Metallic tin quantum sheets confined in graphene toward high-efficiency carbon dioxide electroreduction.
Metallic tin quantum sheets confined in graphene toward high-efficiency carbon dioxide electroreduction.
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DOI：
10.1038/ncomms12697
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发表时间：
2016-09-02
影响因子：
16.6
通讯作者：
Xie, Yi
中科院分区：
文献类型：
--
作者：
Lei, Fengcai;Liu, Wei;Sun, Yongfu;Xu, Jiaqi;Liu, Katong;Liang, Liang;Yao, Tao;Pan, Bicai;Wei, Shiqiang;Xie, Yi
超薄金属层可以作为高活性的二氧化碳电还原催化剂，但也可能容易发生氧化。本文以合成的石墨烯约束下的高活性锡量子片为例，构建了石墨烯约束下的高活性金属超薄层模型。较高的电化学活性面积确保了相对于大块锡9倍的二氧化碳吸附能力，而高导电性石墨烯有利于从二氧化碳到其自由基阴离子的速率决定电子转移。x射线吸收精细结构光谱显示，降低的锡-锡配位数使限制在石墨烯中的锡量子片能够有效地稳定二氧化碳自由基阴离子，与体锡相比，羟基离子吸附电位降低了0.13伏。因此，限制在石墨烯中的锡量子片表现出增强的电催化活性和稳定性。该研究为设计高效、稳定的电解燃料合成催化剂提供了新的思路。超薄金属层可以是高活性的二氧化碳电还原催化剂，但也可能容易氧化。在这里，作者报告了在石墨烯中制备活性锡量子纳米片的方法，并证明了其增强的电催化活性和稳定性。
Ultrathin metal layers can be highly active carbon dioxide electroreduction catalysts, but may also be prone to oxidation. Here we construct a model of graphene confined ultrathin layers of highly reactive metals, taking the synthetic highly reactive tin quantum sheets confined in graphene as an example. The higher electrochemical active area ensures 9 times larger carbon dioxide adsorption capacity relative to bulk tin, while the highly-conductive graphene favours rate-determining electron transfer from carbon dioxide to its radical anion. The lowered tin–tin coordination numbers, revealed by X-ray absorption fine structure spectroscopy, enable tin quantum sheets confined in graphene to efficiently stabilize the carbon dioxide radical anion, verified by 0.13 volts lowered potential of hydroxyl ion adsorption compared with bulk tin. Hence, the tin quantum sheets confined in graphene show enhanced electrocatalytic activity and stability. This work may provide a promising lead for designing efficient and robust catalysts for electrolytic fuel synthesis. Ultrathin metal layers can be highly active carbon dioxide electroreduction catalysts but may also be prone to oxidation. Here, the authors report the fabrication of reactive tin quantum nanosheets confined in graphene and demonstrate their enhanced electrocatalytic activity and stability.
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影响因子：
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作者：
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通讯作者：
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作者：
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影响因子：
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作者：
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通讯作者：
Xie, Yi
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作者：
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通讯作者：
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影响因子：
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作者：
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