纳米多孔Ni-Co电极的制备及其电催化析氢性能
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摘要
采用真空电弧熔炼与快速凝固相结合的方法制备了Ni_(30)Al_(70)、Ni_(10)Co_(20)Al_(70)合金条带,经过电化学脱合金化除Al,成功得到多孔Ni电极、纳米多孔Ni-Co电极.通过XRD、SEM等微观技术表征了电极的相结构和表面形貌.运用电化学线性扫描(LSV)、电化学阻抗谱(EIS)等手段研究了电极在w(NaOH)=20%溶液中的析氢反应(HER)电催化活性.结果表明:与纳米多孔Ni电极相比,纳米多孔Ni-Co电极具有低的析氢过电位、低的析氢反应电阻及高的比表面积.
Ni_(30)Al_(70)、Ni_(10)Co_(20)Al_(70) alloying straps were prepared with combined method of vacuum arc melting rapid solidifying.Then,both porous Ni electrode and nano-porous Ni-Co electrodes were successfully obtained by means of eliminating dissolution Al with electrochemical dealloying.The phase composition and surface morphology of the electrode were characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM).The electro-catalytic activity of hydrogen evolution reaction(HER)of the porous Ni and nano-porous Ni-Co electrodes in NaOH solution with mass-fraction of 20%,was investigated by means of electrochemical linear voltammetric scanning(LSV)and electrochemical impedance spectroscopy(EIS).The result showed that the nano-porous Ni-Co electrode would exhibit a lower over-potential and resistance for HER and a higher specific surface area than that of the porous Ni electrode.
Ni_(30)Al_(70)、Ni_(10)Co_(20)Al_(70) alloying straps were prepared with combined method of vacuum arc melting rapid solidifying.Then,both porous Ni electrode and nano-porous Ni-Co electrodes were successfully obtained by means of eliminating dissolution Al with electrochemical dealloying.The phase composition and surface morphology of the electrode were characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM).The electro-catalytic activity of hydrogen evolution reaction(HER)of the porous Ni and nano-porous Ni-Co electrodes in NaOH solution with mass-fraction of 20%,was investigated by means of electrochemical linear voltammetric scanning(LSV)and electrochemical impedance spectroscopy(EIS).The result showed that the nano-porous Ni-Co electrode would exhibit a lower over-potential and resistance for HER and a higher specific surface area than that of the porous Ni electrode.
引文
[1]徐超.碱性电解水析氢合金现状[D].长沙:湖南大学,2011.
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[9]刘家琴,吴玉程,薛茹君.空心微珠表面化学镀Ni-Co-P合金[J].物理化学学报,2006,22(2):239-243.
[10]马强,张跃兴,隋然,等.多孔基Ni-Sn合金析氢阴极的研究[J].舰船防化,2010,5(5):47-50.
[11]山川宏二,椿野晴繁,秋吉浩一,等.金属表面技术[J].1987,38(7):285-289.
[12]周琦,王文辉,吴海涛,等.腐蚀因素对去合金化法制备纳米多孔铜材料结构的影响[J].兰州理工大学学报,2013,39(2):1-4.
[13]周琦,李大鹏,王文辉,等.不同去合金化法对制备纳米多孔合金微观结构的影响[J].兰州理工大学学报,2013,39(5):1-4.
[2]杜晶晶.纳米多级孔镍合金复合合金的制备及电催化析氢性能研究[D].长沙:中南大学,2014.
[3]李小波,张平.金属价的确定方法[J].材料导报,2010,24(3):102-107.
[4]CONWAY B,JERKIEWICZ G.Relation of energies and coverages of underpotential and overpotential deposited H at Pt and other metals to the‘volcano curve’for cathodic H2evolution kinetics[J].Electrochimica Acta,2000,45(25):4075-4083.
[5]PASEKA I.Evolution of hydrogen and its sorption on remarkable active amorphous smooth Ni-P(x)electrodes[J].Electrochimica Acta,1995,40(11):1633-1640.
[6]YAJI S,KAWAKAMI A,MURASE K,et al.Ni-Mo alloying of nickel surface by altemating pulsed electrolysis using molybdenum(VI)baths[J].Electrochimica Acta,2007,52(19):6041-6051.
[7]杨静,张存中,吴仲达.非晶态Ni-Mo-Co合金的制备和析氢性能[J].应用化学,2000,17(5):475-478.
[8]王国庆,尉海军,朱磊,等.电沉积制备泡沫Ni-Mo-Co合金[J].金属功能材料,2011,18(2):24-27.
[9]刘家琴,吴玉程,薛茹君.空心微珠表面化学镀Ni-Co-P合金[J].物理化学学报,2006,22(2):239-243.
[10]马强,张跃兴,隋然,等.多孔基Ni-Sn合金析氢阴极的研究[J].舰船防化,2010,5(5):47-50.
[11]山川宏二,椿野晴繁,秋吉浩一,等.金属表面技术[J].1987,38(7):285-289.
[12]周琦,王文辉,吴海涛,等.腐蚀因素对去合金化法制备纳米多孔铜材料结构的影响[J].兰州理工大学学报,2013,39(2):1-4.
[13]周琦,李大鹏,王文辉,等.不同去合金化法对制备纳米多孔合金微观结构的影响[J].兰州理工大学学报,2013,39(5):1-4.