Interfacial electron modulation of 3D nanoblock nitrogen-modified carbon with binary metal selenide heterojunctions as stable and efficient electrode materials for advanced energy conversion devices

【作者】 杨天翔； Guangping Yang； Haijiang Yang； Zhiguo Wang； Ruoming Wang； Rou Feng； 云斯宁；

【Author】 Tianxiang Yang;Guangping Yang;Haijiang Yang;Zhiguo Wang;Ruoming Wang;Rou Feng;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】 Facilitating rapid carrier transport through interfacial electron modulation and nanostructure construction is an effective strategy for achieving efficient and stable carbonbased electrode materials,but still poses significant challenges.Here,we successfully prepared two 3D nanoblock-like binary metal selenide composite nitrogen-modified carbons,CoSe₂/FeSe₂@NC and NiSe₂/FeSe₂@NC,by utilizing different metal-based Prussian blue analogs as sacrificial templates.The unique 3D nanoblock morphology of the composites,as well as the electron-rich field generated by the self-driven transfer of electrons at the heterogeneous interface of the binary selenides,significantly facilitated the transport and extraction of electrons and holes,and reduced the energy loss.As a result,when employed as cathode materials for hydrogen evolution reaction,CoSe₂/FeSe₂@NC and NiSe₂/FeSe₂@NC demonstrated low overpotentials of only 64 mV and 80 mV,respectively.Furthermore,when CoSe₂/FeSe₂@NC and NiSe₂/FeSe₂@NC were used as counter electrodes of dye-sensitized solar cell,power conversion efficiencies （PCE） of 8.09%and7.92 were obtained,respectively.Similarly,in hole-transport-layer-free carbon-based perovskite solar cells,CoSe₂/FeSe₂@NC and NiSe₂/FeSe₂@NC achieve PCE of 10.05%and9.97%,respectively.This research provides both theoretical and experimental support for the development of highly efficient and stable carbon-based heterojunction electrode for new energy conversion devices.更多还原

【Abstract】 Facilitating rapid carrier transport through interfacial electron modulation and nanostructure construction is an effective strategy for achieving efficient and stable carbonbased electrode materials,but still poses significant challenges.Here,we successfully prepared two 3D nanoblock-like binary metal selenide composite nitrogen-modified carbons,CoSe₂/FeSe₂@NC and NiSe₂/FeSe₂@NC,by utilizing different metal-based Prussian blue analogs as sacrificial templates.The unique 3D nanoblock morphology of the composites,as well as the electron-rich field generated by the self-driven transfer of electrons at the heterogeneous interface of the binary selenides,significantly facilitated the transport and extraction of electrons and holes,and reduced the energy loss.As a result,when employed as cathode materials for hydrogen evolution reaction,CoSe₂/FeSe₂@NC and NiSe₂/FeSe₂@NC demonstrated low overpotentials of only 64 mV and 80 mV,respectively.Furthermore,when CoSe₂/FeSe₂@NC and NiSe₂/FeSe₂@NC were used as counter electrodes of dye-sensitized solar cell,power conversion efficiencies （PCE） of 8.09%and7.92 were obtained,respectively.Similarly,in hole-transport-layer-free carbon-based perovskite solar cells,CoSe₂/FeSe₂@NC and NiSe₂/FeSe₂@NC achieve PCE of 10.05%and9.97%,respectively.This research provides both theoretical and experimental support for the development of highly efficient and stable carbon-based heterojunction electrode for new energy conversion devices.更多还原