Three-Dimensional Framework of Graphene Nanomeshes Shell/Co3O4 Synthesized as Superior Bifunctional Electrocatalyst for Zinc−Air Batteries
Three-Dimensional Framework of Graphene Nanomeshes Shell/Co3O4 Synthesized as Superior Bifunctional Electrocatalyst for Zinc−Air Batteries
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石墨烯纳米网-壳/Co3O4 的 3D 框架合成为锌空气电池的优质双功能电催化剂
DOI：
10.1021/acsami.7b13290
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Junzhong Wang
中科院分区：
文献类型：
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作者：
Congwei Wang;Zheng Zhao;Xiaofeng Li;Rui Yan;Jie Wang;Anni Li;Xiaoyong Duan;Junying Wang;Yong Liu;Junzhong Wang
合成耐用且低成本的电催化剂是关键但具有挑战性的。在这里，我们开发了一种一锅热解方法，用于制备杂原子掺杂的分级多孔三维（3D）石墨烯。石墨烯纳米网的大字面片尺寸可以刺激与钴-油酸络合物的快速热处理以形成Co 3 O 4纳米晶体，以及由硼和氮共掺杂的多层石墨烯涂层的原位生长，其中控制加热速率高达600 °C。这种新材料作为双功能电催化剂，在氧还原反应和析氧反应中表现出比商品Pt/C更好的起始电位/半波电位、更大的电流密度、更好的稳定性和更强的甲醇耐受性。将杂原子共掺杂到多孔/弯曲的石墨烯中。在3D多孔壁中的受限纳米晶体提供了所产生的催化活性位点的足够的可达性和理想的质量传输路线，用于对氧的氧化还原反应的优异催化活性。合成的材料基锌空气电池进一步证实了其具有高比容量和较小过电位的上级电解活性。这种一锅热解法显示了以低成本可规模化合成用于金属-空气电池和燃料电池的高性能实用电催化剂的巨大潜力。
The synthesis of durable and low-cost electrocatalyst is crucial but challenging. Here, we developed a onepot pyrolysis approach toward the preparation of heteroatomdoped hierarchical porous three-dimensional (3D) graphene.frameworks decorated with multilayer graphene shell-coated.cobalt oxide nanocrystal. Large literal sheet size of graphene.nanomeshes may stimulate rapid thermolysis with cobalt−.oleate complex to form Co3O4 nanocrystals and in situ growth.of multilayer graphene coating co-doped by boron and.nitrogen with controlling heating rate up to 600 °C. This new material worked as superior bifunctional electrocatalyst on.oxygen reduction reaction and oxygen evolution reaction to commercial Pt/C with better onset potential/half-wave potentials,.larger current density, better stability, and stronger methanol tolerance. The heteroatom co-doping into porous/curved graphene.confined nanocrystals in 3D porous walls provided adequate accessibility of created catalytic active sites and ideal mass transport.route for the excellent catalytic activity on redox reaction of oxygen. The synthesized material-based Zn−air battery further.confirmed its superior electrolytic activity with high specific capacity and smaller overpotential. This one-pot pyrolysis method.shows a great potential of scalable synthesis of high-performance practical electrocatalyst for metal−air batteries and fuel cells at a.low cost.