Boosting the Alkaline Hydrogen Evolution Electrocatalysis over Metallic Nickel Sites through Synergistic Coupling with Vanadium Sesquioxide.
Boosting the Alkaline Hydrogen Evolution Electrocatalysis over Metallic Nickel Sites through Synergistic Coupling with Vanadium Sesquioxide.
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DOI：
10.1002/cssc.201902599
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发表时间：
2019-12
期刊：
影响因子：
8.4
通讯作者：
Xin Yu Zhang;Haiyang Yuan;Fangxin Mao;C. Wen;L. Zheng;P. Liu;H. Yang
中科院分区：
文献类型：
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作者：
Xin Yu Zhang;Haiyang Yuan;Fangxin Mao;C. Wen;L. Zheng;P. Liu;H. Yang
对于可再生和可持续能源来说，开发用于碱性水电解中析氢反应（HER）的廉价且高效的电催化剂至关重要。我们在此报道了一种复合电催化剂，由镍钒三氧化二纳米颗粒组装在泡沫镍（Ni-V 2 O 3 /NF）上的多孔微球组成。所获得的复合材料对HER表现出优异的电催化性能，比商业Pt/C催化剂更加出色，起始过电势几乎为零，25 mV的极低过电势获得-10 mA cm -2 的电流密度，塔菲尔斜率58 mV dec -1 以及在1.0 M KOH中24小时的良好耐久性。理论计算表明，V 2 O 3 的存在可以优化活性Ni组分的电子结构，并不断加速水分子的解离，从而协同改善HER动力学。目前的工作将促进用于碱性水电催化的高效纳米复合电催化剂的开发。
For renewable and sustainable energy, developing cut-price and high-efficiency electrocatalysts for hydrogen evolution reaction (HER) in alkaline water electrolysis is of paramount importance. We herein report a compound electrocatalyst comprised of nickel-vanadium sesquioxide nanoparticles assembled porous microspheres on nickel foam (Ni-V 2 O 3 /NF). The achieved composite exhibits superior electrocatalytic performance towards HER, more outstanding than the commercial Pt/C catalyst in the light of nearly zero onset overpotential, an extremely low overpotential of 25 mV to obtain a current density of -10 mA cm -2 , a Tafel slope of 58 mV dec -1 and a good durability for 24 h in 1.0 M KOH. Theoratical calculation reveals that the presence of V 2 O 3 can optimize the electronic structures of active Ni components and continuously accelerate the dissociation of water molecules, which improves the HER kinetics synergistically. The present work will advance the development of highly efficient nanocomposite electrocatalysts for alkaline water electrocatalysis.