Hierarchical Edge-Rich Nickel Phosphide Nanosheet Arrays as Efficient Electrocatalysts toward Hydrogen Evolution in Both Alkaline and Acidic Conditions
Hierarchical Edge-Rich Nickel Phosphide Nanosheet Arrays as Efficient Electrocatalysts toward Hydrogen Evolution in Both Alkaline and Acidic Conditions
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DOI：
10.1021/acssuschemeng.8b06861
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发表时间：
2019-03
影响因子：
8.4
通讯作者：
Qing Yan;Xi Chen;Tong Wei;Guiling Wang;Min Zhu;Yikuan Zhuo;Kui Cheng;K. Ye;K. Zhu;
中科院分区：
文献类型：
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作者：
Qing Yan;Xi Chen;Tong Wei;Guiling Wang;Min Zhu;Yikuan Zhuo;Kui Cheng;K. Ye;K. Zhu;
寻找高活性、高稳定性、低成本的析氢反应电催化剂是电化学制氢的当务之急。我们提出了一种有效的合成方法，在泡沫镍上获得自支撑、分层且边缘丰富的磷化镍纳米片阵列（Ni 2 P NSs-NF），其被成功地用作用于HER的高效、三维（3D）无粘合剂电极。受益于Ni 2 P NSs中具有丰富边缘的3D开放纳米结构，Ni 2 P NSs-NF电极在碱性和酸性条件下都表现出上级的HER活性。在碱性溶液（1 M KOH）和酸性溶液（0.5 M H2SO 4）中分别需要89 mV和67 mV的低过电位，以驱动10 mA cm-2，并分别具有82和57 mV dec-1的低塔菲尔斜率。此外，分级Ni 2 P NSs-NF电极甚至在10，000次循环后也没有显示出朝向HER的明显性能衰减。理论计算结果表明，氢原子的自由能与原子核的自由能有关。
Searching highly active, high stability, low-cost electrocatalysts toward the hydrogen evolution reaction (HER) is imperative for electrochemical hydrogen production. We propose an effective synthetic method to obtain self-supported, hierarchical, and edge-rich nickel phosphide nanosheet arrays on nickel foam (Ni2P NSs-NF), which are successfully employed as a high-efficiency, three-dimensional (3D) binder-free electrode for the HER. Benefiting from the 3D open nanostructure with abundant edges in the Ni2P NSs, the Ni2P NSs-NF electrode exhibits superior activity for the HER both in alkaline and acidic conditions. It requires low overpotentials of 89 mV in the alkaline solution (1 M KOH) and 67 mV in the acidic solution (0.5 M H2SO4) to drive 10 mA cm–2 with low Tafel slopes of 82 and 57 mV dec–1, respectively. Besides, the hierarchical Ni2P NSs-NF electrode shows no apparent performance decay toward the HER even after 10,000 cycles. Theoretical calculation results prove that the free energy of hydrogen a...