CN111569855A - Zif-8/c60复合物衍生非金属电催化剂的制备方法 - Google Patents
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- 239000013154 zeolitic imidazolate framework-8 Substances 0.000 title claims abstract description 71
- MFLKDEMTKSVIBK-UHFFFAOYSA-N zinc;2-methylimidazol-3-ide Chemical compound [Zn+2].CC1=NC=C[N-]1.CC1=NC=C[N-]1 MFLKDEMTKSVIBK-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 239000010411 electrocatalyst Substances 0.000 title claims abstract description 21
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- 238000000034 method Methods 0.000 title abstract description 10
- XMWRBQBLMFGWIX-UHFFFAOYSA-N C60 fullerene Chemical compound C12=C3C(C4=C56)=C7C8=C5C5=C9C%10=C6C6=C4C1=C1C4=C6C6=C%10C%10=C9C9=C%11C5=C8C5=C8C7=C3C3=C7C2=C1C1=C2C4=C6C4=C%10C6=C9C9=C%11C5=C5C8=C3C3=C7C1=C1C2=C4C6=C2C9=C5C3=C12 XMWRBQBLMFGWIX-UHFFFAOYSA-N 0.000 claims abstract description 20
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- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 238000006555 catalytic reaction Methods 0.000 abstract 1
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 40
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- HTXDPTMKBJXEOW-UHFFFAOYSA-N iridium(IV) oxide Inorganic materials O=[Ir]=O HTXDPTMKBJXEOW-UHFFFAOYSA-N 0.000 description 1
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Abstract
ZIF‑8/C60复合物衍生非金属电催化剂的制备方法。本发明采用共沉淀法将沸石咪唑酯(ZIF‑8)与富勒烯C60进行复合,成功制备了ZIF‑8/C60复合物,产物经1000℃煅烧获得了多孔碳材料ZIF‑8/C60‑C,研究了该催化剂在碱性电解水析氧反应中的催化性能。结果表明,相比于ZIF‑8‑C和ZIF‑8/C60,ZIF‑8/C60‑C具有最小的析氧过电位,当电流密度为10mA cm‑2时,其所需过电位仅为0.42V。富勒烯的引入不仅可以改善复合材料的导电性,还可以增大了ZIF‑8/C60‑C的电化学活性面积,暴露更多的活性位点,证明富勒烯在制备ZIF‑8/C60‑C复合电催化剂中具有重要的协同催化效应。
Description
技术领域
本发明属于电化学领域,尤其涉及一种电解水析氧催化剂材料的制备方法,具体涉及一种ZIF-8/C60复合物衍生非金属电催化剂的制备方法。
背景技术
随着能源危机和环境问题的日益突出,开发清洁、无污染的新型可再生能源成为当今社会被广泛关注的热点问题。氢气由于其能量密度高、环境友好的特点被认为是可再生能源的首选。从技术角度而言,氢气可通过电解水获取。电解水过程分为阳极析氧反应(OER)和阴极析氢反应(HER)两个半反应。目前,析氧反应严重依赖于成本高昂的贵金属催化剂,如IrO2,RuO等,这极大地限制了电解水技术的大规模应用。因此,开发廉价高效的阳极析氧反应催化剂具有重要的研究价值。
