Epitaxial heterointerfacial electron bridge synchronizes oxygen evolution activity and stability on a layered double hydroxide surface†

EES catalysis Pub Date : 2024-04-02 DOI:10.1039/D4EY00037D
Jia Wang, Zelin Zhao, Min Guo, Liang Xiao, Haolin Tang, Jiantao Li, Zongkui Kou and Junsheng Li
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Abstract

Scalable green hydrogen production via electrocatalytic water splitting is largely restricted by the insufficient activity and stability of oxygen evolution reaction (OER) catalysts at the anode. As a class of the most active OER catalysts in alkaline electrolyzers, the application of layered double hydroxides (LDHs) remains a main challenge owing to the unstable lattice oxygen dissolution due to the dominant lattice oxygen-involving OER mechanism during long-term operation. Herein, we found that using an epitaxial hetero-interfacing nickel hydroxide (namely Ni(OH)2) as an electron bridge between an active FeCo LDH and Ni foam support to form an LDH*/NFO catalyst, the electronic storage capacity around the Fermi level (−0.5 to +0.5 eV, e-DFE) sharply increases from 0.93 per cell to 1.51 per cell. Subsequently, we demonstrate that this high e-DFE enables ceaseless and fast power injection into the kinetic process of intermediate species conversion and inhibits lattice oxygen dissolution in the active FeCo LDH. Consequently, it demonstrated a low OER overpotential of 246 mV at a current density of 100 mA cm−2 and ultrahigh stability for up to 3500 hours with an ultraslow overpotential increase rate of 9.4 × 10−3 mV h−1. Therefore, we developed an epitaxial hetero-interfacial electron bridging strategy to synchronize the activity and stability of available catalysts for scalable green hydrogen production via electrocatalytic water splitting.

Abstract Image

层状双氢氧化物表面的外延异表面电子桥同步提高了氧进化活性和稳定性
通过电催化水分离实现规模化绿色制氢在很大程度上受到阴极氧进化反应(OER)催化剂活性和稳定性不足的限制。层状双氢氧化物(LDHs)作为碱性电解槽中最活跃的氧演化反应催化剂,在长期运行过程中,由于晶格氧参与氧演化反应机制占主导地位,其晶格氧溶解不稳定仍然是一个主要挑战。在本文中,我们发现通过外延异质界面氢氧化镍(即 Ni(OH)2)作为活性铁钴二氧化物和镍泡沫载体之间的电子桥,形成 LDH*/NFO 催化剂,费米级(-0.5 eV~+0.5 eV,e-DFE)附近的电子存储容量从 0.93 个/电池急剧增加到 1.51 个/电池。我们随后证明,如此高的 e-DFE 能够在中间物种转换的动力学过程中持续而快速地注入能量,并抑制活性铁钴 LDH 的晶格氧溶解。因此,在电流密度为 100 mA cm-2 时,它具有 246 mV 的低 OER 过电位,以及长达 3500 小时的超高稳定性,过电位上升率超低,仅为 9.4×10-3 mV h-1。因此,我们提出了一种外延异质界面电子桥接策略,以同步提高现有催化剂的活性和稳定性,从而通过电催化水分离实现可扩展的绿色制氢。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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