Heterointerface enhanced NiFe LDH/V–Co4N electrocatalysts for the oxygen evolution reaction,Journal of Materials Chemistry A

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Heterointerface enhanced NiFe LDH/V–Co4N electrocatalysts for the oxygen evolution reaction
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-09-12 , DOI: 10.1039/d2ta04120k
Shuya Zhang ₁ , Lan Wang ₁ , Tianzhu Xie ₁ , Qiming Chen ₁ , Wenchao Peng ₁ , Yang Li ₁ , Fengbao Zhang ₁ , Xiaobin Fan _{1,

2,

3}

Affiliation

The development of high-performance and low-cost electrocatalysts for the oxygen evolution reaction (OER) is of great importance for renewable energy technologies. Herein, a highly efficient and stable self-supported electrocatalyst with V–Co₄N nanowires as the core and NiFe LDH nanosheet arrays as the shell is developed. The obtained NiFe LDH/V–Co₄N@NF shows strong electronic interaction at the heterointerface, which remarkably boosts its OER performance. It exhibits ultralow overpotentials of 203 and 240 mV at 10 and 100 mA cm⁻² in 1 M KOH solution, respectively, together with a much smaller Tafel slope of 26.0 mV dec⁻¹ and robust long-term durability. Structural characterization reveals that doping V contributes to the interfacial electron coupling between Co species and Fe species. Theoretical calculations confirm that the heterointerfaces reduce the free energy barriers of the rate-determining step. This study demonstrates the possibility of improving the OER performance of transition metal nitride catalysts through heterointerface engineering.

中文翻译：

用于析氧反应的异质界面增强 NiFe LDH/V-Co4N 电催化剂

开发用于析氧反应（OER）的高性能和低成本电催化剂对于可再生能源技术具有重要意义。_{在此，开发了一种以V-Co 4} N纳米线为核心、NiFe LDH纳米片阵列为壳的高效稳定的自支撑电催化剂。获得的 NiFe LDH/V–Co ₄ N@NF 在异质界面处显示出强烈的电子相互作用，显着提高了其 OER 性能。它在 1 M KOH 溶液中分别在 10 和 100 mA cm ^{-2下表现出 203 和 240 mV 的超低过电位，以及 26.0 mV dec}^-1的小得多的 Tafel 斜率和强大的长期耐用性。结构表征表明，掺杂 V 有助于 Co 物种和 Fe 物种之间的界面电子耦合。理论计算证实异质界面降低了速率决定步骤的自由能垒。该研究证明了通过异质界面工程提高过渡金属氮化物催化剂的 OER 性能的可能性。

更新日期：2022-09-12

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