The rational design of cost-effective,highly efficient,and stable Ru-based electrocatalysts as substitutes for Pt in the hydrogen evolution reaction(HER)is highly desirable and has garnered significant attention.Const...The rational design of cost-effective,highly efficient,and stable Ru-based electrocatalysts as substitutes for Pt in the hydrogen evolution reaction(HER)is highly desirable and has garnered significant attention.Constructing core-shell nanostructures has emerged as an effective approach for regulating the interaction among diverse components,potentially enhancing structural stability and catalytic activity.Herein,we report a facile synthesis of Au@RuNi NWs via the epitaxial growth of a uniform fcc-structured RuNi alloy layer on the surface of ultrathin Au NWs.The prepared Au@RuNi NWs exhibit a remarkable alkaline HER performance with only a 19 mV overpotential to achieve a current density of 10 mA cm^(-2),with a small Tafel slope of 32.63 mV dec^(−1)and outstanding stability.The ultrathin 1D core-shell nanowire structure and the alloying effect of Ni within the fcc-RuNi alloy shell layer facilitate the water dissociation,resulting in accelerated alkaline HER kinetics.This work provides a facile method to rationally design and synthesize core-shell Ru-based electrocatalysts for extraordinary HER performance under alkaline conditions.展开更多
By adjusting various Ru/M （M=Co, Ni） molar ratios, a series of highly dispersed bimetallic RuM alloy nanoparticles （NPs） anchored on MIL-110（Al） have been successfully prepared via a conventional impregnation-re...By adjusting various Ru/M （M=Co, Ni） molar ratios, a series of highly dispersed bimetallic RuM alloy nanoparticles （NPs） anchored on MIL-110（Al） have been successfully prepared via a conventional impregnation-reduction method. And they are first used as heterogeneous catalysts for the dehydrogenation reaction of AB at room temperature. The results reveal that the as-prepared RulCo1@MIL-110 and RulNi1@MIL-110 exhibit the highest catalytic activities in different RuCo and RuNi molar ratios, respectively. It is worthy of note that the turnover frequency （TOF） values of Ru1Co1@MIL-110 and Ru1Ni1@MIL-110 catalysts reached 488.1 and 417.1 mol H2 min-1 （mol Ru）-1 and the activation energies （Ea） are 31.7 and 36.0 k J/tool, respectively. The superior catalytic performance is attributed to the bimetallic synergistic action between Ru and M, uniform distribution of metal NPs as well as bi-functional effect between RuM alloy NPs and MIL-110. Moreover, these catalysts exhibit favorable stability after 5 consecutive cycles for the hydrolysis of AB.展开更多
Highly efficient and stable bifunctional electrocatalysts that can be used for large-current-density electrolysis of alkaline seawater are highly desirable for carbon-neutral economies,but their facile and controllabl...Highly efficient and stable bifunctional electrocatalysts that can be used for large-current-density electrolysis of alkaline seawater are highly desirable for carbon-neutral economies,but their facile and controllable synthesis remains a challenge.Here,self-assembled ultralow Ru,Ni-doped Fe_(2)O_(3) with a lily shaped morphology was synthesized on iron foam(RuNi-Fe_(2)O_(3)/IF)via a facile one-step hydrothermal process,in which the intact lily shaped RuNi-Fe_(2)O_(3)/IF was obtained by adjusting the ratio of Ru/Ni.Benefitting from the Ru/Ni chemical substitution,the as-synthesized RuNi-Fe_(2)O_(3)/IF can act as free-standing dual-function electrodes that are applied to electrocatalysis for the hydrogen evolution(HER)and oxygen evolution reactions(OER)in 1.0 mol L^(-1) KOH,requiring an overpotential of 75.0 mV to drive 100 mA cm^(-2) for HER and 329.0 mV for OER.Moreover,the overall water splitting catalyzed by RuNi-Fe_(2)O_(3)/IF only demands ultralow cell voltages of 1.66 and 1.73 V to drive 100 mA cm^(-2) in 1.0 mol L^(-1) KOH and 1.0 mol L^(-1) KOH seawater electrolytes,respectively.The electrodes show remarkable long-term durability,maintaining current densities exceeding 100 mA cm^(-2) for more than 100 h and thus outperforming the two-electrode system composed of noble catalysts.This work provides an efficient,economical method to synthesize self-standing bifunctional electrodes for large-current-density alkaline seawater electrolysis,which is of significant importance for ecological protection and energy exploitation.展开更多
基金funded by the National Natural Science Foundation of China(22202104,22279062,22232004,32101474,42377249)Natural Science Foundation of Jiangsu Province(BK20220933)+1 种基金Jiangsu Undergraduate Training Program for Innovation and Entrepreneurship(S202210288055)ShuangChuang Doctor Plan of Jiangsu Province(JSSCBS20220273).
