Manganese-based materials are influenced by the Jahn-Teller effect,causing the spontaneous dismutation of Mn^(3+)(2Mn^(3+)→Mn^(2+)+Mn^(4+))and the dissolution of Mn^(2+),which often results in diminished activity.Thi...Manganese-based materials are influenced by the Jahn-Teller effect,causing the spontaneous dismutation of Mn^(3+)(2Mn^(3+)→Mn^(2+)+Mn^(4+))and the dissolution of Mn^(2+),which often results in diminished activity.This study uniquely employs a W doping strategy to suppress this effect.Externally,a simple template-free method was initially used to prepare cobalt-and manganese-based precursors,followed by a W doping process during the synthesis of transition bimetallic phosphides.Ultimately,W-doped bimetallic phosphides(W-CoMnP)were obtained.The W-CoMnP material demonstrates excellent HER and OER performance with low overpotentials of 95 mV(η_(₁₀)HER)and 225 mV(η_(₅₀)OER),and can achieve overall water splitting at a voltage of 1.52 V while maintaining stable cycling for 24 h.To enable commercial application,W-CoMnP was incorporated into an anion exchange membrane(AEM)electrolysis water device,demonstrating continuous and stable hydrogen production under ambient temperature conditions.This study offers a promising strategy for the future development of catalysts for AEM electrolysis water devices.展开更多
The electronic modulation characteristics of efficient metal phosphide electrocatalysts can be utilized to tune the performance of oxygen evolution reaction(OER).However,improving the overall water splitting performan...The electronic modulation characteristics of efficient metal phosphide electrocatalysts can be utilized to tune the performance of oxygen evolution reaction(OER).However,improving the overall water splitting performance remains a challenging task.By building metal organic framework(MOF)on MOF heterostructures,an efficient strategy for controlling the electrical structure of MOFs was presented in this study.ZIF-67 was in-situ synthesized on MIL-88(Fe)using a two-step self-assembly method,followed by low-temperature phosphorization to ultimately synthesize FeP-CoP_(3)bimetallic phosphides.By combining atomic orbital theory and theoretical calculations(density functional theory),the results reveal the successful modulation of electronic orbitals in FeP-CoP_(3)bimetallic phosphides,which are synthesized from MOF on MOF structure.The synergistic impact of the metal center Co species and the phase conjugation of both kinds of MOFs are responsible for this regulatory phenomenon.Therefore,the catalyst demonstrates excellent properties,demonstrating HER 81 mV(η10)in a 1.0 mol L^(−1)KOH solution and OER 239 mV(η50)low overpotentials.The FeP-CoP_(3)linked dual electrode alkaline batteries,which are bifunctional electrocatalysts,have a good electrocatalytic ability and may last for 50 h.They require just 1.49 V(η50)for total water breakdown.Through this technique,the electrical structure of electrocatalysts may be altered to increase catalytic activity.展开更多
文摘Manganese-based materials are influenced by the Jahn-Teller effect,causing the spontaneous dismutation of Mn^(3+)(2Mn^(3+)→Mn^(2+)+Mn^(4+))and the dissolution of Mn^(2+),which often results in diminished activity.This study uniquely employs a W doping strategy to suppress this effect.Externally,a simple template-free method was initially used to prepare cobalt-and manganese-based precursors,followed by a W doping process during the synthesis of transition bimetallic phosphides.Ultimately,W-doped bimetallic phosphides(W-CoMnP)were obtained.The W-CoMnP material demonstrates excellent HER and OER performance with low overpotentials of 95 mV(η_(₁₀)HER)and 225 mV(η_(₅₀)OER),and can achieve overall water splitting at a voltage of 1.52 V while maintaining stable cycling for 24 h.To enable commercial application,W-CoMnP was incorporated into an anion exchange membrane(AEM)electrolysis water device,demonstrating continuous and stable hydrogen production under ambient temperature conditions.This study offers a promising strategy for the future development of catalysts for AEM electrolysis water devices.
文摘The electronic modulation characteristics of efficient metal phosphide electrocatalysts can be utilized to tune the performance of oxygen evolution reaction(OER).However,improving the overall water splitting performance remains a challenging task.By building metal organic framework(MOF)on MOF heterostructures,an efficient strategy for controlling the electrical structure of MOFs was presented in this study.ZIF-67 was in-situ synthesized on MIL-88(Fe)using a two-step self-assembly method,followed by low-temperature phosphorization to ultimately synthesize FeP-CoP_(3)bimetallic phosphides.By combining atomic orbital theory and theoretical calculations(density functional theory),the results reveal the successful modulation of electronic orbitals in FeP-CoP_(3)bimetallic phosphides,which are synthesized from MOF on MOF structure.The synergistic impact of the metal center Co species and the phase conjugation of both kinds of MOFs are responsible for this regulatory phenomenon.Therefore,the catalyst demonstrates excellent properties,demonstrating HER 81 mV(η10)in a 1.0 mol L^(−1)KOH solution and OER 239 mV(η50)low overpotentials.The FeP-CoP_(3)linked dual electrode alkaline batteries,which are bifunctional electrocatalysts,have a good electrocatalytic ability and may last for 50 h.They require just 1.49 V(η50)for total water breakdown.Through this technique,the electrical structure of electrocatalysts may be altered to increase catalytic activity.
