Jiaxi Zhang, Yuanhua Tu, Longhai Zhang, Shunyi He, Chengzhi Zhong, Jun Ke, Liming Wang, Ce Cui, Huiyu Song, Li Du, Zhiming Cui
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引用次数: 0
Abstract
Developing conductive electrocatalysts is crucial for decreasing the ohmic loss induced by electric resistance of the catalyst layer in the large-current-density hydrogen evolution reaction (HER), which has been overlooked previously. In this study, we screen a highly conductive antiperovskite CdNNi3 with negligible ohmic loss, as a highly active and durable HER electrocatalyst capable of unlocking ampere-scale current densities. CdNNi3 exhibits an impressive activity (an overpotential of 235 mV) at 1 A cm-2 and maintains its performance steadily at an ampere-scale current density (at 1 A cm-2 over 400 h). Besides, the CdNNi3-enabled anion-exchange membrane water electrolyzer outperforms that of the benchmark Pt/C, evidenced by a reduced cell voltage of 160 mV at 1 A cm-2, and presents a favorable stability at 1 A cm-2. Importantly, this study experimentally discovers the dynamic surface reconstruction phenomena of antiperovskite nitrides during alkaline HER. Theoretical analysis suggests that the presence of Cd in the reconstructed surface effectively adjusts the local electronic configuration of active sites, which promotes the adsorption of OH and reduces the binding strength to H, thereby facilitating the water dissociation step and reducing the energy barrier of the potential-determining step in the HER process.
开发导电电催化剂对于降低大电流密度氢气进化(HER)反应中催化剂层电阻引起的欧姆损耗至关重要,而这一点之前一直被忽视。在本研究中,我们筛选出了一种可忽略欧姆损耗的高导电性反钝角石 CdNNi3,将其作为一种高活性、高持久性的 HER 电催化剂,能够释放出安培级的电流密度。CdNNi3 在 1 A cm-2 时表现出惊人的活性(过电位为 235 mV),并在安培级电流密度下(1 A cm-2 时超过 400 小时)保持稳定的性能。此外,CdNNi3 阴离子交换膜水电解槽的性能优于基准的 Pt/C 电解槽,在 1 A cm-2 时电池电压降低了 160 mV,并在 1 A cm-2 时表现出良好的稳定性。重要的是,这项研究通过实验发现了反沸石氮化物在碱性 HER 过程中的动态表面重构现象。理论分析表明,重构表面中镉的存在有效地调整了活性位点的局部电子构型,促进了 OH 的吸附,降低了与 H 的结合强度,从而促进了水的解离步骤,降低了 HER 过程中电位决定步骤的能量势垒。
期刊介绍:
ACS Nano, published monthly, serves as an international forum for comprehensive articles on nanoscience and nanotechnology research at the intersections of chemistry, biology, materials science, physics, and engineering. The journal fosters communication among scientists in these communities, facilitating collaboration, new research opportunities, and advancements through discoveries. ACS Nano covers synthesis, assembly, characterization, theory, and simulation of nanostructures, nanobiotechnology, nanofabrication, methods and tools for nanoscience and nanotechnology, and self- and directed-assembly. Alongside original research articles, it offers thorough reviews, perspectives on cutting-edge research, and discussions envisioning the future of nanoscience and nanotechnology.