Construction of 2D-2D Bi-based double heterojunctions to enhance the electrocatalytic activity of hydrogen evolution and triiodide reduction reactions

【作者】 许晓蓉； Guangping Yang； Tianxiang Yang； Zhiguo Wang； Mengmeng Zhang； Ke Wang； 云斯宁；

【Author】 Xiaorong Xu;Guangping Yang;Tianxiang Yang;Zhiguo Wang;Mengmeng Zhang;Ke Wang;Sining Yun;Functional Materials Laboratory (FML),School of Materials Science and Engineering,Xi’an University of Architecture and Technology;

【机构】 Functional Materials Laboratory (FML),School of Materials Science and Engineering,Xi’an University of Architecture and Technology；

【摘要】 Designing high-efficient bifunction catalysts with excellent catalytic activity and enhanced charge-transfer capability in both alkaline hydrogen evolution reaction （HER） and triiodide reduction reaction （IRR） is of utmost significance to advance the development of green hydrogen production and photovoltaics.Among them,the optimization of electronic structure by constructing heterogeneous interfaces to enhance catalytic activity has attracted wide attention.Herein,we designed a closely integrated bilayer heterojunction ultrathin nanosheet (BiO_2-x/Bi₂MoO₆/Bi₂Se₃),the rational combination of 2D-2D close-packed structures increased the number of effective active sites,the heterojunction structure properties reduced the barrier and promoted charge transfer,significantly improving its electrochemical performance.The 2D-2D BiO_2-x/Bi₂MoO₆/Bi₂Se₃ achieves a low overpotential 94 mV at a current density of 10 mA·cm^-2.The photovoltaic device assembled from the BiO_2-x/Bi₂MoO₆/Bi₂Se₃ delivers a power conversion efficiency of 8.87%.This work provides a feasible strategy for constructing two-dimensional nanosheet catalyst with bilayer heterojunction structures.更多还原

【Abstract】 Designing high-efficient bifunction catalysts with excellent catalytic activity and enhanced charge-transfer capability in both alkaline hydrogen evolution reaction （HER） and triiodide reduction reaction （IRR） is of utmost significance to advance the development of green hydrogen production and photovoltaics.Among them,the optimization of electronic structure by constructing heterogeneous interfaces to enhance catalytic activity has attracted wide attention.Herein,we designed a closely integrated bilayer heterojunction ultrathin nanosheet (BiO_2-x/Bi₂MoO₆/Bi₂Se₃),the rational combination of 2D-2D close-packed structures increased the number of effective active sites,the heterojunction structure properties reduced the barrier and promoted charge transfer,significantly improving its electrochemical performance.The 2D-2D BiO_2-x/Bi₂MoO₆/Bi₂Se₃ achieves a low overpotential 94 mV at a current density of 10 mA·cm^-2.The photovoltaic device assembled from the BiO_2-x/Bi₂MoO₆/Bi₂Se₃ delivers a power conversion efficiency of 8.87%.This work provides a feasible strategy for constructing two-dimensional nanosheet catalyst with bilayer heterojunction structures.更多还原