清华大学王训团队报道了自适应Zn-NiOOH亚纳米线活化和稳定晶格氧的析氧反应。相关研究成果发表在2024年10月9日出版的《美国化学会杂志》。

高效耐用的析氧反应催化剂对于实现水电解技术的大规模应用至关重要。

该文中，研究人员报告了一种新型的通过电化学重建Zn-NiMoO₄ SNWs合成的掺锌NiOOH亚纳米线（Zn-NiOOH SNWs）催化剂。由于Zn对配位类型的适应性调节，Zn的加入引发了NiOOH析氧反应机制从吸附态析氧机制向晶格氧机制的转变，这同时提高了反应能量，从而增强了稳定性和活性。

此外，亚纳米线结构进一步稳定了Zn-NiOOH中的晶格氧，防止其破坏性溶解。值得注意的是，Zn-NiOOH SNWs的电流密度为10 mA cm^-2，过电位仅为179 mV，并在200 mA cm^-2下稳定运行800小时，过电位变化最小，使其成为碱性析氧反应中涉及晶格氧的最有效催化剂之一。当用作碱性水电解槽中的阳极时，该Zn-NiOOH SNWs催化剂在200mA cm^-2的水分解电流下表现出超过500小时的稳定性，表明其具有广阔的实际应用潜力。

附：英文原文

Title: Activating and Stabilizing Lattice Oxygen via Self-Adaptive Zn–NiOOH Sub-Nanowires for Oxygen Evolution Reaction

Author: Yuan Huang, Zeyu Wang, Hai Xiao, Qingda Liu, Xun Wang

Issue&Volume: October 9, 2024

Abstract: Efficient and durable catalysts for the oxygen evolution reaction are essential for realizing the large-scale application of water electrolysis technologies. Here, we report a novel Zn-doped NiOOH subnanowires (Zn–NiOOH SNWs) catalyst synthesized via the electrochemical reconstruction of Zn–NiMoO4 SNWs. The inclusion of Zn triggers a transition in the oxygen evolution reaction mechanism of NiOOH from the adsorbate evolution mechanism to the lattice oxygen mechanism, resulted from Zn’s adaptive adjustment of coordination types, which also improves the reaction energetics, thereby enhancing the stability and activity. Furthermore, the subnanowire structure provides further stabilization of the lattice oxygen in Zn–NiOOH, preventing its destructive dissolution. Remarkably, Zn–NiOOH SNWs display a current density of 10 mA cm–2 with an overpotential of only 179 mV and maintain stable operation at 200 mA cm–2 for 800 h with minimal changes in overpotential, establishing them as one of the most effective catalysts involving lattice oxygen for the alkaline oxygen evolution reaction. When utilized as the anode in an alkaline water electrolyzer, our Zn–NiOOH SNWs catalyst demonstrates stability exceeding 500 h under a water-splitting current of 200 mA cm–2, indicating promising potential for practical applications.

DOI: 10.1021/jacs.4c09931

Source: https://pubs.acs.org/doi/abs/10.1021/jacs.4c09931