International Journal of Hydrogen Energy ( IF 8.1 ) Pub Date : 2019-01-31 , DOI: 10.1016/j.ijhydene.2019.01.036
Saisai Yang , Meng Xie , Linlin Chen , Wei Wei , Xiaomeng Lv , Yuanguo Xu , Nabi Ullah , Oluigbo Chidinma Judith , Yusuf Bashir Adegbemiga , Jimin Xie
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An electrocatalyst based on a unique three-dimensional (3D) N-doped porous carbon sheet networks embedded with CoP2 nanoparticles (CoP2@3D-NPC) was synthesized by a facile pyrolysis process as well as an in-situ phosphatization method. The improved CoP2@3D-NPC hybrid materials show excellent electrocatalytic activity toward HER and OER. This material provides a low overpotential of 126 mV at 10 mA cm−2 in 0.5 M H2SO4 and 167 mV at 20 mA cm−2 in 1.0 M KOH for HER with a small Tafel slope value of 59 mV dec−1, respectively. Besides, it is also active for the OER under alkaline conditions. Such a prominent property of the CoP2@3D-NPC electrocatalyst could be attributed to its excellent electrical conductivity of 3D carbon substrate, strong synergistic effect between CoP2 nanoparticles and carbon nanosheet as well as extra active sites created by the N-doped structure.
中文翻译:
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嵌入3D N掺杂的多孔碳中的磷化钴纳米颗粒用于有效的氢气和氧气释放反应
通过简便的热解过程和原位磷酸化方法合成了基于嵌入CoP 2纳米颗粒(CoP 2 @ 3D-NPC)的独特的三维(3D)N掺杂多孔碳片网络的电催化剂。改进的CoP 2 @ 3D-NPC杂化材料对HER和OER具有优异的电催化活性。对于HER,此材料在HER中具有低过电位,在0.5 M H 2 SO 4中在10 mA cm -2下为126 mV,在20 mA cm -2在1.0 M KOH中为167 mV,具有小的Tafel斜率值为59 mV dec -1, 分别。此外,它在碱性条件下对OER也有活性。CoP 2 @ 3D-NPC电催化剂的这种突出性能可归因于其3D碳底物的优异电导率,CoP 2纳米颗粒与碳纳米片之间的强协同作用以及N掺杂结构产生的额外活性位。