Effects of NiCoP with Different Dimension on Hydrogen Evolution Reaction

doi:10.12422/j.issn.1006-396X.2023.02.009

Abstract

Abstract:

Morphology regulation is an important way to improve the performance of electrocatalytic hydrogen evolution reaction. This paper investigated the effect of NiCoP with different dimension on the hydrogen evolution reaction by combining theoretical calculation and experimental analysis methods and constructed structural models of 1D nanowires (NW?NiCoP) and 2D nanosheets (NS?NiCoP).Simulation results show that NW?NiCoP exhibits higher electronic density of electronic states near the Fermi level, which is beneficial to efficient charge transfer. NS?NiCoP features higher hydrogen adsorption energy, which is favorable for the Volmer reaction.NW?NiCoP,NS?NiCoP,and 3D nanosheet?wires (NSW?NiCoP) were prepared by hydrothermal and phosphating processes. Electrochemical tests on NiCoP with different dimension indicate that the overpotential is 45 mV for NSW?NiCoP at -10 mA/cm².

Key words: NiCoP, Morphology regulation, Different dimension, Hydrogen evolution reaction

摘要：

形貌调控是提升电催化析氢反应性能的重要途径。通过理论计算和实验验证相结合的方法，研究了不同维度的NiCoP对析氢反应的影响；构建了一维纳米线（NW?NiCoP）和二维纳米片（NS?NiCoP）的结构模型。结果表明，NW?NiCoP在费米能级附近具有更高的态密度，有利于电荷高效传输，而NS?NiCoP则具有更高的氢吸附能，有利于进行Volmer反应。采用水热和磷化两步法分别制备了NW?NiCoP、NS?NiCoP和三维杂化纳米片线（NSW?NiCoP）；对不同维度的NiCoP进行了电化学测试。结果表明，在电流密度为-10 mA/cm²时，NSW?NiCoP的过电位为45 mV。

关键词: NiCoP, 形貌调控, 不同维度, 析氢反应

CLC Number:

TQ151

Dong Li, Kunyan Wang, Yuqiao Wang. Effects of NiCoP with Different Dimension on Hydrogen Evolution Reaction[J]. Journal of Petrochemical Universities, 2023, 36(2): 70-77.

李东, 王昆彦, 王育乔. 不同维度的NiCoP对析氢反应的影响[J]. 石油化工高等学校学报, 2023, 36(2): 70-77.

Figures/Tables 13

Fig.1 Preparation flow chart of NiCoP with different dimension

Fig.2 Theoretical model after optimization， density of states and adsorption energy of NS?NiCoP and NW?NiCoP

Fig.3 XRD patterns of NiCoP with different dimension

Fig.4 SEM and TEM images of NiCoP with different dimension

Fig.5 XPS profile of NSW?NiCoP

Fig.6 LSV and Tafel curves of NF and NiCoP with different dimension

Table 1 HER activity with other reported catalysts

催化剂	过电位/mV	参考文献
NiCoP	108	[17]
NiCoP	34	[18]
Ni₂P	98	[19]
Co⁃Fe⁃P	86	[7]
MoP	86	[20]
NSW⁃NiCoP	45	本研究

Fig.7 The CV curves of NiCoP with different dimension at different sweep velocities

Fig.8 The Cdl curve of NiCoP with different dimension

Fig.9 The ECSA of NiCoP with different dimension

Fig.10 Charge transfer impedance of NF and NiCoP with different dimension

Table 2 The simulated data from EIS

催化剂	R_s/Ω	R_ct/Ω	催化剂	R_s/Ω	R_ct/Ω
NSW⁃NiCoP	1.38	3.17	NS⁃NiCoP	1.67	3.87
NW⁃NiCoP	2.06	3.30	NF	1.51	6.76

Fig.11 The constant voltage curve and LSV curve of NSW?NiCoP

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