一个由柏林工业大学Shuang Li和四川大学Changsheng Zhao等组成的团队在电化学材料研究中取得进展。他们通过界面原子替代工程获得了高价铁过渡金属氢氧化物纳米纤维，并用其实现了高效电化学水氧化。这一研究成果于2021年12月22日发表在国际顶尖学术期刊《德国应用化学》上。

研究组报道了一种界面原子取代策略，以合成一种电催化析氧的NiFeV纳米纤维，来提高NiFe中心的活性。电子结构分析表明，NiFeV纳米纤维通过Fe向V的电荷转移表现出丰富的高价位Fe。碳布负载的NiFeV纳米纤维过电位在10 mA cm^-2时低至181 mV，并在100 mA cm^-2时具有长期稳定性（>20小时）。该报道中的替代生长策略为设计高效耐用的非贵金属基析氧反应催化剂提供了一条有效的新途径。

据了解，开发低成本、高效、稳定的析氧反应(OER)电催化剂——如镍铁基材料——是实现大规模水电解的关键。用其他过渡金属装饰NiFe催化剂为提高其催化活性提供了一种新的途径，但通常对NiFe催化中心电子结构的可控性较低。

附：英文原文

Title: Interfacial Atom-Substitution Engineered Transition-Metal Hydroxide Nanofibers with High-Valence Fe for Efficient Electrochemical Water Oxidation

Author: Ben Zhang, Zihe Wu, Wenjie Shao, Yun Gao, Weiwen Wang, Tian Ma, Lang Ma, Shuang Li, Chong Cheng, Changsheng Zhao

Issue&Volume: 2021-12-22

Abstract: Developing low-cost electrocatalysts for efficient and robust oxygen evolution reaction (OER) is the key for scalable water electrolysis, for instance, the NiFe-based materials. Decorating NiFe catalysts with other transition metals offers a new path to boost their catalytic activities but often suffers from low controllability on electronic structures of NiFe catalytic centers. Here, we report an interfacial atom-substitution strategy to synthesize an electrocatalytic oxygen-evolving NiFeV nanofiber to boost the activity of NiFe centers. The electronic structure analyses suggest that NiFeV nanofiber exhibits abundant high-valence Fe via a charge transfer from Fe to V. The NiFeV nanofiber supported on carbon cloth shows a low overpotential of 181 mV at 10 mA cm  2  , along with long-term stability (> 20 h) at 100 mA cm  2  . The reported substitutional growth strategy offers an effective and new pathway for the design of efficient and durable non-noble metal-based OER catalysts.

DOI: 10.1002/anie.202115331

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202115331