Structural characterizations of amorphous RuNiMo oxides (a-RNMO)

Major Contributions
 

1.Amorphous NiMoOx anchored with Ru single atoms (a-RNMO) was synthesized via a one-step room-temperature co-precipitation method, achieving low overpotential (1.78 V at 1 A cm⁻²) and high stability (>100 h) in anion exchange membrane water electrolyzers. 

2.Operando spectroscopy and DFT calculations reveal dynamic reconstruction into amorphous/crystalline NiOOH, with Ru single atoms modulating the electronic structure to enhance intermediate adsorption and OER activity through a complementary amorphous–electronic mechanism. 

3.a-RNMO outperforms commercial RuO₂ in mass and specific activities, demonstrating that anchoring metal single atoms on amorphous supports can balance high performance with economic efficiency for practical alkaline OER applications.

主要貢獻
 

1.一步室溫合成與高效性能：透過一步室溫共沉澱法（one-step room-temperature co-precipitation），合成了錨定釕（Ru）單原子的非晶態 NiMoOx (a-RNMO)。該材料在陰離子交換膜水電解槽（AEMWE）中展現優異性能：低過電位：在 1 A\cm-2 的大電流密度下，電壓僅需 1.78 V。高穩定性：穩定運行超過 100 小時。

2.動態重構與電子調控機制：原位光譜（Operando spectroscopy）與 DFT 計算揭示，催化劑在反應中會動態重構（dynamic reconstruction） 為非晶態/結晶態混合的 NiOOH 物種。Ru 單原子透過調節電子結構，以一種互補的「非晶態—電子機制」增強了中間體的吸附能力與析氧反應（OER）活性。

3.超越商用標準與經濟效益：a-RNMO 在質量活性（mass activity）與比活性（specific activity）上均優於商用 RuO2。這證明了在非晶態載體上錨定金屬單原子，能有效平衡高性能與經濟效益，適用於實際的鹼性 OER 應用。