用于高效水氧化的透明掺铁氢氧化镍电催化剂,Sustainable Energy & Fuels

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用于高效水氧化的透明掺铁氢氧化镍电催化剂
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2023-05-22 , DOI: 10.1039/d3se00527e
Amira Y. Ahmed ₁ , Dattatray S. Dhawale ₂ , Tarek A. Kandiel _{3,

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Affiliation

开发用于析氧反应 (OER) 的透明电催化剂薄膜对于制造用于太阳能制氢的串联光电化学装置是必不可少的。在此，我们开发了一种简便的基于溶液的方法，用于在导电玻璃基板 (FTO) 上沉积高度透明的铁结合氢氧化镍析氧电催化剂。对制造的电极的紫外-可见光谱和电化学结果的分析表明，将铁掺入氢氧化镍电催化剂中极大地影响了它们对 OER 的透射率和电催化活性。它增加了电导率并在较低的过电势下激活了 Ni在电化学阻抗测量的支持下稳定 OER 中间体。在优化的铁含量下，获得的掺铁氢氧化镍电极 (FeNi-10) 具有纳米片状形态，在碱性水介质 (1.0 M NaOH) 中仅需 290 mV 即可产生 10 mA cm -2^电流出色的稳定性。相比之下，原始氢氧化镍电极在相同条件下需要 384 mV。获得的过电势明显低于基准RuO ₂和IrO _{2的过电势}沉积在 FTO 基底上的氧化物 OER 电催化剂。FeNi-10 电极的透光率与 FTO 玻璃相当。实现这种具有成本效益、高活性和透明的铁结合氢氧化镍 OER 电极为制造用于低成本太阳能燃料生产的串联光电化学装置提供了机会。

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A transparent iron-incorporated nickel hydroxide electrocatalyst for efficient water oxidation

Developing transparent electrocatalyst films for the oxygen evolution reaction (OER) is indispensable for fabricating a tandem photoelectrochemical device for solar hydrogen production. Herein, we developed a facile solution-based method for depositing highly transparent iron-incorporated nickel hydroxide oxygen evolution electrocatalysts on conductive glass substrates (FTO). The analysis of UV-Vis spectra and electrochemical results of the fabricated electrodes indicated that the incorporation of iron into the nickel hydroxide electrocatalysts greatly influences their transmittance and electrocatalytic activity toward the OER. It increases the conductivity and activates the Ni sites at lower overpotential via stabilizing the OER intermediates as supported by electrochemical impedance measurements. At the optimized iron content, the obtained iron-incorporated nickel hydroxide electrode (FeNi-10) has a nanoplatelet-like morphology, and it requires just 290 mV to generate 10 mA cm⁻² in an alkaline aqueous medium (1.0 M NaOH) with excellent stability. In comparison, a pristine nickel hydroxide electrode requires 384 mV under the same conditions. The overpotential obtained is significantly lower than that of the benchmark RuO₂ and IrO₂ oxide OER electrocatalysts deposited on FTO substrates. The transmittance of the FeNi-10 electrode is comparable to that of the FTO glass. Achieving such cost-effective, highly active, and transparent iron-incorporated nickel hydroxide OER electrodes offers an opportunity to fabricate tandem photoelectrochemical devices for low-cost solar fuel production.

更新日期：2023-05-22

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