Interface engineering: PSS-PPy wrapping amorphous Ni-Co-P for enhancing neutral-pH hydrogen evolution reaction performance
Interface engineering: PSS-PPy wrapping amorphous Ni-Co-P for enhancing neutral-pH hydrogen evolution reaction performance
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界面工程：PSS-PPy包裹非晶Ni-Co-P以增强中性pH析氢反应性能
DOI：
10.1016/j.cej.2021.129232
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发表时间：
2021-08
影响因子：
15.1
通讯作者：
Yongsheng Yu
中科院分区：
文献类型：
--
作者：
Fenyang Tian;Shuo Geng;Lin He;Yarong Huang;Akhmat Fauzi;Weiwei Yang;Yequn Liu;Yongsheng Yu
过渡金属磷化物在酸性和碱性溶液中表现出类似Pt的析氢反应（HER）活性，而在中性pH电解液中由于其高电阻和低传质效率，其HER性能非常差。在本工作中，以Ni Co P为核，吡咯和聚苯乙烯磺酸钠的混合聚合物为壳的PSS-PPy/Ni-Co-P纳米复合材料，在中性电解液中具有良好的电催化性能。采用电沉积法和化学沉积法在室温下制备了PSS-PPy/Ni-Co-P/CF自支撑电极。实验和DFT计算结果表明，PSS-PPy不仅改善了Ni-Co-P的导电性和亲水性，而且优化了Ni-Co-P的电子结构。因此，PSS-PPy/Ni-Co-P在中性pH和碱性电解液中表现出显著的HER活性，在10 mA cm− 2电流密度下的过电位分别为106和67 mV。此外，PSS-PPy/Ni-Co-P在中性pH、碱性电解质甚至海水中具有优异的稳定性。目前的表面改性方法指导我们设计更低成本、高效和稳定的电催化剂用于中性pH电解质中的HER。
Transition metal phosphides have shown Pt-like hydrogen evolution reaction (HER) activity in acid and alkaline solution, while their HER performance in neutral-pH is really poor owing to the high resistance and inefficient mass transfer in neutral-pH electrolyte. In this work, the well-arranged core/shell PSS-PPy/Ni-Co-P growing on Cu foil, in which Ni-Co-P is the core and the mixed polymer of pyrrole and sodium polystyrene sulfonate is the shell, has been demonstrated to be a highly efficient electrocatalyst for HER in neutral-pH electrolyte. The PSS-PPy/Ni-Co-P/CF self-supporting electrode was easily synthesized by electrodeposition and chemical deposition at room temperature. According to the experiment and DFT calculation results, PSS-PPy not only improves the conductivity and hydrophilicity of Ni-Co-P, but also optimizes the electronic structure of Ni-Co-P. Thus, the PSS-PPy/Ni-Co-P shows remarkable HER activity with only overpotential of 106 and 67 mV at the current density of 10 mA cm−2in neutral-pH and alkaline electrolytes, respectively. Furthermore, PSS-PPy/Ni-Co-P has excellent stability in neutral-pH, alkaline electrolytes and even seawater. The current surface modification method directs us to design more low-cost, high-efficiency and stable electrocatalysts for HER in neutral-pH electrolyte.
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