Abstract As the kinetically sluggish oxygen evolution reaction (OER) is considered to be a bottleneck in overall water splitting, it is necessary to develop a highly active and stable electrocatalyst to overcome this issue. Herein, we successfully fabricated a three-dimensional iron-dysprosium oxide co-regulated in-situ formed MOF-Ni arrays on carbon cloth (FeDy@MOF-Ni/CC) through a facile two-step hydrothermal method. Electrochemical studies demonstrate that the designed FeDy@MOF-Ni/CC catalyst requires an overpotential of only 251 mV to reach 10 mA cm−2 with a small Tafel slope of 52.1 mV dec−1. Additionally, the stability declined by only 5.5% after 80 h of continuous testing in 1.0 M KOH. Furthermore, a cell voltage of only 1.57 V in the overall water splitting system is sufficient to achieve 10 mA cm−2; this value is far better than that of most previously reported catalysts. The excellent catalytic performance originates from the unique 3D rhombus-like structure, as well as coupling synergies of Fe-Dy-Ni species. The combination of lanthanide and transition metal species in the synthesis strategy may open entirely new possibilities with promising potential in the design of highly active OER electrocatalysts.

中文翻译：

---

分层 Fe-Dy 氧化物的溶解-再生长调节镍-有机骨架的电子结构作为高活性和稳定的水分解电催化剂

摘要 由于动力学缓慢的析氧反应（OER）被认为是整体水分解的瓶颈，有必要开发一种高活性和稳定的电催化剂来克服这个问题。在此，我们通过简便的两步水热法在碳布（FeDy@MOF-Ni/CC）上成功制备了三维氧化铁镝共调节原位形成的MOF-Ni阵列。电化学研究表明，所设计的 FeDy@MOF-Ni/CC 催化剂仅需要 251 mV 的过电位即可达到 10 mA cm-2，且 Tafel 斜率为 52.1 mV dec-1。此外，在 1.0 M KOH 中连续测试 80 小时后，稳定性仅下降 5.5%。此外，整个水分解系统中仅 1.57 V 的电池电压就足以实现 10 mA cm-2；该值远优于大多数先前报道的催化剂。优异的催化性能源于独特的 3D 菱形结构，以及 Fe-Dy-Ni 物种的耦合协同作用。镧系元素和过渡金属物种在合成策略中的组合可能开辟全新的可能性，在设计高活性 OER 电催化剂方面具有广阔的潜力。