文摘The rational design of cost-effective,highly efficient,and stable Ru-based electrocatalysts as substitutes for Pt in the hydrogen evolution reaction(HER)is highly desirable and has garnered significant attention.Constructing core-shell nanostructures has emerged as an effective approach for regulating the interaction among diverse components,potentially enhancing structural stability and catalytic activity.Herein,we report a facile synthesis of Au@RuNi NWs via the epitaxial growth of a uniform fcc-structured RuNi alloy layer on the surface of ultrathin Au NWs.The prepared Au@RuNi NWs exhibit a remarkable alkaline HER performance with only a 19 mV overpotential to achieve a current density of 10 mA cm^(-2),with a small Tafel slope of 32.63 mV dec^(−1)and outstanding stability.The ultrathin 1D core-shell nanowire structure and the alloying effect of Ni within the fcc-RuNi alloy shell layer facilitate the water dissociation,resulting in accelerated alkaline HER kinetics.This work provides a facile method to rationally design and synthesize core-shell Ru-based electrocatalysts for extraordinary HER performance under alkaline conditions.
基金supported by the Natural Science Fund for Creative Research Groups of Hubei Province(No.2014CFA015)Hubei Province Education Office Key Laboratory(No.2016-KL-007)of Chinasupported by the Hubei College Students’Innovation Training Program of China(No.201410512024and No.201510512030)
文摘By adjusting various Ru/M （M=Co, Ni） molar ratios, a series of highly dispersed bimetallic RuM alloy nanoparticles （NPs） anchored on MIL-110（Al） have been successfully prepared via a conventional impregnation-reduction method. And they are first used as heterogeneous catalysts for the dehydrogenation reaction of AB at room temperature. The results reveal that the as-prepared RulCo1@MIL-110 and RulNi1@MIL-110 exhibit the highest catalytic activities in different RuCo and RuNi molar ratios, respectively. It is worthy of note that the turnover frequency （TOF） values of Ru1Co1@MIL-110 and Ru1Ni1@MIL-110 catalysts reached 488.1 and 417.1 mol H2 min-1 （mol Ru）-1 and the activation energies （Ea） are 31.7 and 36.0 k J/tool, respectively. The superior catalytic performance is attributed to the bimetallic synergistic action between Ru and M, uniform distribution of metal NPs as well as bi-functional effect between RuM alloy NPs and MIL-110. Moreover, these catalysts exhibit favorable stability after 5 consecutive cycles for the hydrolysis of AB.
文摘Highly efficient and stable bifunctional electrocatalysts that can be used for large-current-density electrolysis of alkaline seawater are highly desirable for carbon-neutral economies,but their facile and controllable synthesis remains a challenge.Here,self-assembled ultralow Ru,Ni-doped Fe_(2)O_(3) with a lily shaped morphology was synthesized on iron foam(RuNi-Fe_(2)O_(3)/IF)via a facile one-step hydrothermal process,in which the intact lily shaped RuNi-Fe_(2)O_(3)/IF was obtained by adjusting the ratio of Ru/Ni.Benefitting from the Ru/Ni chemical substitution,the as-synthesized RuNi-Fe_(2)O_(3)/IF can act as free-standing dual-function electrodes that are applied to electrocatalysis for the hydrogen evolution(HER)and oxygen evolution reactions(OER)in 1.0 mol L^(-1) KOH,requiring an overpotential of 75.0 mV to drive 100 mA cm^(-2) for HER and 329.0 mV for OER.Moreover,the overall water splitting catalyzed by RuNi-Fe_(2)O_(3)/IF only demands ultralow cell voltages of 1.66 and 1.73 V to drive 100 mA cm^(-2) in 1.0 mol L^(-1) KOH and 1.0 mol L^(-1) KOH seawater electrolytes,respectively.The electrodes show remarkable long-term durability,maintaining current densities exceeding 100 mA cm^(-2) for more than 100 h and thus outperforming the two-electrode system composed of noble catalysts.This work provides an efficient,economical method to synthesize self-standing bifunctional electrodes for large-current-density alkaline seawater electrolysis,which is of significant importance for ecological protection and energy exploitation.
