单层氧化石墨烯 粉末
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- 货号：100602
- CAS号：7440-44-0
- 包装： 1g
- 保存条件：4℃避光冷藏
- 编号：XF002-2
- 规格：
- 保质期：180 天
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单层氧化石墨烯 片状 经典
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大片径氧化石墨烯片
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| 货号 | CAS号 | 编号 | 包装 | 参数 | 库存 | 补货期 | 价格 |
|---|---|---|---|---|---|---|---|
| 100602 | 7440-44-0 | XF002-2 | 1g | 片径：0.5~5μm厚度:0.8-1.2nm | 97 | 2个工作日 | 登录后查看价格 |
| 100603 | 7440-44-0 | XF002-2 | 500 mg | 片径:0.5~5 μm厚度:0.8- 1.2nm | 102 | 2个工作日 | 登录后查看价格 |
| 103080 | 7440-44-0 | XF002-2 | 10g | 片径:0.5~5 μm厚度:0.8- 1.2nm | 8 | 5个工作日 | 登录后查看价格 |
| 103081 | 7440-44-0 | XF002-2 | 5g | 片径:0.5~5 μm厚度:0.8- 1.2nm | 1 | 2个工作日 | 登录后查看价格 |
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文章内容概述：
在这个工作中，我们以K2[Ni(CN)4]、带正电的SiO2纳米球模板和氧化石墨烯(GO)以及肽菁亚铁(FePc)通过一步一步自组装的方法合成中间体SiO2@[Ni(CN)4]2-@GO@FePc，直接高温裂解中间体并碱洗除去模板后最终得到单原子Ni和单原子Fe分别负载于石墨烯空心球内层和外层的Janus材料Ni-N4/GHSs/Fe-N4。经过研究，石墨烯空心球的直径为150-200 nm，Ni和Fe都以单原子的形式分别负载于石墨烯空心球的内外表面，同步辐射吸收光谱(XAS)表明单原子Ni和Fe都分别与四个N配位。电化学研究表明，外层的Fe-N4组分对ORR具有较高的催化活性，半波电位(E1/2)为0.83 V，内层的Ni-N4组分对OER具有较高的催化活性，过电位(Ej10)为0.39 V，实验结果与理论计算相符。在实用性方面，Ni-N4/GHSs/Fe-N4基锌空电池充放电循环600圈（大约200 h）后，未出现明显衰减，充放电效率保持在52.2%，且比容量和能量密度分别为777.6 mAhgZn-1和970.4 Wh kgZn-1,为理论容量(820 mAhgZn-1)和能量密度(1084 Wh kgZn-1)的94.8%和89.5%，明显优于Pt/C+RuO2基锌空电池（659.6 mAhgZn-1和844.3 Wh kgZn-1）。说明所合成的Janus材料Ni-N4/GHSs/Fe-N4是一种同时有利于ORR和OER的双功能催化剂，实用性上，Ni-N4/GHSs/Fe-N4基锌空电池具有较大的比容量、能量密度，较高的充放电效率以及较好的循环稳定性。
创新点：
通过一步一步自组装的方法，首次将两种不同的电催化活性组分在同一个催化剂中分开，从而形成Janus结构；通过空间限域效应，将具有高OER活性的Ni和具有高ORR活性的Fe以单原子的形式分别锚定在石墨烯层两个不同的表面，并各自表现出优异的ORR和OER活性。在锌空电池测试中所合成的Janus材料表现出优异的循环稳定性，600次循环后充放电效率仍然稳定；较高的比容量和能量密度，分别为理论值的94.8%和89.5%。
产品使用感受：
我们购买的是1000mg/瓶规格的单层氧化石墨烯（XF002-2）用来合成样品。这个产品给我的感受就是氧化石墨烯非常的轻，而且很亲水，容易分散，基本每次都能成功合成样品，形貌也很稳定。之前也用过其他品牌的氧化石墨烯，整体偏灰黑色，便宜许多，但亲水性不好，不易分散，导致很多情况下合成样品的形貌都是塌的，现在实验室都是用的先丰纳米的石墨烯了。
课题组方向：
导师：唐亚文 教授
电催化方向：ORR，OER，HER，MOR，锌空电池，全解水
使用先丰产品发表的文章
Dual Single-Atomic Ni-N4 and Fe-N4 Sites Constructing Janus Hollow Graphene for Selective Oxygen Electrocatalysis，Adv. Mater. 2020, 32, 2003134