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Tailoring the nanostructure and electronic configuration of metal phosphides for efficient electrocatalytic oxygen evolution reactions
Nano Energy ( IF 17.6 ) Pub Date : 2020-01-07 , DOI: 10.1016/j.nanoen.2020.104453
Changshui Wang , Weibin Chen , Ding Yuan , Shangshu Qian , Dandan Cai , Juantao Jiang , Shanqing Zhang

The enhancement of mass transport and electronic conductivity by nanostructure and electronic configuration tailoring is an efficient strategy to improve electrocatalytic activity and stability for oxygen evolution reactions (OER), and remains a significant challenge to practical applications. Herein, oxygen-incorporated nickel-cobalt phosphide/nitrogen-doped carbon (denoted as NiCoPO/NC) nanosheets were controllably synthesized by utilizing zeolitic imidazolate framework-67 (ZIF-67) as the precursor. This precursor can generate Ni-Co layered double hydroxide/2-methylimidazole (Ni-Co LDH/MeIM) after chemical etching. A subsequent phosphorization process leads to the formation of NiCoPO/NC nanosheets, which possess both nitrogen-doped carbon and incorporated P/O elements in the hybrid structure. As expected, due to the resulting structural and compositional characteristics, the NiCoPO/NC nanosheets exhibit superior electrocatalytic activity with an overpotential of 300 mV at 10 mA cm-2 and excellent long-term stability, comparable to commercial RuO2 and NiCoPO/NC nanocages. The facile and controllable synthetic method paves the way for synthesis of other two-dimensional nanomaterials for energy and environment-related applications.



中文翻译:

量身定制金属磷化物的纳米结构和电子构型,以进行有效的电催化氧释放反应

通过纳米结构和电子构型调整来提高质量传输和电子电导率是提高电催化活性和氧释放反应(OER)稳定性的有效策略,并且仍然是对实际应用的重大挑战。在此,以咪唑类沸石骨架67(ZIF-67)为前体,可控制地合成了氧结合的磷化镍钴/氮掺杂碳(表示为NiCoPO / NC)纳米片。该前体可以在化学蚀刻后产生Ni-Co层状双氢氧化物/ 2-甲基咪唑(Ni-Co LDH / MeIM)。随后的磷化过程导致形成NiCoPO / NC纳米片,该片同时具有氮掺杂碳和杂化结构中掺入的P / O元素。不出所料-2和出色的长期稳定性,可与商业RuO 2和NiCoPO / NC纳米笼媲美。简便且可控的合成方法为能源和环境相关应用的其他二维纳米材料的合成铺平了道路。

更新日期:2020-01-07
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