沸石咪唑酯类框架结构(ZIFs)是一种典型的多孔聚合物,具有孔隙可调、比表面积大、稳定性好等特点。ZIFs材料通过碳化处理或与其他纳米材料进行复合可以获得结构多样、性能可控的多级结构,在能源存储、光电催化、生物医药等领域广泛应用。清华大学李亚栋课题组报道了一种由ZIF-8@ZIF-67衍生化而来的氮掺杂碳纳米管包覆CoP核壳结构,碳纳米管与CoP之间的快速电荷转移有效提升了该复合材料的电化学性能,使其成为高效的电解水产氢、产氧双功能催化剂。中国科技大学杨上峰课题组利用球磨法将富勒烯C60嵌入到ZIF-8的三维孔道内,碳化后发现富勒烯碳笼有效扩大了ZIF-8衍生而来的多孔碳的孔道,这为锂离子的输运提供了有利条件,使其成为一种新型的锂离子电池负极材料。
发明内容
本发明的目的在于提供一种简单易行的共沉淀法制备ZIF-8/C60复合物衍生非金属电催化剂的方法,所制备的产物表现出优异的电解水析氧性能,在10mAcm-2电流密度时析氧过电位仅0.42V,并且表现出良好的循环稳定性。
为达到上述目的,本发明采用的技术方案是:
1)ZIF-8/C60前驱体的制备:
1-1)首先,将2-5mmol的二甲基咪唑、1-2mmol的Zn(NO3)2·6H2O和8-12mL的DMF混合均匀配制为A溶液;
1-2)然后,将80-120mg的富勒烯(C60)加入到8-12mL的DMF中超声充分溶解,配制为B溶液;
1-3)最后,将A溶液逐滴滴入B溶液中,室温下搅拌,反应完成后离心洗涤,干燥后得到ZIF-8/C60前驱体;
2)ZIF-8/C60碳化处理
取80-120mg的ZIF-8/C60前驱体放入管式炉中,在氮气保护下以5-10℃/min的升温速率自室温升温至1000℃,保温1-3小时后随炉冷却至室温得到ZIF-8/C60-C复合物衍生非金属电催化剂。
所述步骤1-2)超声时间为20-30分钟。
所述步骤1-3)搅拌时间为24-48h。
所述步骤1-3)离心洗涤采用DMF、乙醇各洗三次。
本发明采用简单易行的共沉淀法,以氮,氮-二甲基甲酰胺(DMF)为溶剂,一步法制备了ZIF-8/C60纳米复合材料,研究发现,溶剂对形成复合材料具有重要影响,碳化处理后所得多孔碳材料表现出优异的电解水析氧性能,在10mA cm-2电流密度时析氧过电位仅0.42V,并且表现出良好的循环稳定性。
有益的效果
本发明首次采用共沉淀法将沸石咪唑酯(ZIF-8)与富勒烯C60进行复合,成功制备了ZIF-8/C60复合物,产物经1000℃煅烧获得了多孔碳材料ZIF-8/C60-C,研究了该催化剂在碱性电解水析氧反应中的催化性能。结果表明,相比于ZIF-8-C和ZIF-8/C60,ZIF-8/C60-C具有最小的析氧过电位,当电流密度为10mA cm-2时,其所需过电位仅为0.42V。富勒烯的引入不仅可以改善复合材料的导电性,还可以增大了ZIF-8/C60-C的电化学活性面积,暴露更多的活性位点,证明富勒烯在制备ZIF-8/C60-C复合电催化剂中具有重要的协同催化效应。
附图说明
图1是本发明实施例1制备的ZIF-8/C60-C电催化剂与ZIF-8,C60,ZIF-8/C60,ZIF-8-C的X射线衍射(XRD)图谱。
图2是本发明实施例1制备的ZIF-8,ZIF-8/C60,ZIF-8/C60-C电催化剂的扫描电镜(SEM)照片。
图3是本发明实施例1制备的ZIF-8,ZIF-8/C60,ZIF-8/C60-C电催化剂在1.0MKOH条件下析氢氧反应的线性扫描伏安(LSV)性能测试图。
具体实施方式:
实施例1:
1)ZIF-8/C60前驱体的制备:
1-1)首先,将4mmol的二甲基咪唑、1.2mmol的Zn(NO3)2·6H2O和10mL的DMF混合均匀配制为A溶液;
1-2)然后,将100mg的富勒烯(C60)加入到10mL的DMF中超声30分钟充分溶解,配制为B溶液;
1-3)最后,将A溶液逐滴滴入B溶液中,室温下搅拌24h,反应完成后采用DMF、和乙醇各离心洗涤三次,干燥后得到ZIF-8/C60前驱体;
2)ZIF-8/C60碳化处理
取100mg的ZIF-8/C60前驱体放入管式炉中,在氮气保护下以10℃/min的升温速率自室温升温至1000℃,保温2小时后随炉冷却至室温得到ZIF-8/C60-C复合物衍生非金属电催化剂。
ZIF-8-C的制备方法除了不加入富勒烯,其他与ZIF-8/C60-C相同。
