Yasser A. Shaban , Shahed U.M. Khan , Mohamed Abdel Salam , Radwan Khalid Al-Farawati , Mohammed Ali Ghandourah , Doaa Fowzi Baamer , Mousa Zobidi
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引用次数: 0
摘要
背景利用阳极氧进化反应(OER)和阴极氢进化反应(HER)进行电化学水分离是一种非常有前景的制氢方法。方法本文利用喷雾热解技术在三维(3D)开孔结构的铜(CF)和镍铁(NFF)泡沫上分别合成了铁、钴、镍三元混合氧化物和碳掺杂氧化钛(C-TiO2)的新型电极。然后在三种不同的电解质溶液中评估了这些电极的电催化性能:重要发现添加缓冲介质(硼酸盐缓冲液)成功地克服了与海水分离相关的挑战。达到 80 mA cm-2 电流密度所需的电位从海水中相对于 RHE 的 1.16 V 急剧下降到缓冲海水中的 968 mV。值得注意的是,在 1.3 V 对 RHE 的恒定电位下,电流密度从海水的 93.3 mA cm-2 显著增加到缓冲海水的 200.8 mA cm-2。铁-钴-镍@CF 和 C-TiO2@NFF 电极的塔菲尔斜率分别为 76 mV dec-1 和 90 mV dec-1。
Synergistic 3D architecture of Fe-Co-Ni@CF/C-TiO2@NFF for high-performance electrochemical seawater splitting for hydrogen generation
Background
Electrochemical water splitting, employing both the anodic oxygen evolution reaction (OER) and the cathodic hydrogen evolution reaction (HER), emerges as highly promising method for hydrogen production.
Methods
Herein the spray pyrolysis technique was utilized for the synthesis of novel electrodes of ternary mixed oxide of Fe, Co, and Ni and carbon doped titanium oxide (C-TiO2) on a three-dimensional (3D) open-pore structure of Cu (CF) and Ni-Fe (NFF) foams, respectively. The electrocatalytic performances of these electrodes were then evaluated in three different electrolyte solutions: 1.0 M KOH, natural seawater, and buffered natural seawater.
Significant findings
The addition of buffer media (borate buffer) successfully overcame the challenges associated with seawater splitting. The required potential to reach a current density of 80 mA cm−2 decreased drastically from 1.16 V vs RHE in seawater to just 968 mV in buffered seawater. Remarkably at a constant potential of 1.3 V vs RHE, the current density increased significantly from 93.3 mA cm−2 for seawater to 200.8 mA cm−2 for buffered seawater. Low Tafel slopes of 76 mV dec−1 and 90 mV dec−1 were observed for Fe-Co-Ni@CF and C-TiO2@NFF electrodes, respectively.
期刊介绍:
Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.