Doping-induced structural phase transition in cobalt diselenide enables enhanced hydrogen evolution catalysis.
Doping-induced structural phase transition in cobalt diselenide enables enhanced hydrogen evolution catalysis.
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二硒化钴中掺杂诱导的结构相变能够增强析氢催化
DOI：
10.1038/s41467-018-04954-7
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发表时间：
2018-06-28
影响因子：
16.6
通讯作者：
Yu SH
中科院分区：
文献类型：
--
作者：
Zheng YR;Wu P;Gao MR;Zhang XL;Gao FY;Ju HX;Wu R;Gao Q;You R;Huang WX;Liu SJ;Hu SW;Zhu J;Li Z;Yu SH
过渡金属二卤化物材料已被广泛用作催化析氢反应的催化剂，但它们的热力学成本往往很高。尽管激活策略，如缺陷和合成工程，已经导致了显著的活动增加，但针对实际设备应用，仍然需要更好的性能。本文报道了在CoSe_2中磷掺杂引起的从立方相到正交相的相变。结果表明，添加适量的磷(8 wt%)得到的正交晶CoSe2在10 mA cm 2 in 1−M KOH下的过电势最低，为104 mV，起始电势为31 mV。该催化剂在运行20 h后，活性衰减可以忽略不计。这种显著的催化性能可以归因于这种掺杂诱导的结构相变策略所创造的良好的电子结构和局部配位环境。
Transition metal dichalcogenide materials have been explored extensively as catalysts to negotiate the hydrogen evolution reaction, but they often run at a large excess thermodynamic cost. Although activating strategies, such as defects and composition engineering, have led to remarkable activity gains, there remains the requirement for better performance that aims for real device applications. We report here a phosphorus-doping-induced phase transition from cubic to orthorhombic phases in CoSe2. It has been found that the achieved orthorhombic CoSe2with appropriate phosphorus dopant (8 wt%) needs the lowest overpotential of 104 mV at 10 mA cm−2in 1 M KOH, with onset potential as small as −31 mV. This catalyst demonstrates negligible activity decay after 20 h of operation. The striking catalysis performance can be attributed to the favorable electronic structure and local coordination environment created by this doping-induced structural phase transition strategy.
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影响因子：
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作者：
Li, Yanguang;Wang, Hailiang;Dai, Hongjie
通讯作者：
Dai, Hongjie
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作者：
Hinnemann, B;Moses, PG;Norskov, JK
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