Transition-metal species embedded in carbon have sparked intense interest in the fields of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). However, improvement of the electrocatalytic kinetics remains a challenge caused by the synergistic assembly. Here, we propose a biochemical strategy to fabricate the Co nanoparticles (NPs) and Co/Ni–N₄–C co-embedded N-doped porous carbon (CoNPs&Co/Ni–N₄–C@NC) catalysts via constructing the zeolitic imidazolate framework (ZIF)@yeast precursor. The rich amino groups provide the possibility for the anchorage of Co²⁺/Ni²⁺ ions as well as the construction of Co/Ni–ZIF@yeast through the yeast cell biomineralization effect. The functional design induces the formation of CoNPs and Co/Ni–N₄–C sites in N-doped carbon as well as regulates the porosity for exposing such sites. Synergy of CoNPs, Co/Ni–N₄–C, and porous N-doped carbon delivered excellent electrocatalytic kinetics (the ORR Tafel slope of 76.3 mV dec^–1 and the OER Tafel slope of 80.4 mV dec^–1) and a high voltage of 1.15 V at 10 mA cm^–2 for the discharge process in zinc air batteries. It provides an effective strategy to fabricate high-performance catalysts.

中文翻译：

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通过 Co 纳米颗粒与 Co/Ni-N4-C- 和 N-掺杂多孔碳的协同作用增强电催化动力学


嵌入碳中的过渡金属物质引起了氧还原反应（ORR）和析氧反应（OER）领域的强烈兴趣。然而，电催化动力学的改进仍然是协同组装带来的挑战。在这里，我们提出了一种生化策略来制造 Co 纳米颗粒 (NPs) 和 Co/Ni–N ₄ –C 共嵌入 N 掺杂多孔碳 (CoNPs&Co/Ni–N ₄ /Ni ²⁺ 离子的锚定以及通过酵母细胞生物矿化作用构建Co/Ni–ZIF@yeast提供了可能性。功能设计诱导 N 掺杂碳中 CoNP 和 Co/Ni–N ₄ -C 位点的形成，并调节暴露这些位点的孔隙率。 CoNPs、Co/Ni–N ₄ -C 和多孔 N 掺杂碳的协同作用提供了出色的电催化动力学（ORR Tafel 斜率为 76.3 mV dec ^–1 和 OER Tafel 斜率80.4 mV dec ^–1 ）和 10 mA cm ^–2 下 1.15 V 的高电压，用于锌空气电池的放电过程。它为制造高性能催化剂提供了有效的策略。