Singh Aditya Narayan, Hajibabaei Amir, Diorizky Muhammad Hanif, Ba Qiankai, Nam Kyung-Wan
Department of Energy and Materials Engineering, Dongguk University, Seoul 04620, Republic of Korea.
Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK.
Nanomaterials (Basel). 2023 Feb 27;13(5):905. doi: 10.3390/nano13050905.
Enhancing the participation of the lattice oxygen mechanism (LOM) in several perovskites to significantly boost the oxygen evolution reaction (OER) is daunting. With the rapid decline in fossil fuels, energy research is turning toward water splitting to produce usable hydrogen by significantly reducing overpotential for other half-cells' OER. Recent studies have shown that in addition to the conventional adsorbate evolution mechanism (AEM), participation of LOM can overcome their prevalent scaling relationship limitations. Here, we report the acid treatment strategy and bypass the cation/anion doping strategy to significantly enhance LOM participation. Our perovskite demonstrated a current density of 10 mA cm at an overpotential of 380 mV and a low Tafel slope (65 mV dec) much lower than IrO (73 mV dec). We propose that the presence of nitric acid-induced defects regulates the electronic structure and thereby lowers oxygen binding energy, allowing enhanced LOM participation to boost OER significantly.
增强几种钙钛矿中晶格氧机制（LOM）的参与度以显著促进析氧反应（OER）是一项艰巨的任务。随着化石燃料的迅速减少，能源研究正转向通过大幅降低其他半电池OER的过电位来进行水分解以生产可用氢气。最近的研究表明，除了传统的吸附质演化机制（AEM）外，LOM的参与可以克服其普遍存在的比例关系限制。在这里，我们报告了酸处理策略，并绕过了阳离子/阴离子掺杂策略，以显著增强LOM的参与度。我们的钙钛矿在380 mV的过电位下表现出10 mA cm的电流密度，以及比IrO₂（73 mV dec⁻¹）低得多的低塔菲尔斜率（65 mV dec⁻¹）。我们提出，硝酸诱导的缺陷的存在调节了电子结构，从而降低了氧结合能，使得增强的LOM参与度能够显著促进OER。
