Efficient and affordable electrocatalysts are a crucial part of rechargeable zinc air batteries (ZAB) to address the problems caused by the sluggish activity of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) on the cathode. Anchoring noble metals on transition-metal-based substances is a promising strategy to reinforce electrochemical activity and reduce the cost. Herein, we have developed a subsequent spontaneous-redox strategy to load Pt nanoparticles with 3.75% containing NiFe-LDH nanoflakes to boost the ORR activity. After that, NiFe-LDH@ Co₉S₈ is constructed as a rational design for bifunction catalysis. In the ORR process, the half-wave potential of the obtained catalyst, Pt-anchored NiFe-LDH@Co₉S₈, is 0.83 V vs RHE, showing better catalytic activity than Pt/C. In the OER process, the obtained catalyst exhibits a low overpotential of 280 mV, which is superior to that of RuO₂. Notably, aqueous ZAB and quasi-solid-state ZAB achieve peak power densities of 164.3 and 78.4 mW cm^–2, respectively. Furthermore, quasi-solid-state ZAB exhibits a long cycle lifespan for 240 cycles in 80 h, and a remarkable stability after bending for 50 cycles. This work paves the way for the design of the NiFe-LDH nanostructure by vacancy engineering.

中文翻译：

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高效双功能NiFe-LDH@Co9S8纳米花电催化剂锚定Pt纳米晶用于柔性准固态可充电锌空气电池


高效且经济实惠的电催化剂是可充电锌空气电池（ZAB）的重要组成部分，可解决阴极氧还原反应（ORR）和析氧反应（OER）活性低下引起的问题。将贵金属锚定在过渡金属基物质上是增强电化学活性和降低成本的一种有前景的策略。在此，我们开发了一种后续的自发氧化还原策略，将含有 3.75% 的 NiFe-LDH 纳米片负载到 Pt 纳米颗粒上，以提高 ORR 活性。之后，构建了 NiFe-LDH@ Co ₉ S ₈ 作为双功能催化的合理设计。在ORR过程中，所得催化剂Pt锚定NiFe-LDH@Co ₉ S ₈ 的半波电位为0.83 V vs RHE，表现出比RHE更好的催化活性铂/碳。在OER过程中，所得催化剂表现出280 mV的低过电势，优于RuO ₂ 。值得注意的是，水性ZAB和准固态ZAB的峰值功率密度分别达到164.3和78.4 mW cm ^–2 。此外，准固态ZAB表现出80小时内240次循环的长循环寿命，以及弯曲50次循环后显着的稳定性。这项工作为通过空位工程设计 NiFe-LDH 纳米结构铺平了道路。