The development of high-efficiency catalysts for carbon dioxide reduction reaction (CO₂RR) and oxygen evolution reactions (OER) is an important strategy to solve the current energy crisis. In this paper, solid-phase exfoliation and electrostatic self-assembly strategies are developed to couple ultrathin NiFe-layered-double-hydroxide nanosheets and carbon nanotubes (CNT@NiFe-LDH NS) as an OER catalyst. Then, NiFe nanoparticles anchored on the N-doped CNT (CNT-N-NiFe) for electrocatalyst of CO₂RR is synthesized via pyrolysis of a mixture of CNT@NiFe-LDH NS and melamine in a nitrogen atmosphere at 750 °C, utilizing the ultrathin NiFe-LDH NS as a metal source and CNT as the framework. CNT@NiFe-LDH NS nanohybrid exhibits a better catalytic activity for OER (with an overpotential of 270 mV at the current density of 20 mA cm^–2 and remarkably stable durability) than Bulk NiFe-LDH in 1 m KOH. Moreover, the CNT-N-NiFe catalyst exhibits a Faradaic efficiency of ≈82.6% for the reduction of CO₂ to CO at −0.7 V (vs reversible hydrogen electrode) with a current density of CO 10.2 mA cm^–2. The method of preparing CO₂RR catalysts provides a new idea of the preparation of bimetallic CO₂RR electrocatalysts.

中文翻译：

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高温氮化诱导碳纳米管@NiFe-层状双氢氧化物纳米片作为放氧反应电催化剂用于CO2电还原

开发用于二氧化碳还原反应（CO ₂ RR）和析氧反应（OER）的高效催化剂是解决当前能源危机的重要战略。在本文中，开发了固相剥离和静电自组装策略，以将超薄 NiFe 层状双氢氧化物纳米片和作为 OER 催化剂的碳纳米管 (CNT@NiFe-LDH NS) 结合起来。然后，NiFe 纳米粒子锚定在 N 掺杂的 CNT (CNT-N-NiFe) 上用于 CO _{2 的}电催化剂RR是通过CNT@NiFe-LDH NS和三聚氰胺的混合物在750°C的氮气氛中热解合成的，利用超薄NiFe-LDH NS作为金属源和CNT作为框架。CNT@NiFe-LDH NS 纳米杂化物在 1 m KOH 中表现出比块状 NiFe-LDH更好的 OER 催化活性（在 20 mA cm ^–2的电流密度下具有 270 mV 的过电位和非常稳定的耐久性）  。此外，CNT-N-NiFe 催化剂在 CO 10.2 mA cm ^–2的电流密度下，在 -0.7 V（相对于可逆氢电极）下将 CO ₂还原为 CO 的法拉第效率约为 82.6% 。CO ₂ RR催化剂的制备方法为双金属CO ₂的制备提供了新思路RR 电催化剂。