Engineered Nanoscale Single‐Metal‐Oxides Catalytic Thin Films for High‐Performance Water Oxidation,Energy Technology

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Engineered Nanoscale Single‐Metal‐Oxides Catalytic Thin Films for High‐Performance Water Oxidation
Energy Technology ( IF 3.6 ) Pub Date : 2021-01-16 , DOI: 10.1002/ente.202000896
Noor Ul Ain Babar ₁ , Majad Khan ₂ , Khurram Saleem Joya _{1,

2}

Affiliation

Surface assembling of nanoscale materials for electrocatalysis is imperative to progress water splitting. There is a dire need to develop cost‐effective and easily accessible methods to make metal oxides, aiming to execute the oxygen evolution reaction (OER) at low overpotential and high stability for long‐term activity. Thin‐film metal oxides for water oxidation are prepared via aerosol‐assisted chemical vapor deposition (AACVD) on simple substrates as shown here. Catalytic films (CFs) of CoO_x, NiO_x, CuO_x, and FeO_x are phase pure oxides, smooth, and of nanoparticulate type, and are highly crystalline. Water oxidation catalysis is initiated at low onset potentials and achieves 10 mA cm⁻² just at the potentials of 250–330 mV in 1.0 m KOH solution. All catalysts present impressive kinetics behavior for boosting OER activity, signifying their inherent potential for propelling water oxidation at lower energy demands. Excitingly, stable current densities remain sustained during prolonged period water catalysis. Promising behavior of the ultrafine CFs is attributed to the exploitation of the elegant synthetic strategy under controlled conditions to realize a high redox potential and cyclic M^2+/3+ couple activation with sustainable catalytic active sites. Nanoscale and porous features of the highly pure and crystalline films further promote the electrocatalytic process and remain intact even after long‐term catalytic investigations.

中文翻译：

用于高性能水氧化的工程化纳米级单金属氧化物催化薄膜

用于电催化的纳米级材料的表面组装对于进行水分解是必不可少的。迫切需要开发具有成本效益且易于使用的方法来制造金属氧化物，旨在以低超电势和高稳定性进行氧释放反应（OER），以实现长期活动。如图所示，通过气溶胶辅助化学气相沉积（AACVD）在简单的基材上制备用于水氧化的薄膜金属氧化物。CoO _x，NiO _x，CuO _x和FeO _x的催化膜（CFs）是相纯的氧化物，是光滑的纳米颗粒型，并且是高度结晶的。水氧化催化在低启动电位下启动，达到10 mA cm ^-2仅在1.0 m KOH溶液中的电位为250–330 mV 。所有催化剂都具有令人印象深刻的动力学性能，可提高OER活性，这表明它们在较低的能量需求下具有促进水氧化的内在潜力。令人兴奋的是，长时间的水催化过程中仍保持稳定的电流密度。超细CF的良好行为归因于在受控条件下采用优雅的合成策略，以实现高氧化还原电势以及具有可持续催化活性位的环状M ^{2 + / 3 +}偶合活化。高纯度和结晶性薄膜的纳米级和多孔特征进一步促进了电催化过程，即使经过长期的催化研究，仍可保持完整。

更新日期：2021-01-16

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