FeS_2/rGO的可控制备及其电催化析氢特性
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摘要
为了获得较好的电催化析氢性能,将粒径尺寸约为20 nm的FeS_2纳米粒子与还原氧化石墨烯(rGO)进行复合,制备了FeS_2/rGO复合材料。分散性较好的FeS_2作为析氢反应的催化活性中心促进了H_2的生成;而导电性优异的rGO则提升了电子输运能力,正是这种有效协同作用的发挥,进一步提高了电催化析氢性能。通过优化FeS_2与rGO的投料比,在10 mA/cm~2处的过电位为130 mV。与此同时,FeS_2/rGO复合材料在酸性条件下展现出较为优异的电化学稳定性。因此,可控制备的FeS_2/rGO复合材料是一种有应用前景的析氢电催化剂。
In order to achieve better electrocatalytic hydrogen evolution performance, FeS_2/rGO composite was prepared by combining FeS_2 nanoparticles with particle size of about 20 nm with rGO. FeS_2 with better dispersibility as the catalytic active center of hydrogen evolution reaction promoted the formation of H_2, while rGO with excellent conductivity enhanced the electron transport capacity. Enhanced the electrocatalytic hydrogen evolution performance was mainly attributed to the positively synergistic effect. The optimal overpotential at 10 mA/cm~2 is 130 mV by optimizing the ratio of FeS_2 to rGO. Meanwhile, FeS_2/rGO composite exhibited superior electrochemical stability under acidic conditions. Therefore, the controllably prepared FeS_2/rGO composite is an promising hydrogen evolution electrocatalyst.
In order to achieve better electrocatalytic hydrogen evolution performance, FeS_2/rGO composite was prepared by combining FeS_2 nanoparticles with particle size of about 20 nm with rGO. FeS_2 with better dispersibility as the catalytic active center of hydrogen evolution reaction promoted the formation of H_2, while rGO with excellent conductivity enhanced the electron transport capacity. Enhanced the electrocatalytic hydrogen evolution performance was mainly attributed to the positively synergistic effect. The optimal overpotential at 10 mA/cm~2 is 130 mV by optimizing the ratio of FeS_2 to rGO. Meanwhile, FeS_2/rGO composite exhibited superior electrochemical stability under acidic conditions. Therefore, the controllably prepared FeS_2/rGO composite is an promising hydrogen evolution electrocatalyst.
引文
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[2]Hinnemann B,Moses P G,Bonde J.Biomimetic hydrogen evolution:MoS2nanoparticles as catalyst for hydrogen evolution[J].J.Am.Chem.Soc.,2005,127(15):5308-5309.
[3]王建慧,范成博,翟亚超,等.MeLon/偶氮二苯胺聚合物光催化剂氢性能研究[J].黑龙江大学工程学报,2018,9(4):36-41.
[4]Jaramillo T F,Jrgensen K P,Bonde J.Identification of active edge sites for electrochemical H2evolution from MoS2nanocatalysts[J].Science,2007,317(5834):100-102.
[5]Voiry D,Yamaguchi H,Li J.Enhanced catalytic activity in strained chemically exfoliated WS2nanosheets for hydrogen evolution[J].Nat.Mater.,2013,12(9):850-855.
[6]Faber M S,Lukowski M A,Ding Q.Earth-abundant metal pyrites(Fe S2,Co S2,Ni S2,and their alloys)for highly efficient hydrogen evolution and polysulfide reduction electrocatalysis[J].J.Phy.Chem.C,2014,118(37):21347-21356.
[7]Lukowski M A,Daniel A S,Meng F.Enhanced hydrogen evolution catalysis from chemically exfoliated metallic MoS2nanosheets[J].J.Am.Chem.Soc.,2013,135(28):10274-10277.
[8]Yu B B,Zhang X,Jiang Y,et al.Solvent-induced oriented attachment growth of air-stable phase-pure pyrite Fe S2nanocrystals[J].J.Am.Chem.Soc.,2015,137(6):2211-2214.
[9]Jasion D,Barforoush J M,Qiao Q,et al.Low-dimensional hyperthin Fe S2nanostructures for efficient and stable hydrogen evolution electrocatalysis.ACS Catal.,2015,5(11):6653-6657.
[10]张袆.铁基化合物的可控制备及电催化特征[D].哈尔滨:黑龙江大学,2017.