该文采用一步水热法在泡沫镍表面原位生长V掺杂的镍铁层状双氢氧化物（NiFe LDH）,结合H2等离子体还原法,构建Ni纳米粒子锚定在大量氧空位和镍空位上的异质结构,增加活性位点数量,提升NiFe LDH的HER活性。结果表明,在1 mol/L的KOH电解液中电流密度为10 mA/cm2下催化剂的过电势仅为37.5 mV,Tafel斜率为49 mV/dec,经过100 h的恒电流测试其析氢活性无明显衰减。此外,全解水测试中其同样具有良好的析氢活性和稳定性,10 mA/cm2电流密度下全解水电压仅为1.57 V,经过1000 h的恒电流测试其析氢活性无明显下降。
Abstract
In this study, V-doped nickel-iron layered double hydroxide （NiFe LDH） grows in situ on the surface of nickel foam by one-step hydrothermal method, combines with H2 plasma reduction, to construct a heterostructure of Ni nanoparticles anchored to a large number of oxygen vacancies and nickel vacancies, increase the number of active sites, and enhance the HER activity of NiFe LDH. The results show that the overpotential of the catalyst at a current density of 10 mA/cm2 in a 1 mol/L KOH electrolyte is only 37.5 mV, and the Tafel slope is 49 mV/dec, and its hydrogen evolution activity is not significantly attenuated after 100 h constant current test. In addition, it also has good hydrogen evolution activity and stability in the total hydrolysis test, and the total hydrolysis voltage at a current density of 10 mA/cm2 is only 1.57 V, and its hydrogen evolution activity does not decrease significantly after 1000 h constant current test.
关键词
等离子体 /
镍铁氢氧化物 /
电催化剂 /
析氢反应 /
异质结
Key words
plasma /
nickel-iron hydroxide /
electrocatalyst /
hydrogen evolution reaction /
heterojunction
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