Hui Cao、Yang Wang、Hai-Peng Fu、Jin-Feng Zhang、Yi-Da Deng、Wen-Bin Hu
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School of Materials Science and Engineering,Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education,Tianjin University,Tianjin 300072,China
State Key Laboratory of Marine Resource Utilization in South China Sea,School of Materials Science and Engineering,Hainan University,Haikou 570228,China
Key Laboratory of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 110819,China
Key Research and Development Project of Hainan ProvinceNational Natural Science Foundation of ChinaNational Natural Science Foundation of China
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