Rational design of highly efficient bifunctional electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is critical for sustainable energy conversion. Herein, motivated by the high activity of OER catalyst on water dissociation that is the rate-determining step of alkaline HER, a bifunctional catalyst of metallic nickel-decorated transition metal oxide nanosheets vertically grown on ceria film (ceria/Ni-TMO) is synthesized by composition controlling and surface engineering. Because of the idealized electronic structure of the active centers and the abundance of such sites, as well as a synergistic effect between the carbon cloth/ceria film and the in situ formed TMO/Ni nanoparticles, the as-synthesized ceria/Ni-TMO exhibited long-time stability and a low cell voltage of 1.58 V at 10 mA/cm² when applied as both the cathode and anode in alkaline solutions. Moreover, it is the first time that pH-independent four-proton-coupled-electron-transfer processes and multiple adsorption–desorption processes were found to occur at the interfaces of ceria/TMO and Ni/TMO in a single catalyst for catalyzing OER and HER, respectively.

中文翻译：

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通过定制CeO _2-过渡金属氧化物-Ni纳米界面增强碱性溶液中过渡金属双功能电催化剂的完全水分解性能

合理设计用于氢释放反应（HER）和氧释放反应（OER）的高效双功能电催化剂，对于可持续的能量转换至关重要。在此，受作为碱性HER速率决定步骤的OER催化剂对水解离的高活性的激励，合成了在二氧化铈膜上垂直生长的金属镍修饰的过渡金属氧化物纳米片的双功能催化剂（ceria / Ni-TMO）通过成分控制和表面工程。由于活性中心的理想电子结构以及此类位点的丰富性，以及碳布/二氧化铈薄膜与原位形成的TMO / Ni纳米粒子之间的协同作用，因此显示出了合成后的二氧化铈/ Ni-TMO。长期稳定性，在10 mA / cm的条件下电池电压低至1.58 V当在碱性溶液中同时用作阴极和阳极时，结果为²。此外，这是首次发现在单一催化剂中，二氧化铈/ TMO和Ni / TMO的界面上会发生不依赖pH值的四质子耦合电子转移过程和多个吸附-解吸过程。她，分别。