Umapathy Krishnan, Muthamildevi Murugan, Thiruvengadam Dhanasingh, Vijayarangan Murugan, Rajan Kuppusamy, Jayabharathi Jayaraman
Department of Chemistry, Material Science Lab, Annamalai University, Annamalai Nagar, Tamilnadu 608002, India.
Langmuir. 2024 Jun 25;40(25):13102-13115. doi: 10.1021/acs.langmuir.4c01023. Epub 2024 Jun 12.
Water electrolysis is a key factor to generate mobile and sustainable energy sources for H production. Cobalt-based Prussian Blue analogues encompassed with polymer support electrocatalysts CoPBA@PANI (CoPBA@PANI-100, CoPBA@PANI-200, and CoPBA@PANI-300) have been synthesized and characterized. The well-designed CoPBA@PANI-200/GC shows a low overpotential (η) of 301 mV with a small Tafel slope (56 mV dec), comapred to that of IrO (348 mV ; 98 mV dec) for OER. The conductivity with stability of CoPBA@PANI have been increased due to the synergistic effect of CoPBA with PANI. PANI provides additional active sites and shows strong binding with Co ions, and the even distribution of CoPBA overcomes the sluggish kinetics. The turnover frequency (TOF) of CoPBA@PANI-200/GC (0.0212, s) was ∼15 times higher than IrO (0.0014 s) at 1.60 V. Furthermore, CoPBA@PANI-200/NF delivers low overpotential of 274 mV@10 mA cm and exhibits a durability of >250 h with a potential loss of 4.2%. Benefiting from strong electronic interaction between polymer support and evenly distributed CoPBA, CoPBAx@PANI shows higher electrochemical active surface area (ECSA) of 53.08 mF cm. The solar-based water electrolysis confirmed the practical use of CoPBA@PANI-200/NF (1.57 V) for eco-benign industrial H production. The CoPBA@PANI-200 shows exceptional OER performances as well as favorable kinetics to resolve the sluggish water oxidation. Hence, the cost-effective CoPBA@PANI performances opens a prospective way to boost the efficiency of other cobalt-derived catalysts in renewable energy devices.
水电解是生成用于制氢的移动和可持续能源的关键因素。已合成并表征了由聚合物负载型电催化剂CoPBA@PANI（CoPBA@PANI-100、CoPBA@PANI-200和CoPBA@PANI-300）包覆的钴基普鲁士蓝类似物。精心设计的CoPBA@PANI-200/GC在析氧反应（OER）中显示出301 mV的低过电位（η）和较小的塔菲尔斜率（56 mV dec⁻¹），与IrO₂（348 mV；98 mV dec⁻¹）相比。由于CoPBA与PANI的协同效应，CoPBA@PANI的导电性和稳定性得到了提高。PANI提供了额外的活性位点，并与Co离子表现出强结合，CoPBA的均匀分布克服了缓慢的动力学。在1.60 V时，CoPBA@PANI-200/GC的周转频率（TOF）（0.0212 s⁻¹）比IrO₂（0.0014 s⁻¹）高约15倍。此外，CoPBA@PANI-200/NF在10 mA cm⁻²时具有274 mV的低过电位，并表现出大于250 h的耐久性，电位损失为4.2%。得益于聚合物载体与均匀分布的CoPBA之间的强电子相互作用，CoPBAₓ@PANI显示出53.08 mF cm⁻²的更高电化学活性表面积（ECSA）。基于太阳能的水电解证实了CoPBA@PANI-200/NF（1.57 V）在生态友好型工业制氢中的实际应用。CoPBA@PANI-200表现出优异的析氧反应性能以及有利于解决缓慢水氧化的动力学。因此，具有成本效益的CoPBA@PANI性能为提高可再生能源装置中其他钴基催化剂的效率开辟了一条前景广阔的道路。
