Mo2C@NC@MoSx porous nanospheres with sandwich shell based on MoO42--polymer precursor for efficient hydrogen evolution in both acidic and alkaline media
Mo2C@NC@MoSx porous nanospheres with sandwich shell based on MoO42--polymer precursor for efficient hydrogen evolution in both acidic and alkaline media
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基于MoO42的具有夹层壳的Mo2C@NC@MoSx多孔纳米球——在酸性和碱性介质中高效析氢的聚合物前体
DOI：
10.1016/j.carbon.2017.09.027
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发表时间：
2017-11
期刊：
影响因子：
10.9
通讯作者：
Liu Chen-Guang
中科院分区：
文献类型：
--
作者：
Chi Jing-Qi;Shang Xiao;Lu Shan-Shan;Dong Bin;Liu Zi-Zhang;Yan Kai-Li;Gao Wen-Kun;Chai Yong-Ming;Liu Chen-Guang
合成了具有夹层壳的Mo2C@NC@MoSx多孔纳米球，可在酸性和碱性介质中有效析氢。首先，以MoO42--/苯胺-吡咯（MoO42--聚合物）为前驱体，通过碳化，得到了以超细Mo2C纳米晶为核、超薄氮掺杂碳（NC）为壳的多孔MoO2-Mo2C@NC纳米球。其次，通过水热硫化合成了具有夹层壳的Mo2C@NC@MoSx多孔纳米球，并通过XPS和HRTEM证实。夹层壳由超薄MoSx、NC层和Mo2C纳米晶组成，可以降低纯Mo2C的强Mosingle bondH键能，从而获得适合HER的ΔGH*。此外，由于丰富的N掺杂，超薄NC可以防止活性位点的聚集并提高电荷转移率。 Mo2C@NC@MoSx在酸性和碱性溶液中均表现出增强的性能和长期耐久性。它在酸性溶液中需要 119 mV 的低起始电位、56 mV dec−1 的塔菲尔斜率，在碱性溶液中需要 86 mV 的起始电位、90 mV dec−1 的塔菲尔斜率。因此，设计具有更好导电性和优化Mosingle bondH键能的夹层纳米结构可能是优异的钼基HER电催化剂的一个有前途的策略。
Mo2C@NC@MoSxporous nanospheres with sandwich shell have been synthesized for efficient hydrogen evolution in both acidic and alkaline media. Firstly, porous MoO2-Mo2C@NC nanospheres have been obtained with ultrafine Mo2C nanocrystallines as core and ultrathin N-doped carbon (NC) as shell through the carbonization of MoO42--/aniline-pyrrole (MoO42--Polymer) as precursor. Secondly, Mo2C@NC@MoSxporous nanospheres with sandwich shell have been synthesized by hydrothermal sulfurization, which can be confirmed by XPS and HRTEM. The sandwich shell is composed of ultrathin MoSx, NC layer and Mo2C nanocrystallines, which may reduce the strong Mosingle bondH bonding energy of pure Mo2C and lead to the suitable ΔGH*for HER. In addition, the ultrathin NC can prevent the aggregation of active sites and improve charge transfer rate due to rich N-doping. Mo2C@NC@MoSxexhibits enhanced performance and long-time durability in both acidic and alkaline solution. It requires a low onsetpotential of 119 mV, Tafel slope of 56 mV dec−1in acidic solution and onsetpotential of 86 mV, Tafel slope of 90 mV dec−1in alkaline solution. Therefore, designing sandwich nanostructure with better conductivity and optimized Mosingle bondH bonding energy may be a promising strategy for excellent Mo-based HER electrocatalysts.
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DOI：
10.1021/acscatal.5b01803
发表时间：
2015-10
期刊：
ACS Catal.
影响因子：
--
作者：
Chengkang Qi;Dezun Zhang;Zhuangzhi Wu;Dezhi Wang
通讯作者：
Dezhi Wang
MoS2纳米片/Mo2C嵌入N掺杂碳纳米管：合成和电催化析氢性能
影响因子：
11.9
作者：
Yu, Hailong;Chen, Yujin;Gao, Peng;Zhu, Chunling
通讯作者：
Zhu, Chunling
影响因子：
15
作者：
Li, Yanguang;Wang, Hailiang;Dai, Hongjie
通讯作者：
Dai, Hongjie
影响因子：
12.9
作者：
Chua, Xing Juan;Luxa, Jan;Pumera, Martin
通讯作者：
Pumera, Martin
影响因子：
15
作者：
Li, Guoqing;Zhang, Du;Cao, Linyou
通讯作者：
Cao, Linyou