Ruijing Wang, De Zhang, Sijia Luo, Lijuan Jiang, Qunlong Wang, Linlin Chen, Guang-Feng Wei, Xuefeng Wang
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引用次数: 0
摘要
利用可再生电力进行电化学水分离是生产绿色氢气的一条极具吸引力的途径。与酸性相比,碱性条件下阴极侧的氢进化反应(HER)相对困难,因为其中存在一个速率决定步骤,即破坏水分子中的强 H-OH 键。在这里,通过脉冲激光沉积法将超细钯纳米颗粒均匀地分布在 TiO2 纳米颗粒(PdNPs/TiO2)上,从而暴露出丰富的界面位点,在 1 M KOH 中电流密度为 -10 mA cm-2 时,HER 过电位较低,仅为 71 mV。PdNPs/TiO2 上的界面 Pd-O-Ti 结构提供了活性相与水分子的直接接触,有助于断开 H-OH 键。同时,在碱性 HER 条件下,界面 Pd-O-Ti 位点实现了 H 在 Pd 上的选择性吸附和 OH 中间产物在 TiO2 上的选择性吸附,从而优化了整个催化活性。
The engineered interfacial Pd-O-Ti sites on the TiO2 nanobelts to accelerate water dissociation for the alkaline hydrogen evolution
Electrochemical water splitting derived by the renewable electricity is one attractive route to produce the green hydrogen. The hydrogen evolution reaction (HER) at the cathode side under the alkaline condition is relatively difficult compared with the acidic, because there is a rate-determining step of breaking strong H-OH bonding in the water molecular. Herein, the ultrafine Pd nanoparticles are uniformly distributed on the TiO2 nanobelts (PdNPs/TiO2) by the pulsed laser deposition to expose the abundant interfacial sites, showing a lower HER overpotential of 71 mV at the current density of -10 mA cm-2 in 1 M KOH. The interfacial Pd-O-Ti structure on PdNPs/TiO2 provides the direct contact between active phase and the water molecules, contributing to break H-OH bond. At the same time, a selective adsorption of H on Pd and OH intermediate on TiO2 is achieved in the interfacial Pd-O-Ti sites under the alkaline HER, optimizing the whole catalytic dynamic.
期刊介绍:
Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.