Crystalline and amorphous structure can entitle a catalyst with high stability and activity, respectively. Oxygen evolution reaction (OER) catalysts, which widely used in water electrolysis and rechargeable Zn-air batteries, often undergo a surface phase reconstruction process and generate amorphous active phases under applied anodic potential. Although widely known, few studies and strategies have been reported to rationally tune OER pre-catalysts for enhanced reaction kinetics. Herein, we report a trimetallic oxides (a/c-NiFeMoO_x) OER per-catalyst with rationally tunable amorphous/crystalline heterostructure degrees by a precise-tuning component strategy. The best a/c-NiFeMoO_x electrode exhibits an OER overpotential merely of 256 mV and a small cell-voltage of 1.52 V to reach 10 mA cm^–2 for water electrolysis, respectively. It is find that Mo leaching with tailored amorphous/crystalline heterostructure via the rational tuned degree of amorphousness promotes a rapid surface reconstruction of the a/c-NiFeMoO_x pre-catalyst to form (oxy)hydroxide active species, whilst operando Raman, ex-situ X-ray photoelectron spectroscopy and density functional theory (DFT) analysis show the ample oxygen vacancies generated by phase transition significantly accelerates the deprotonation of OH* and lower the O* ➝ OOH* free energy for a fast oxygen evolution kinetics. Additionally, the practical application of a/c-NiFeMoO_x cathode in rechargeable Zn-air battery delivers a robust long-term cycling (over 840 cycles).

结晶和无定形结构可以分别赋予催化剂高稳定性和活性。广泛应用于水电解和可充电锌空气电池的析氧反应 (OER) 催化剂通常会经历表面相重构过程，并在施加的阳极电位下产生非晶活性相。尽管广为人知，但很少有研究和策略被报道来合理调整 OER 预催化剂以增强反应动力学。在此，我们报告了一种三金属氧化物 (a/c-NiFeMoO _x ) OER 每催化剂，通过精确调整的组分策略具有可合理调整的非晶/结晶异质结构度。最好的 a/c-NiFeMoO _x电极表现出仅为 256 mV 的 OER 过电势和 1.52 V 的小电池电压，分别达到 10 mA cm ^–2用于水电解。研究发现，通过合理调整非晶度程度，通过定制的非晶/结晶异质结构浸出 Mo 促进 a/c-NiFeMoOx 预催化剂的快速表面重构以形成（氧_）氢氧化物活性物质，而原位拉曼，ex-原位X 射线光电子能谱和密度泛函理论 (DFT) 分析表明，相变产生的大量氧空位显着加速了 OH* 的去质子化，并降低了 O* ➝ OOH* 自由能，从而实现了快速析氧动力学。此外，a / c-NiFeMoO 的实际应用_{可充电锌空气电池中的x}阴极可提供稳健的长期循环（超过 840 次循环）。