Adsorption and corrosion caused by Cl^(−)are the main reasons for the low performance of Pt-based catalysts for the hydrogen evolution reaction(HER)in seawater.Although the introduction of hydroxyl species is an ideal...Adsorption and corrosion caused by Cl^(−)are the main reasons for the low performance of Pt-based catalysts for the hydrogen evolution reaction(HER)in seawater.Although the introduction of hydroxyl species is an ideal approach to enhance HER kinetics and resist harmful Cl^(−),achieving this goal in Pt-based catalysts is challenging.In this study,we developed a high-temperature reduction process to generate PtNi alloy particles that contain Ni vacancies(Lewis acid sites)that participate in transforming lattice hydroxyls to dissociative hydroxyls on Ni layered double hydroxides(Ni-LDH).The hydroxyls in Ni-LDH bind with Lewis acid active sites to form hydroxyl rich species,a process which enhances the hydrophilicity of PtNi/Ni-LDH to promote water adsorption and enhance resistance to Cl^(−)absorption.Owing to these properties,PtNi/Ni-LDH exhibits superior performance as an electrocatalyst for the HER in alkaline natural seawater as reflected by a low overpotential of 19 mV to drive a current density of 10 mA cm^(−2),a low Tafel slope of 31 mV dec^(−1),and an only slightly elevated overpotential after 100 h of operation.This study throws light on the development of new strategies for the design of high-performance catalysts for hydrogen production by electrolytic seawater splitting.展开更多
基金supported by the Key R&D Program of Shandong Province,China(2023CXGC010314)National Natural Science Foundation of China(52201286)+4 种基金National 111 Project(B20002)Guangdong Basic and Applied Basic Research Foundation(2024A1515012613,2025A1515011773,2025A1515010634)Hubei Provincial Natural Science Foundation of China(2024AFB195)Shenzhen Science and Technology Program(JCYJ20240813103609013)Fundamental Research Funds for the Central Universities(104972025KFYzxk0014,104972024KFYjlb0008).
文摘Adsorption and corrosion caused by Cl^(−)are the main reasons for the low performance of Pt-based catalysts for the hydrogen evolution reaction(HER)in seawater.Although the introduction of hydroxyl species is an ideal approach to enhance HER kinetics and resist harmful Cl^(−),achieving this goal in Pt-based catalysts is challenging.In this study,we developed a high-temperature reduction process to generate PtNi alloy particles that contain Ni vacancies(Lewis acid sites)that participate in transforming lattice hydroxyls to dissociative hydroxyls on Ni layered double hydroxides(Ni-LDH).The hydroxyls in Ni-LDH bind with Lewis acid active sites to form hydroxyl rich species,a process which enhances the hydrophilicity of PtNi/Ni-LDH to promote water adsorption and enhance resistance to Cl^(−)absorption.Owing to these properties,PtNi/Ni-LDH exhibits superior performance as an electrocatalyst for the HER in alkaline natural seawater as reflected by a low overpotential of 19 mV to drive a current density of 10 mA cm^(−2),a low Tafel slope of 31 mV dec^(−1),and an only slightly elevated overpotential after 100 h of operation.This study throws light on the development of new strategies for the design of high-performance catalysts for hydrogen production by electrolytic seawater splitting.