从图1中可以清晰地看到,ZIF-8与C60复合后表现出较好结晶性,图1中左图ZIF-8/C60的2θ位于10.87°、17.73°、20.81°、21.70°的衍射峰归属于C60的(111)、(022)、(113)、(222)晶面(JCPDS 96-901-1074)。值得注意的是,这几个衍射峰相比于C60的衍射峰都出现了微小的右移,说明C60分子与ZIF-8之间存在晶格相互作用。图1中右图可以看出,ZIF-8/C60-C和ZIF-8-C均无明显的衍射峰,只在22°附件出现一个大包峰,说明碳化处理后样品转变为无定形碳。
从图2(a)可以看出,ZIF-8为微米级别的多面体晶粒。当与富勒烯原位复合后,晶粒尺寸变小,变成几百纳米的颗粒(图2(b)),图2(c)为碳化后所得ZIF-8/C60-C电催化剂的SEM照片,可以看出高温煅烧后晶粒尺寸明显变小,约为50-100nm。
从图3中可以看出,碳化处理后所得多孔碳材料表现出优异的电解水析氧性能,在10mA cm-2电流密度时析氧过电位仅0.42V。
实施例2:
1)ZIF-8/C60前驱体的制备:
1-1)首先,将2mmol的二甲基咪唑、1mmol的Zn(NO3)2·6H2O和9mL的DMF混合均匀配制为A溶液;
1-2)然后,将80mg的富勒烯(C60)加入到9mL的DMF中超声20分钟充分溶解,配制为B溶液;
1-3)最后,将A溶液逐滴滴入B溶液中,室温下搅拌36h,反应完成后采用DMF、和乙醇各离心洗涤三次,干燥后得到ZIF-8/C60前驱体;
2)ZIF-8/C60碳化处理
取90mg的ZIF-8/C60前驱体放入管式炉中,在氮气保护下以8℃/min的升温速率自室温升温至1000℃,保温1小时后随炉冷却至室温得到ZIF-8/C60-C复合物衍生非金属电催化剂。
实施例3:
1)ZIF-8/C60前驱体的制备:
1-1)首先,将5mmol的二甲基咪唑、1.8mmol的Zn(NO3)2·6H2O和8mL的DMF混合均匀配制为A溶液;
1-2)然后,将120mg的富勒烯(C60)加入到12mL的DMF中超声23分钟充分溶解,配制为B溶液;
1-3)最后,将A溶液逐滴滴入B溶液中,室温下搅拌48h,反应完成后采用DMF、和乙醇各离心洗涤三次,干燥后得到ZIF-8/C60前驱体;
2)ZIF-8/C60碳化处理
取110mg的ZIF-8/C60前驱体放入管式炉中,在氮气保护下以5℃/min的升温速率自室温升温至1000℃,保温3小时后随炉冷却至室温得到ZIF-8/C60-C复合物衍生非金属电催化剂。
实施例4:
1)ZIF-8/C60前驱体的制备:
1-1)首先,将3mmol的二甲基咪唑、2mmol的Zn(NO3)2·6H2O和12mL的DMF混合均匀配制为A溶液;
1-2)然后,将110mg的富勒烯(C60)加入到8mL的DMF中超声28分钟充分溶解,配制为B溶液;
1-3)最后,将A溶液逐滴滴入B溶液中,室温下搅拌40h,反应完成后采用DMF、和乙醇各离心洗涤三次,干燥后得到ZIF-8/C60前驱体;
2)ZIF-8/C60碳化处理
取120mg的ZIF-8/C60前驱体放入管式炉中,在氮气保护下以6℃/min的升温速率自室温升温至1000℃,保温2小时后随炉冷却至室温得到ZIF-8/C60-C复合物衍生非金属电催化剂。
Claims (4)
1.ZIF-8/C60复合物衍生非金属电催化剂的制备方法,其特征在于:
1)ZIF-8/C60前驱体的制备:
1-1)首先,将2-5mmol的二甲基咪唑、1-2mmol的Zn(NO3)2·6H2O和8-12mL的DMF混合均匀配制为A溶液;
1-2)然后,将80-120mg的富勒烯(C60)加入到8-12mL的DMF中超声充分溶解,配制为B溶液;
1-3)最后,将A溶液逐滴滴入B溶液中,室温下搅拌,反应完成后离心洗涤,干燥后得到ZIF-8/C60前驱体;
2)ZIF-8/C60碳化处理
取80-120mg的ZIF-8/C60前驱体放入管式炉中,在氮气保护下以5-10℃/min的升温速率自室温升温至1000℃,保温1-3小时后随炉冷却至室温得到ZIF-8/C60-C复合物衍生非金属电催化剂。
2.根据权利要求1所述的ZIF-8/C60复合物衍生非金属电催化剂的制备方法,其特征在于:所述步骤1-2)超声时间为20-30分钟。
3.根据权利要求1所述的ZIF-8/C60复合物衍生非金属电催化剂的制备方法,其特征在于:所述步骤1-3)搅拌时间为24-48h。
4.根据权利要求1所述的ZIF-8/C60复合物衍生非金属电催化剂的制备方法,其特征在于:所述步骤1-3)离心洗涤采用DMF、乙醇各洗三次。
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