Spontaneous anchoring Cl intoα-Co(OH)_(2) as efficient and stable oxygen reduction electrocatalysts for seawater battery  

作　　者：Wang Zheng Xue-Rong Zheng Qi Lu Yan-Hui Cao Yang Wang Hai-Peng Fu Jin-Feng Zhang Yi-Da Deng Wen-Bin Hu 

机构地区：[1]School of Materials Science and Engineering,Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education,Tianjin University,Tianjin 300072,China [2]State Key Laboratory of Marine Resource Utilization in South China Sea,School of Materials Science and Engineering,Hainan University,Haikou 570228,China [3]Key Laboratory of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 110819,China

出　　处：《Rare Metals》2024年第7期3074-3083,共10页稀有金属（英文版）

基　　金：financially supported by the Key Research and Development Project of Hainan Province(No.ZDYF2022GXJS006);the National Natural Science Foundation of China(Nos.52177220 and 52231008)。

摘　　要：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 engineering strategy by spontaneously anchoring Cl~-intoα-Co(OH)_(2) as efficient and stable ORR electrocatalysts,in which the ultrathinα-Co(OH)_(2) nanosheets were synthesized using an ultrafast solution high-temperature shock(SHTS)strategy.The large lattice space(~0.8 nm)of layeredα-Co(OH)_(2) ensured the spontaneously penetration of Cl~-into the lattice structure and replaced part of OH~-to formα-Co(OH)_(2-x)Cl_x.The continuous leaching and compensating of saturated Cl inα-Co(OH)_(2-x)Cl_x could enhance the Cl~-corrosion resistance and modulate electronic structure of Co metallic sites,thus improving the ORR electrocatalytic activity and stability in seawater electrolyte.Theα-Co(OH)_(2-x)Cl_x seawater batteries display superior onset and half-wave potentials of 0.71 and 0.66 V,respectively,which are much better than the counterparts ofα-Co(OH)_(2) and ofβ-Co(OH)_(2) with no Cl~-penetrating and no buffer structure.Theα-Co(OH)_(2-x)Cl_x-based seawater batteries display stable open-circuit potential of 1.69 V and outstanding specific capacity of 1345 mAh·g^(-1).

关 键 词：Seawater battery Oxygen reduction electrocatalyst Solution high-temperature shock Structural buffer engineering 

分 类 号：TQ426[化学工程] TM91[电气工程—电力电子与电力传动]