Surface Engineering of Porphyrin Coordination on a Carbon Nanotube for Efficient Hydrogen Evolution,ChemCatChem

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Surface Engineering of Porphyrin Coordination on a Carbon Nanotube for Efficient Hydrogen Evolution
ChemCatChem ( IF 3.8 ) Pub Date : 2020-03-26 , DOI: 10.1002/cctc.202000104
Lidong Wang _{1,

2} , Zhaosheng Zhang _{1,

2} , Meng Li _{1,

2} , Qiuhan Li _{1,

2} , Bo Wang _{1,

2} , Shuwen Wang ₃ , Huang Zhou ₄ , Boyang Mao ₅

Affiliation

Functionalised porphyrins have attracted considerable attention owing to their ability to coordinate with numerous metal ions. We design and synthesize a novel composite system based on functionalised Pt(II)‐porphyrin and multiwalled carbon nanotubes for hydrogen evolution reaction (HER) electrocatalysis. Rather than qualitatively integrating porphyrin with carbon nanotubes, the optimized Pt(II)‐porphyrin loading and precisely morphology control could be fine‐tuned and quantitatively premeditated by using fluorescence and UV‐vis titration based on the unique π–π interactions behaviour of the porphyrin for the first time. The as‐prepared composites exhibit superior HER catalytic activity with an overpotential of 35 mV for an electrocatalytic current density of j=−10 mA cm⁻² and a Tafel slope of 32.3 mV dec⁻¹. Moreover, such catalysts do not exhibit observable activity decay after a 1000‐cycle stability test, thus demonstrating their excellent durability. To further reduce Pt loading to achieve cost efficiency, we develop a Pt−Co bimetallic HER catalyst with an ultra‐low platinum content through a straightforward synthesis pathway with high catalytic activity and stability. This study provides a new approach for preparing a highly active and stable HER catalyst, which could potentially be extended to other reactions to improve the utilization efficiency of precious metal catalysts.

中文翻译：

碳纳米管上卟啉配位的表面工程，可有效释放氢气

功能化的卟啉由于能够与多种金属离子配位而备受关注。我们设计和合成了一种基于功能化Pt（II）-卟啉和多壁碳纳米管的新型复合系统，用于氢析出反应（HER）电催化。无需定性地整合卟啉与碳纳米管，可以基于卟啉独特的π-π相互作用行为，通过荧光和UV-vis滴定法对优化的Pt（II）-卟啉上样量和精确的形态控制进行微调和量化首次。所制备的复合材料显示出优异的HER催化活性，对于j = -10 mA cm ^-2的电催化电流密度和32.3 mV dec的Tafel斜率，过电势为35 mV^-1。此外，此类催化剂在经过1000次循环的稳定性测试后不会表现出可观察到的活性下降，因此证明了其出色的耐久性。为了进一步降低Pt负载以实现成本效益，我们通过具有高催化活性和稳定性的直接合成途径开发了铂含量极低的Pt-Co双金属HER催化剂。这项研究为制备高活性和稳定的HER催化剂提供了一种新方法，可以将其扩展到其他反应中，以提高贵金属催化剂的利用效率。

更新日期：2020-03-26

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