Constructing heterostructures with favorable catalytic activities is crucial for improving the seawater electrolysis.Herein,we report a strongly coupled Pt-W_(2)N heterostructure embedded within porous conductive carb...Constructing heterostructures with favorable catalytic activities is crucial for improving the seawater electrolysis.Herein,we report a strongly coupled Pt-W_(2)N heterostructure embedded within porous conductive carbon nanoflowers(Pt-W_(2)N@C)as a highly efficient and durable cathode electrocatalyst for seawater electrolysis.Through in situ Raman spectroscopy and electrochemical analysis,we elucidate that the Pt-W_(2)N@C system leverages synergistic electronic interactions at the heterointerface to concurrently optimize the adsorption of H^(*)and OH^(*)intermediates while enhancing water dissociation kinetics.The optimized Pt-W_(2)N@C catalyst exhibits superior hydrogen evolution reaction(HER)performance across acidic,neutral,and alkaline electrolytes,achieving overpotentials of 1.2,7,and 32.2 mV,respectively,at 10 mA cm^(-2),significantly outperforming commercial 20 wt%Pt/C benchmarks.Notably,the Pt-W_(2)N@C catalyst exhibits exceptional performance in alkaline seawater electrolysis,achieving ultra-low HER overpotential(163.8 mV at 700 mA cm^(-2))alongside superior chloride tolerance and HER performance under 0.5–2.5 M NaCl.Remarkably,in a practical seawater electrolyzer(Pt-W_(2)N@C||NiFe-layered double hydroxide(LDH)),it requires only 1.992 V to drive 500 mA cm^(-2) while maintaining 95.8%activity retention over 80 h of continuous operation.These findings highlight the advantages of heterostructures and their cooperative effects in designing next-generation electrocatalysts for practical seawater electrolysis.展开更多
基金supported by the National Natural Science Foundation of China (22171287)the Taishan Scholar Project of Shandong Province (tsqn202103046)+1 种基金the Natural Science Foundation of Shandong Province (ZR2024QB076)the Fundamental Research Funds for the Central Universities (24CX07007A and 22CX01002A-1)。
文摘Constructing heterostructures with favorable catalytic activities is crucial for improving the seawater electrolysis.Herein,we report a strongly coupled Pt-W_(2)N heterostructure embedded within porous conductive carbon nanoflowers(Pt-W_(2)N@C)as a highly efficient and durable cathode electrocatalyst for seawater electrolysis.Through in situ Raman spectroscopy and electrochemical analysis,we elucidate that the Pt-W_(2)N@C system leverages synergistic electronic interactions at the heterointerface to concurrently optimize the adsorption of H^(*)and OH^(*)intermediates while enhancing water dissociation kinetics.The optimized Pt-W_(2)N@C catalyst exhibits superior hydrogen evolution reaction(HER)performance across acidic,neutral,and alkaline electrolytes,achieving overpotentials of 1.2,7,and 32.2 mV,respectively,at 10 mA cm^(-2),significantly outperforming commercial 20 wt%Pt/C benchmarks.Notably,the Pt-W_(2)N@C catalyst exhibits exceptional performance in alkaline seawater electrolysis,achieving ultra-low HER overpotential(163.8 mV at 700 mA cm^(-2))alongside superior chloride tolerance and HER performance under 0.5–2.5 M NaCl.Remarkably,in a practical seawater electrolyzer(Pt-W_(2)N@C||NiFe-layered double hydroxide(LDH)),it requires only 1.992 V to drive 500 mA cm^(-2) while maintaining 95.8%activity retention over 80 h of continuous operation.These findings highlight the advantages of heterostructures and their cooperative effects in designing next-generation electrocatalysts for practical seawater electrolysis.
