在 Ni-Co 双金属金属-有机骨架衍生的异质结构上，MoS <sub>2</sub>修饰和 P 包含用于水分解,Inorganic Chemistry

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在 Ni-Co 双金属金属-有机骨架衍生的异质结构上，MoS ₂修饰和 P 包含用于水分解
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2021-07-01 , DOI: 10.1021/acs.inorgchem.1c01478
Sivalingam Gopi ₁ , Vadivel Selvamani ₂ , Kyusik Yun ₁

Affiliation

由于动力学限制和对未来能量收集的关键重要性，展示用于完全水电解的高效非贵重双功能催化剂仍然具有挑战性。在此，通过简单的水热法合成了一种低成本的、用薄的 MoS ₂纳米片装饰的 Ni-Co 金属-有机骨架的集成复合材料，然后进行碳化和磷化以进行电化学析氧和析氢反应。这种复合异质结构在电催化过程中表现出优异的性能，在 1.0 M KOH 和 0.5 MH ₂ SO _{4 中}，析氧反应 (OER) 的过电位为 184 mV，析氢反应 (HER) 的过电位为 84 mV电解质达到 10 mA cm ^–2的电流密度，OER 的Tafel 斜率为 63 mV dec ^–1，HER 为96 mV dec ^–1。所得结果远优于商业基准催化剂的结果。此外，在线气相色谱法将对称池中的氢气生成量量化为 0.002121 摩尔，能量效率约为 2.237 毫克/千瓦时。因此，该复合电极的卓越性能进一步被证明是一种潜在可行的能量转换反应非贵金属电催化剂。

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MoS2 Decoration Followed by P Inclusion over Ni-Co Bimetallic Metal–Organic Framework-Derived Heterostructures for Water Splitting

Demonstrating a highly efficient non-noble bifunctional catalyst for complete water electrolysis remains challenging because of kinetic limitations and crucial importance for future energy harvesting. Herein, a low-cost, integrated composite of a Ni–Co metal–organic framework decorated with thin MoS₂ nanosheets was synthesized by a simple hydrothermal method followed by carbonization and phosphorization for electrochemical oxygen and hydrogen evolution reactions. Such a composite heterostructure exhibits outstanding performance in the electrocatalysis process with a lower overpotential of 184 mV for the oxygen evolution reaction (OER) and 84 mV for the hydrogen evolution reaction (HER) in 1.0 M KOH and 0.5 M H₂SO₄ electrolytes to reach a current density of 10 mA cm^–2, with a slight Tafel slope of 63 mV dec^–1 for the OER and 96 mV dec^–1 for the HER. The obtained results are far better than those of the commercial benchmark catalyst. Furthermore, online gas chromatography quantifies the amount of hydrogen generation in a symmetric cell as equal to 0.002121 moles with an energy efficiency of about 2.237 mg/kWh. Thus, the composite electrode’s remarkable performance is further demonstrated as a potentially viable alternative non-noble electrocatalyst for energy conversion reactions.

更新日期：2021-07-19

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