Unique amorphous/crystalline heterophase coupling for an efficient oxygen evolution reaction,Nanoscale

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Unique amorphous/crystalline heterophase coupling for an efficient oxygen evolution reaction
Nanoscale ( IF 5.8 ) Pub Date : 2022-11-14 , DOI: 10.1039/d2nr05167b
Sitian Bai ₁ , Yiwei Mou ₁ , Jin Wan ₁ , Yanwei Wang ₁ , Weibo Li ₁ , Huijuan Zhang ₁ , Ping Luo ₁ , Yu Wang _{1,

2}

Affiliation

Designing amorphous/crystalline heterophase catalysts is still in the initial stage, and the study of amorphous/crystalline heterophase and carbon-free catalysts has not yet been realized. Herein, we report a unique amorphous/crystalline heterophase catalyst consisting of NiFe alloy nanoparticles (NPs) supported on Ti₄O₇ (NiFe/Ti₄O₇) for the first time, which is achieved by a heterophase supporting strategy of dual heat treatment. Surprisingly, the amorphous/crystalline heterophase is flexibly composed of amorphous and crystalline phases of alloy NPs and Ti₄O₇. The heterophase coupling endows the catalyst with a low overpotential (256 mV at 10 mA cm⁻²), a small Tafel slope (47 mV dec⁻¹) and excellent endurance stability (over 100 h) in 1 M KOH electrolyte, which already outperforms commercial RuO₂ (338 mV and 113 mV dec⁻¹) and exceeds most reported representative carbon-based and titanium-based non-precious metal catalysts. The density functional theory (DFT) calculations and experimental results reveal that the unique amorphous/crystalline heterophase coupling in NiFe/Ti₄O₇ results in electron transfer between the alloy NPs and Ti₄O₇, allowing more catalytically active sites and faster interfacial electron transfer dynamics. This work provides insights into the synthesis of amorphous/crystalline heterophase catalysts and can be generalized to the heterophase coupling of other transition metal-based electrocatalysts.

中文翻译：

用于高效析氧反应的独特非晶/结晶异相耦合

设计非晶/晶异相催化剂仍处于起步阶段，非晶/晶异相和无碳催化剂的研究尚未实现。_{在此，我们首次报道了一种由负载在 Ti 4} O ₇ (NiFe/Ti ₄ O ₇ )上的 NiFe 合金纳米粒子 (NPs) 组成的独特的非晶/结晶多相催化剂，这是通过双重热处理的多相负载策略实现的. 令人惊讶的是，非晶/结晶异相灵活地由合金 NPs 和 Ti ₄ O ₇的非晶相和结晶相组成。多相偶联赋予催化剂低过电势（10 mA cm ^{-2时为 256 mV})，在 1 M KOH 电解质中的小 Tafel 斜率 (47 mV dec ^-1 ) 和出色的耐久稳定性（超过 100 小时），其性能已经优于商业 RuO ₂（338 mV 和 113 mV dec ^-1）并且超过大多数报道的代表性碳基和钛基非贵金属催化剂。密度泛函理论 (DFT) 计算和实验结果表明，NiFe/Ti ₄ O _{7中独特的非晶/结晶异相耦合导致合金 NP 和 Ti}₄ O ₇之间的电子转移，允许更多的催化活性位点和更快的界面电子转移动力学。这项工作为非晶/结晶多相催化剂的合成提供了见解，可以推广到其他过渡金属基电催化剂的多相偶联。

更新日期：2022-11-14

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