Water electrolysis for green hydrogen production is important for the global carbon neutrality.The industrialization of this technology requires efficient and durable electrocatalysts under high-current-density(HCD)op...Water electrolysis for green hydrogen production is important for the global carbon neutrality.The industrialization of this technology requires efficient and durable electrocatalysts under high-current-density(HCD)operations.However,the insufficient mass and charge transfer at the various interfaces lead to unsatisfactory HCD activity and durability.Interface engineering is important for designing efficient HCD electrocatalysts.In this perspective,we analyze the processes taking place at three interfaces including the catalyst-substrate,catalyst-electrolyte,and catalyst-gas interfaces,and reveal the correlations between interface interactions and the challenges for HCD electrolysis.We then highlight the development of HCD electrocatalysts that focus on interface engineering using the example of transition metal dichalcogenide based catalysts,which have attracted widespread interests in recent years.Finally,we give an outlook on the development of interface engineering for the industrialization of water electrolysis technology.展开更多
Aiming to design and prepare non-noble metal electrocatalysts for hydrogen production at high current density(HCD),NiCoP@FeNi LDH hierarchical nanosheets were deposited on nickel foam progressively us-ing a hydrotherm...Aiming to design and prepare non-noble metal electrocatalysts for hydrogen production at high current density(HCD),NiCoP@FeNi LDH hierarchical nanosheets were deposited on nickel foam progressively us-ing a hydrothermal-phosphorization-electrodeposition process.For hydrogen evolution reaction(HER)and oxygen evolution reaction(OER),NiCoP@FeNi LDH/NF requires only 195 and 230 mV overpotentials to reach 1000 mA cm−2,respectively.For overall water splitting,only 1.70 V is required at 1000 mA cm−2.This is the largest value for non-noble metal-based electrocatalysts reported so far at HCD.The hierarchi-cal structure exhibits good electron transport capability and the porous-macroporous structure enhances the gas release rate,resulting in enhanced hydrogen production at HCD.Especially,the synergistic effect of NiCoP and FeNi LDH contributes to the adsorption-desorption equilibrium of intermediate radicals dur-ing the reaction process and ultimately enhances the catalytic activity.This work provides useful direction for industrial-scale hydrogen production applications at HCD.展开更多
The giant stress-impedance (GSI) effect in amorphous and current annealed Fe73.5Cu1Nb3Si13.5B9 ribbons has been investigated. The results showed that the GSI effect changed drastically with annealing techniques and th...The giant stress-impedance (GSI) effect in amorphous and current annealed Fe73.5Cu1Nb3Si13.5B9 ribbons has been investigated. The results showed that the GSI effect changed drastically with annealing techniques and the maximum stress impedance ratio of 350% was obtained after optimal conditions of current annealing. The behaviors of the stress impedance vary with densities of annealing current and the stress longitudinally applied during current annealing. The maximum change of stress impedance existed in the sample annealed by high-current-density electropulsing under applied stress of 100 MPa.展开更多
文摘Water electrolysis for green hydrogen production is important for the global carbon neutrality.The industrialization of this technology requires efficient and durable electrocatalysts under high-current-density(HCD)operations.However,the insufficient mass and charge transfer at the various interfaces lead to unsatisfactory HCD activity and durability.Interface engineering is important for designing efficient HCD electrocatalysts.In this perspective,we analyze the processes taking place at three interfaces including the catalyst-substrate,catalyst-electrolyte,and catalyst-gas interfaces,and reveal the correlations between interface interactions and the challenges for HCD electrolysis.We then highlight the development of HCD electrocatalysts that focus on interface engineering using the example of transition metal dichalcogenide based catalysts,which have attracted widespread interests in recent years.Finally,we give an outlook on the development of interface engineering for the industrialization of water electrolysis technology.
基金the National Sci-ence Fund for Distinguished Young Scholars(No.52025041)the National Natural Science Foundation of China(Nos.51974021,51902020,51904021)+3 种基金the Fundamental Research Funds for the Central Universities(Nos.FRF-TP-18-045A1 and FRF-TP-19-004B2Z)the National Postdoctoral Program for Innovative Talents(No.BX20180034)the open foundation of Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials,Guangxi University(No.2021GXYSOF12)the Interdisciplinary Research Project for Young Teachers of USTB(Fundamental Research Funds for the Central Universities)(No.FRF-IDRY-21-028).
文摘Aiming to design and prepare non-noble metal electrocatalysts for hydrogen production at high current density(HCD),NiCoP@FeNi LDH hierarchical nanosheets were deposited on nickel foam progressively us-ing a hydrothermal-phosphorization-electrodeposition process.For hydrogen evolution reaction(HER)and oxygen evolution reaction(OER),NiCoP@FeNi LDH/NF requires only 195 and 230 mV overpotentials to reach 1000 mA cm−2,respectively.For overall water splitting,only 1.70 V is required at 1000 mA cm−2.This is the largest value for non-noble metal-based electrocatalysts reported so far at HCD.The hierarchi-cal structure exhibits good electron transport capability and the porous-macroporous structure enhances the gas release rate,resulting in enhanced hydrogen production at HCD.Especially,the synergistic effect of NiCoP and FeNi LDH contributes to the adsorption-desorption equilibrium of intermediate radicals dur-ing the reaction process and ultimately enhances the catalytic activity.This work provides useful direction for industrial-scale hydrogen production applications at HCD.
基金This work was supported by the National Natural ScienceFoundation of China (Grant No.5017106).
文摘The giant stress-impedance (GSI) effect in amorphous and current annealed Fe73.5Cu1Nb3Si13.5B9 ribbons has been investigated. The results showed that the GSI effect changed drastically with annealing techniques and the maximum stress impedance ratio of 350% was obtained after optimal conditions of current annealing. The behaviors of the stress impedance vary with densities of annealing current and the stress longitudinally applied during current annealing. The maximum change of stress impedance existed in the sample annealed by high-current-density electropulsing under applied stress of 100 MPa.
