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Phosphine vapor-assisted construction of heterostructured Ni2P/NiTe2 catalysts for efficient hydrogen evolution
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-05-12 , DOI: 10.1039/d0ee00666a Yibing Li 1, 2, 3, 4 , Xin Tan 5, 6, 7, 8, 9 , Hao Tan 10, 11, 12, 13 , Hangjuan Ren 1, 2, 3, 4 , Sheng Chen 1, 2, 3, 4 , Wanfeng Yang 1, 2, 3, 4 , Sean C. Smith 5, 6, 7, 8, 9 , Chuan Zhao 1, 2, 3, 4
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-05-12 , DOI: 10.1039/d0ee00666a Yibing Li 1, 2, 3, 4 , Xin Tan 5, 6, 7, 8, 9 , Hao Tan 10, 11, 12, 13 , Hangjuan Ren 1, 2, 3, 4 , Sheng Chen 1, 2, 3, 4 , Wanfeng Yang 1, 2, 3, 4 , Sean C. Smith 5, 6, 7, 8, 9 , Chuan Zhao 1, 2, 3, 4
Affiliation
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Heterostructured catalysts with unique interfaces and properties endow distinct advantages for many electrochemical reactions. Herein, a phosphine (PH3) vapor-assisted phase and structure engineering strategy is developed for the controllable conversion of non-active NiTe into a heterostructured active Ni2P/NiTe2 catalyst for alkaline hydrogen evolution reaction (HER). The crystalline NiTe2 phase in situ generated in a PH3 vapor environment and the nanosheet morphology both contribute to the outstanding alkaline HER performance with an overpotential of only 62 mV to achieve a current density of −10 mA cm−2. Experimental and DFT mechanistic studies suggest the Ni2P/NiTe2 interfaces provide abundant exposed active sites. The Ni2P/NiTe2 catalyst shows the lowest kinetic barrier for water dissociation and the adsorbed H* can simultaneously bind to two Ni atoms at the interface of Ni2P/NiTe2(011), which greatly enhances the H* binding and HER activities. DFT simulation also shows that more electrons transfer from Ni atoms to H* on Ni2P/NiTe2(011) (0.22 e−) than that on NiTe2(011) (0.13 e−), which explains the enhanced H* binding at the Ni2P/NiTe2(011) interface. The PH3 vapor synthetic approach is also applied to treat other chalcogenide-based materials with low HER activities, such as Ni3S2, to create Ni2P/NiS2 interfaces for significantly enhanced HER activity.
中文翻译：
膦蒸气辅助结构的Ni2P / NiTe2异质结构催化剂可有效释放氢气
具有独特界面和性能的异结构催化剂为许多电化学反应提供了明显的优势。在本文中，开发了一种膦（PH 3）气相辅助相和结构工程策略，用于可控制地将非活性NiTe转化为用于异质结构的活性Ni 2 P / NiTe 2催化剂，以进行碱性氢释放反应（HER）。在PH 3蒸气环境中原位生成的NiNi 2结晶相和纳米片形态都有助于实现出色的碱性HER性能，其过电势仅为62 mV，从而实现了-10 mA cm -2的电流密度。实验和DFT机理研究表明，Ni 2 P / NiTe 2界面提供了大量的暴露活性位点。Ni 2 P / NiTe 2催化剂显示出最低的水离解动力学屏障，吸附的H *可以同时与Ni 2 P / NiTe 2（011）界面上的两个Ni原子结合，从而大大增强了H *的结合和她的活动。DFT仿真还示出了更多的电子从Ni原子至H转移*对Ni 2 P / NITE 2（011）（0.22ë - ）高于上NITE 2（011）（0.13ë - ），这解释了增强的H *结合在Ni 2P / NiTe 2（011）接口。PH 3气相合成方法还用于处理其他具有较低HER活性的硫族化物基材料（例如Ni 3 S 2），以创建Ni 2 P / NiS 2界面以显着增强HER活性。
更新日期：2020-06-19
中文翻译：
膦蒸气辅助结构的Ni2P / NiTe2异质结构催化剂可有效释放氢气
具有独特界面和性能的异结构催化剂为许多电化学反应提供了明显的优势。在本文中，开发了一种膦（PH 3）气相辅助相和结构工程策略，用于可控制地将非活性NiTe转化为用于异质结构的活性Ni 2 P / NiTe 2催化剂，以进行碱性氢释放反应（HER）。在PH 3蒸气环境中原位生成的NiNi 2结晶相和纳米片形态都有助于实现出色的碱性HER性能，其过电势仅为62 mV，从而实现了-10 mA cm -2的电流密度。实验和DFT机理研究表明，Ni 2 P / NiTe 2界面提供了大量的暴露活性位点。Ni 2 P / NiTe 2催化剂显示出最低的水离解动力学屏障，吸附的H *可以同时与Ni 2 P / NiTe 2（011）界面上的两个Ni原子结合，从而大大增强了H *的结合和她的活动。DFT仿真还示出了更多的电子从Ni原子至H转移*对Ni 2 P / NITE 2（011）（0.22ë - ）高于上NITE 2（011）（0.13ë - ），这解释了增强的H *结合在Ni 2P / NiTe 2（011）接口。PH 3气相合成方法还用于处理其他具有较低HER活性的硫族化物基材料（例如Ni 3 S 2），以创建Ni 2 P / NiS 2界面以显着增强HER活性。
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