In-situ Engineering of Double Phase Interface in Mo/Mo2C Heteronanosheets for Boosted Hydrogen Evolution Reaction
In-situ Engineering of Double Phase Interface in Mo/Mo2C Heteronanosheets for Boosted Hydrogen Evolution Reaction
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Mo/Mo2C异质纳米片双相界面的原位工程促进析氢反应
DOI：
10.1021/acsenergylett.7b01180
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发表时间：
2018
影响因子：
22
通讯作者：
Cheng Hansong
中科院分区：
文献类型：
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作者：
Xiong Jie;Li Jing;Shi Jiawei;Zhang Xinlei;Suen Nian-Tzu;Liu Zhao;Huang Yunjie;Xu Guoxiao;Cai Weiwei;Lei Xinrong;Feng Ligang;Yang Zehui;Huang Liang;Cheng Hansong
通过 NaCl 模板辅助合成路线成功制备了二维 Mo/Mo2C 异质纳米片（Mo/Mo2C-HNS），然后对 MoO3 纳米片进行可控同步还原和碳化，以在酸性和碱性条件下有效催化析氢反应（HER）。原子级薄的Mo/Mo2C-HNS中的Mo物种不仅保证了电子的快速传输，而且还优化了β-Mo2C的电子构型。此外，纳米尺寸丰富的Mo/β-Mo2C异质界面提供了大量额外的异质催化位点。因此，在 0.5 M H2SO4 中驱动电流密度为 10 mA/cm2 的 HER 电催化性能仅 89 mV。引人注目的是，20 小时稳定的计时电流电解以及令人印象深刻的循环稳定性（超过 4000 次扫描的过电位衰减可忽略不计）证明了其在酸性环境中具有相当大的耐用性。这些发现凸显了 Mo/Mo2C-HNS 催化剂作为高效稳定的无贵金属电催化剂的 HER 潜力。
Two-dimensional Mo/Mo2C heteronanosheets (Mo/Mo2C-HNS) were successfully prepared via a NaCl template-assisted synthesis route followed by a controllable simultaneous reduction and carbonization of MoO3nanosheets for efficient hydrogen evolution reaction (HER) catalysis under both acidic and alkaline conditions. The Mo species in the atomically thin Mo/Mo2C-HNS not only guarantees the rapid transport of electrons but also optimizes the electronic configuration of β-Mo2C. Besides, the abundant Mo/β-Mo2C heterointerfaces in nanodimension afford large numbers of additional heterogeneous catalytic sites. HER electrocatalytic performance with overpotential of merely 89 mV to drive a current density of 10 mA/cm2in 0.5 M H2SO4is therefore achieved. Strikingly, stable chronoamperometric electrolysis for 20 h and also an impressive cycling stability with negligible overpotential decay over 4000 sweeps demonstrate its considerable durability in an acidic environment. These findings highlight the promising potential of Mo/Mo2C-HNS catalyst as an efficient and stable noble metal-free electrocatalyst toward the HER.