Bimetallic nickel-cobalt oxalate as highly efficient electrocatalyst for oxygen evolution reaction
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摘要: 开发用于析氧反应(OER)的高性能非贵金属催化剂有望提高电解水制氢的效率,促进氢能的开发利用。本研究采用简便的一步溶剂热法在泡沫镍(NF)上原位生长NiC2O4-Co(草酸镍钴)双金属电催化剂,可应用于高效的析氧反应。在1 mol/L KOH溶液中,自支撑NiC2O4-Co1双金属催化剂在10 mA/cm2下的析氧过电位仅为278 mV,塔菲尔斜率为65 mV/dec,并显现出优异稳定的OER性能。NiC2O4-Co双金属催化剂优异的性能归因于优化的电子结构,增大的比表面积,快速的界面电荷转移能力,以及OER过程中Ni位点和Co位点之间的协同效应。Abstract: Developing highly active and non-noble-metal electrocatalyst for oxygen evolution reaction (OER) is expected to accomplish efficient water splitting hydrogen production and promote the commercial utilization of hydrogen energy. We in-situ fabricated bimetallic NiC2O4-Co electrocatalyst on nickel foam (NF) by a facile one-step solvothermal method in this work. NiC2O4-Co1 self-supported electrocatalyst presents superb OER performance with a low overpotential of 278 mV at 10 mA/cm2 and a Tafel slope of 65 mV/dec, accompanied by excellent stability in 1 mol/L KOH electrolyte. The superior catalytic activity of bimetallic NiC2O4-Co electrocatalyst is attributed to optimized electronic structure, high specific surface area, rapid interfacial charge transfer and the synergistic effect between Ni sites and Co sites during OER process.
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Key words:
- bi-metal /
- oxalate /
- electrocatalyst /
- oxygen evolution reaction
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图 5 NiC2O4、NiC2O4-Co0.5、NiC2O4-Co1和NiC2O4-Co2电极的(a)LSV极化曲线,(b)Tafel曲线,(c)电化学阻抗图谱(0.65 V vs. Hg/HgO,插图是等效电路图),(d)NiC2O4-Co0.5和NiC2O4-Co1在50 mA/cm2下极化18 h的电位-时间曲线
Figure 5 (a) LSV curves, (b) Tafel plots and (c) Nyquist plots (recorded at 0.65 V vs. Hg/HgO, inset: the equivalent circuit model) of NiC2O4, NiC2O4-Co0.5, NiC2O4-Co1 and NiC2O4-Co2 electrodes, (d) Chronopotentiometric curves of NiC2O4-Co0.5 and NiC2O4-Co1 electrodes at 50 mA/cm2 for 18 h
图 6 (a)−(d)NiC2O4、NiC2O4-Co0.5、NiC2O4-Co1和NiC2O4-Co2电极在不同扫描速率下的CV曲线,(e)电位窗口中间的电容电流与扫描速率的关系,(f)−(g)NiC2O4和NiC2O4-Co1的氮气吸附-脱附等温曲线,(h)−(i)NiC2O4和NiC2O4-Co1的孔径分布
Figure 6 (a)−(d) CVs of NiC2O4, NiC2O4-Co0.5, NiC2O4-Co1 and NiC2O4-Co2 at different scan rates, (e) current density as a function of the scan rate for the different electrodes, (f)−(g) N2 adsorption-desorption isotherm of NiC2O4 and NiC2O4-Co1, (h)–(i) BJH adsorption pore size distribution of NiC2O4 and NiC2O4-Co1
表 1 NiC2O4-Co1催化剂和已报道的非贵金属基电催化剂的OER活性对比
Table 1 Comparison of OER performance of NiC2O4-Co1 with other reported non–noble–metal electrocatalysts
Electrocatalyst Current density / (mA·cm−2) Overpotential / mV Reference NiC2O4-Co1 10 278 this work Ni2Co-N 10 214 [30] NiFe LDH 10 195 [31] NiFe-LDH/C 50 234 [32] NiFeV-P 10 234 [33] Co1.8Ni LDH 10 290 [34] Co-NiMoN-400 NR 10 294 [35] Co3O4/NC-350 10 298 [36] Ni2/3Fe1/3Al 10 299 [37] CoFeS/CNT 10 300 [38] Ni1.5Co1.5P/MFs 10 314 [39] -
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