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Triple Ni-Co-Mo metal sulfides with one-dimensional and hierarchical nanostructures towards highly efficient hydrogen evolution reaction
Journal of Catalysis ( IF 7.3 ) Pub Date : 2018-03-19 , DOI: 10.1016/j.jcat.2018.03.004
Zi-Zhang Liu , Xiao Shang , Bin Dong , Yong-Ming Chai

Designing multi-transition metal-based sulfides holds promising in alkaline water electrolysis, whereas selecting proper candidates and facile building strategy remain challengeable. Herein, based on previous theory of combining 3d-transition metal (NiCo) with non-3d-transition metal (Mo) to lower hydrogen-adsorption energy barriers, we develop an indirect access to NiCoMo sulfides supported by nickel foam (CoMoO-S/NF) with one dimensional (1 D) and hierarchical nanostructures. In the first step, the metal oxides as precursor frameworks are designed as one-dimensional (1 D) nanostructures comprising interwoven nanosheets. The unique structure not only provides the large surface areas for exposing abundant active sites, but also improves the contact between catalyst/interface and facilitates the mass or charge transportation. Besides, the ternary metals are supposed to generate synergistic effect to boost hydrogen evolution reaction (HER) properties of CoMoO-S/NF via sulfurization in the second step. Furthermore, CoMoO-S/NF demonstrates high electrocatalytic performances with structural stability in long-term HER process. Therefore, the two-step building of ternary transition metal sulfides may be provide applications for various transition metal materials with unique architecture and high efficiency in alkaline HER.



中文翻译:

具有一维和分级纳米结构的三重Ni-Co-Mo金属硫化物,可实现高效的氢气释放反应

设计多过渡金属基硫化物在碱性水电解中具有广阔的前景,而选择合适的候选物和简便的构建策略仍然具有挑战性。在此,根据先前将3d过渡金属(NiCo)与非3d过渡金属(Mo)结合以降低氢吸附能垒的理论,我们开发了一种间接获得由镍泡沫支撑的NiCoMo硫化物的方法(CoMoO-S / NF)具有一维(1 D)和分层纳米结构。在第一步中,将作为前体骨架的金属氧​​化物设计为包含交织纳米片的一维(1D)纳米结构。独特的结构不仅提供了用于暴露大量活性位的大表面积,而且还改善了催化剂/界面之间的接触并促进了质量或电荷的传输。除了,在第二步中,三元金属应该产生协同作用,以通过硫化提高CoMoO-S / NF的析氢反应(HER)性能。此外,CoMoO-S / NF在长期HER过程中表现出高的电催化性能和结构稳定性。因此,三步过渡金属硫化物的两步构建可以为具有独特结构和在碱性HER中的高效率的各种过渡金属材料提供应用。

更新日期:2018-03-19
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