To acquire the synergy effects between Sn and Cu for the jointly high Faradaic efficiency and current density,we develop a novel strategy to design the Sn-Cu alloy catalyst via a decorated co-electrodeposition method ...To acquire the synergy effects between Sn and Cu for the jointly high Faradaic efficiency and current density,we develop a novel strategy to design the Sn-Cu alloy catalyst via a decorated co-electrodeposition method for CO2 electroreduction to formate.The Sn-Cu alloy shows high formate Faradaic efficiency of 82.3%±2.1% and total C1 products Faradaic efficiency of 90.0%±2.7% at^-1.14 V vs.reversible hydrogen electrode(RHE).The current density and mass activity of formate reach as high as(79.0±0.4)mA cm^-2 and(1490.6±7.5)m A mg^-1 at^-1.14 V vs.RHE.Theoretical calculations suggest that Sn-Cu alloy can obtain high Faradaic efficiency for CO2 electroreduction by suppressing the competitive hydrogen evolution reaction and that the formate formation follows the path of CO2→HCOO*→HCOOH.The stepped(211)surface of Sn-Cu alloy is beneficial towards selective formate production.展开更多
风电场集群并网是抑制风电出力波动的有效手段,根据相关规划要求,输送如此大容量的风电必须采用高压或超高压输电线路,而其无功特性是影响电网电压波动的关键因素,是相关无功规划的重要参考,为此针对集群风电场输电通道无功特性及其对...风电场集群并网是抑制风电出力波动的有效手段,根据相关规划要求,输送如此大容量的风电必须采用高压或超高压输电线路,而其无功特性是影响电网电压波动的关键因素,是相关无功规划的重要参考,为此针对集群风电场输电通道无功特性及其对并网点(point of common coupling,PCC)电压的影响进行探讨。从理论上推导分析了输电通道的无功特性及其对电压的影响,并在PSD-BPA软件中搭建含大规模风电的广东电网模型,结合风电典型日出力特性进行仿真测试。仿真结果验证了相关理论推导,表明在不同出力水平下输电通道和电网的无功交换和风电出力具有近似二次函数的关系,输电通道既能向电网输送无功也能吸收无功,由此引起接入PCC点电压的升降。理论计算和数值仿真结果对大规模风电并网后的无功规划具有一定指导意义。展开更多
基金supported by the National Key R&D Program of China(2017YFA0700102)the National Natural Science Foundation of China(21573222,91545202,21802124,91945302 and 91845103)+6 种基金Dalian National Laboratory for Clean Energy(DNL180404)Dalian Institute of Chemical Physics(DICP DMTO201702)Dalian Outstanding Young Scientist Foundation(2017RJ03)Liaoning Revitalization Talents Program(XLYC1907099)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB17020200)the financial support from CAS Youth Innovation Promotion(2015145)the financial support from the China Postdoctoral Science Foundation(2018M630307 and 2019T120220)。
文摘To acquire the synergy effects between Sn and Cu for the jointly high Faradaic efficiency and current density,we develop a novel strategy to design the Sn-Cu alloy catalyst via a decorated co-electrodeposition method for CO2 electroreduction to formate.The Sn-Cu alloy shows high formate Faradaic efficiency of 82.3%±2.1% and total C1 products Faradaic efficiency of 90.0%±2.7% at^-1.14 V vs.reversible hydrogen electrode(RHE).The current density and mass activity of formate reach as high as(79.0±0.4)mA cm^-2 and(1490.6±7.5)m A mg^-1 at^-1.14 V vs.RHE.Theoretical calculations suggest that Sn-Cu alloy can obtain high Faradaic efficiency for CO2 electroreduction by suppressing the competitive hydrogen evolution reaction and that the formate formation follows the path of CO2→HCOO*→HCOOH.The stepped(211)surface of Sn-Cu alloy is beneficial towards selective formate production.
文摘风电场集群并网是抑制风电出力波动的有效手段,根据相关规划要求,输送如此大容量的风电必须采用高压或超高压输电线路,而其无功特性是影响电网电压波动的关键因素,是相关无功规划的重要参考,为此针对集群风电场输电通道无功特性及其对并网点(point of common coupling,PCC)电压的影响进行探讨。从理论上推导分析了输电通道的无功特性及其对电压的影响,并在PSD-BPA软件中搭建含大规模风电的广东电网模型,结合风电典型日出力特性进行仿真测试。仿真结果验证了相关理论推导,表明在不同出力水平下输电通道和电网的无功交换和风电出力具有近似二次函数的关系,输电通道既能向电网输送无功也能吸收无功,由此引起接入PCC点电压的升降。理论计算和数值仿真结果对大规模风电并网后的无功规划具有一定指导意义。
