<br>从金属磷化物中获得的羟基氧化钴铁：高电流密度下析氧反应的高效电催化剂,ACS Applied Energy Materials

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从金属磷化物中获得的羟基氧化钴铁：高电流密度下析氧反应的高效电催化剂
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2023-05-25 , DOI: 10.1021/acsaem.3c00032
María Isabel Díez-García ₁ , Guillem Montaña-Mora ₁ , Marc Botifoll ₂ , Andreu Cabot _{1,

3} , Jordi Arbiol _{2,

3} , Mohammad Qamar ₄ , Joan Ramon Morante ₁

Affiliation

开发用于析氧反应（OER）的高电流密度阳极是制造实用且可靠的电化学电池的基础。在这项工作中，我们开发了一种基于羟基氧化钴铁的双金属电催化剂，该催化剂在水氧化方面表现出出色的性能。这种催化剂是从钴铁磷化物纳米棒中获得的，该纳米棒作为牺牲结构，通过磷的损失以及氧/氢氧化物的结合形成双金属羟基氧化物。 CoFeP 纳米棒是使用亚磷酸三苯酯作为磷前体，采用可扩展的方法合成的。它们在不使用粘合剂的情况下沉积在泡沫镍上，以实现快速电子传输、高效表面积和高密度活性位点。分析了 CoFeP 纳米颗粒的形态和化学转变，并与碱性介质和阳极电位下的单金属磷化钴进行了比较。由此产生的双金属电极具有低至 42 mV dec ^–1的塔菲尔斜率和较低的 OER 过电势。首次在1 A cm ^–2的高电流密度下测试带有集成CoFeP基阳极的阴离子交换膜电解装置，表现出优异的稳定性和接近100%的法拉第效率。这项工作开辟了一种将金属磷化物基阳极用于实际燃料电合成装置的方法。

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Cobalt–Iron Oxyhydroxide Obtained from the Metal Phosphide: A Highly Effective Electrocatalyst for the Oxygen Evolution Reaction at High Current Densities

The development of high current density anodes for the oxygen evolution reaction (OER) is fundamental to manufacturing practical and reliable electrochemical cells. In this work, we have developed a bimetallic electrocatalyst based on cobalt–iron oxyhydroxide that shows outstanding performance for water oxidation. Such a catalyst is obtained from cobalt–iron phosphide nanorods that serve as sacrificial structures for the formation of a bimetallic oxyhydroxide through phosphorous loss concomitantly to oxygen/hydroxide incorporation. CoFeP nanorods are synthesized using a scalable method using triphenyl phosphite as a phosphorous precursor. They are deposited without the use of binders on nickel foam to enable fast electron transport, a highly effective surface area, and a high density of active sites. The morphological and chemical transformation of the CoFeP nanoparticles is analyzed and compared with the monometallic cobalt phosphide in alkaline media and under anodic potentials. The resulting bimetallic electrode presents a Tafel slope as low as 42 mV dec^–1 and low overpotentials for OER. For the first time, an anion exchange membrane electrolysis device with an integrated CoFeP-based anode was tested at a high current density of 1 A cm^–2, demonstrating excellent stability and Faradaic efficiency near 100%. This work opens up a way for using metal phosphide-based anodes for practical fuel electrosynthesis devices.

更新日期：2023-05-25

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