Cobalt porphyrin intercalation into zirconium phosphate layers for electrochemical water oxidation
Cobalt porphyrin intercalation into zirconium phosphate layers for electrochemical water oxidation
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DOI：
10.1039/d0se01134g
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发表时间：
2021-01-21
影响因子：
5.6
通讯作者：
Villagran, Dino
中科院分区：
文献类型：
--
作者：
Barraza Alvarez, Isabel;Wu, Yanyu;Villagran, Dino
钴卟啉分子CoTcPP（TcPP = meso-四（4-羧基苯基）卟啉的阴离子）插层到磷酸锆（ZrP）层中，作为一种有效的方法使卟啉基分子电催化剂多相化。采用傅里叶变换红外光谱（FT-IR）、X射线粉末衍射（XRPD）、紫外-可见光谱（UV-Vis）、元素图谱、能量色散X射线（EDX）、电感耦合等离子体质谱（ICP-MS）和X射线光电子能谱（XPS）等方法对CoTcPP插层ZrP进行了表征。虽然CoTcPP分子由于羧基而不能在碱性环境中用作非均相催化剂，但插层物种（CoTcPP/ZrP）在用作非均相电催化剂时对KOH水溶液中的水氧化是有效的，并且显示出显著的催化耐久性。电化学结果表明CoTcPP/ZrP需要0.467 V的过电位才能达到10 mA cm（-2）的电流密度，而原始的α-ZrP显示出可忽略的电催化OER行为。
A cobalt porphyrin molecule, namely CoTcPP (TcPP = the dianion of meso-tetra(4-carboxyphenyl)porphyrin), is intercalated into zirconium phosphate (ZrP) layers as an effective way to heterogenize a porphyrin-based molecular electrocatalyst. Fourier-transform infrared (FT-IR) spectroscopy, X-ray powder diffraction (XRPD) measurements, UV-Vis spectroscopy, elemental mapping, energy dispersive X-ray (EDX) analysis, inductively coupled plasma mass spectrometry (ICP-MS) and X-ray photoelectron spectroscopy (XPS) were utilized to determine the successful intercalation of CoTcPP into ZrP. While the CoTcPP molecule is not amendable to be used as a heterogeneous catalyst in basic environment due to the carboxylic groups, the intercalated species (CoTcPP/ZrP) is effective towards water oxidation from KOH aqueous solution when utilized as a heterogeneous electrocatalyst and shows remarkable catalytic durability. Electrochemical results show that CoTcPP/ZrP requires an overpotential of 0.467 V to achieve a current density of 10 mA cm(-2) while the pristine alpha-ZrP shows negligible electrocatalytic OER behavior.