A novel composite of poly(3-aminobenzoic acid) (PABA) and a cobalt zeolitic benzimidazolate framework (CoZIF) has been studied for the production of hydrogen through the hydrogen evolution reaction (HER). The structural characteristics and successful synthesis of PABA, CoZIF and the PABA/CoZIF composite were confirmed and investigated using different techniques. Probing-ray diffraction for phase analysis revealed that the composite showed a decrease and shift in peak intensities, confirming the incorporation of CoZIF on the PABA backbone via in situ polymerization, with an improvement in the crystalline phase of the polymer. The thermal stability of PABA was enhanced upon composite formation. Both scanning electron microscopy and transmission electron microscopy showed that the composite had a rough surface, owing to an interaction between the CoZIF and the external surface of the PABA. The electrochemical hydrogen evolution reaction (HER) performance of the synthesized samples was evaluated using cyclic voltammetry and Tafel analysis. The composite possessed a Tafel slope value of 156 mV/dec and an α of 0.38, suggesting that the Volmer reaction coupled with either the Heyrovsky or Tafel reaction as the rate determining step. The fabricated composite showed high thermal stability and excellent tolerance as well as high electroactivity towards the HER, showing it to be a promising non-noble electrocatalyst to replace Pt-based catalysts for hydrogen generation.

中文翻译：

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沸石沸石苯并咪唑酸酯骨架修饰的聚（3-氨基苯甲酸），用于电化学生产清洁氢气。

研究了一种新型的聚（3-氨基苯甲酸）（PABA）和沸石沸石苯并咪唑酸酯骨架（CoZIF）的复合材料，用于通过析氢反应（HER）生产氢。证实并研究了PABA，CoZIF和PABA / CoZIF复合材料的结构特征并成功地进行了研究。用于相分析的探测射线衍射显示，该复合物显示出峰强度的降低和移动，证实了通过原位聚合将CoZIF掺入到PABA主链上，并改善了聚合物的结晶相。复合材料形成后，PABA的热稳定性得到增强。扫描电子显微镜和透射电子显微镜均显示复合材料表面粗糙，由于CoZIF和PABA外表面之间的相互作用。使用循环伏安法和Tafel分析评估了合成样品的电化学放氢反应（HER）性能。该复合材料的Tafel斜率值为156 mV / dec，α为0.38，表明Volmer反应与Heyrovsky或Tafel反应结合在一起作为速率确定步骤。制成的复合材料显示出高的热稳定性，优异的耐受性以及对HER的高电活性，表明它是一种有前途的非贵族电催化剂，可替代基于Pt的催化剂来产生氢。该复合材料的Tafel斜率值为156 mV / dec，α为0.38，表明Volmer反应与Heyrovsky或Tafel反应结合在一起作为速率确定步骤。制成的复合材料显示出高的热稳定性，优异的耐受性以及对HER的高电活性，表明它是一种有前途的非贵金属电催化剂，可取代基于Pt的催化剂来产生氢。该复合材料的Tafel斜率值为156 mV / dec，α为0.38，表明Volmer反应与Heyrovsky或Tafel反应结合在一起作为速率确定步骤。制成的复合材料显示出高的热稳定性，优异的耐受性以及对HER的高电活性，表明它是一种有前途的非贵金属电催化剂，可取代基于Pt的催化剂来产生氢。