Non-noble transition metal oxides(TMOs)are promising catalysts with improved catalytic activity and stability in oxygen evolution reaction(OER).However,the structural complexity of TMO-based electrocatalysts renders t...Non-noble transition metal oxides(TMOs)are promising catalysts with improved catalytic activity and stability in oxygen evolution reaction(OER).However,the structural complexity of TMO-based electrocatalysts renders the determination of the active sites and OER mechanisms challenging.Here,we demonstrate that the OER activity of Co-doped one-dimensional W_(18)O_(49)(Co-W_(18)O_(49))is intrinsically dominated by the surface structure and electronic properties of the octahedral sites and Co-O-W bonds.Compared with RuO_(2) and W_(18)O_(49) heterogeneous electrocatalysts,Co-W_(18)O_(49) exhibits higher turnover frequency,attaining 1.97 s−1 at 500 mV overpotential.The results indicate that Co substitution contributes to the localized charge distribution of the active octahedral sites constructed by the Co-O-W bonds under OER conditions.Here,we determine the mechanism of TMOs for the OER,which may be applied to various other TMOs for OER electrocatalyst design.展开更多
W_(18)O_(49)nanowires(W_(18)O_(49)NWs)with unique one-dimension structures and excellent electron/ions transport properties have attracted increasing attention in academia and industry because of their potential appli...W_(18)O_(49)nanowires(W_(18)O_(49)NWs)with unique one-dimension structures and excellent electron/ions transport properties have attracted increasing attention in academia and industry because of their potential applications in many energy-related devices.In the past decades,many research articles related to W_(18)O_(49)have been published,but there are insufficient review articles focusing on W_(18)O_(49)NWs.In this review,we present the crystal structure of W_(18)O_(49)and briefly introduce the synthesis methods and growth mechanism of W_(18)O_(49)NWs.Moreover,their applications in energy conversion and storage devices are summarized.Finally,the current challenges and opportunities for applying W_(18)O_(49)NWs are provided.We hope this review can promote the development of W_(18)O_(49)NWs in energy conversion,storage,and other promising applications.展开更多
Platinum-based material is the most efficient and durable electrocatalyst for motivating the hydrogen evolution reaction(HER)in an acidic electrolyte;however,its low abundance and high cost limit its further applicati...Platinum-based material is the most efficient and durable electrocatalyst for motivating the hydrogen evolution reaction(HER)in an acidic electrolyte;however,its low abundance and high cost limit its further application in proton-exchange membrane water electrolysis(PEMWE)technology.Therefore,minimizing the Pt amount while retaining high activity would be desirable.Herein,we use defect-rich W_(18)O_(49)nanowires to anchor well-dispersed,ultrafine Pt species(Pt-W_(18)O_(49))via a freeze-drying method to avoid aggregation,further mediating an efficient and durable HER in acidic water.Density functional theory analyses also demonstrate that the strong electronic interaction between the Pt species and W_(18)O_(49)support greatly improves the HER performance.With a 1/10 Pt loading amount of the commercial 20 wt%Pt/C,the Pt-W_(18)O_(49)catalyst requires the overpotentials of 116 and 743 mV to achieve high current densities of 100 and 1000 mA cm^(−2)in 0.5 mol L^(−1)H_(2)SO_(4),outperforming those of the 20 wt%Pt/C benchmark.More importantly,the Pt-W_(18)O_(49)catalyst can sustain a high-currentdensity HER at 500 mA cm^(−2)for more than 38 h without obvious degradation.This work paves a new avenue for synergistically reducing the Pt amount and retaining high activity for real-world PEMWE.展开更多
基金support from the Natural Science Foundation of China as a general project(Grant Nos.21874099,22006029,22076082,and 22176140)Frontiers Science Center for New Organic Matter(Grant No.63181206)the Tianjin Commission of Science and Technology as a Key Technology Research and Develop-ment project(Grant Nos.19YFZCSF00740 and 20YFZCSN01070).
文摘Non-noble transition metal oxides(TMOs)are promising catalysts with improved catalytic activity and stability in oxygen evolution reaction(OER).However,the structural complexity of TMO-based electrocatalysts renders the determination of the active sites and OER mechanisms challenging.Here,we demonstrate that the OER activity of Co-doped one-dimensional W_(18)O_(49)(Co-W_(18)O_(49))is intrinsically dominated by the surface structure and electronic properties of the octahedral sites and Co-O-W bonds.Compared with RuO_(2) and W_(18)O_(49) heterogeneous electrocatalysts,Co-W_(18)O_(49) exhibits higher turnover frequency,attaining 1.97 s−1 at 500 mV overpotential.The results indicate that Co substitution contributes to the localized charge distribution of the active octahedral sites constructed by the Co-O-W bonds under OER conditions.Here,we determine the mechanism of TMOs for the OER,which may be applied to various other TMOs for OER electrocatalyst design.
基金Financial support from the National Natural Science Foundation(No.22075151)of Chinathe Natural Science Foundation of Jiangxi(No.20161BBE50095)the project of Jiangxi Academy of Sciences(No.2022YSBG21019 and No.2023YJC2018)is gratefully acknowledged。
文摘W_(18)O_(49)nanowires(W_(18)O_(49)NWs)with unique one-dimension structures and excellent electron/ions transport properties have attracted increasing attention in academia and industry because of their potential applications in many energy-related devices.In the past decades,many research articles related to W_(18)O_(49)have been published,but there are insufficient review articles focusing on W_(18)O_(49)NWs.In this review,we present the crystal structure of W_(18)O_(49)and briefly introduce the synthesis methods and growth mechanism of W_(18)O_(49)NWs.Moreover,their applications in energy conversion and storage devices are summarized.Finally,the current challenges and opportunities for applying W_(18)O_(49)NWs are provided.We hope this review can promote the development of W_(18)O_(49)NWs in energy conversion,storage,and other promising applications.
基金the National Natural Science Foundation of China(21866028)the Development and Innovation Program of Bingtuan(2012QY13)+1 种基金the Program of Science and Technology Innovation Team in Bingtuan(2020CB006)the Achievement Transformation and Technique Popularization Project of Shihezi University(CGZH201910).
文摘Platinum-based material is the most efficient and durable electrocatalyst for motivating the hydrogen evolution reaction(HER)in an acidic electrolyte;however,its low abundance and high cost limit its further application in proton-exchange membrane water electrolysis(PEMWE)technology.Therefore,minimizing the Pt amount while retaining high activity would be desirable.Herein,we use defect-rich W_(18)O_(49)nanowires to anchor well-dispersed,ultrafine Pt species(Pt-W_(18)O_(49))via a freeze-drying method to avoid aggregation,further mediating an efficient and durable HER in acidic water.Density functional theory analyses also demonstrate that the strong electronic interaction between the Pt species and W_(18)O_(49)support greatly improves the HER performance.With a 1/10 Pt loading amount of the commercial 20 wt%Pt/C,the Pt-W_(18)O_(49)catalyst requires the overpotentials of 116 and 743 mV to achieve high current densities of 100 and 1000 mA cm^(−2)in 0.5 mol L^(−1)H_(2)SO_(4),outperforming those of the 20 wt%Pt/C benchmark.More importantly,the Pt-W_(18)O_(49)catalyst can sustain a high-currentdensity HER at 500 mA cm^(−2)for more than 38 h without obvious degradation.This work paves a new avenue for synergistically reducing the Pt amount and retaining high activity for real-world PEMWE.
