Bimetallic site substitution of NiCoP nanoneedles as bifunctional electrocatalyst for boosted water splitting

IF 9.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Nano Research Pub Date : 2024-08-31 DOI:10.1007/s12274-024-6952-3

Ya Gao, Yuhui Qiao, Xuanrong Li, Chengyu Huang, Jing Zhang, Yirong Wang, Xingli Zou, Zhonghong Xia, Xinxin Yang, Xionggang Lu, Yufeng Zhao

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Abstract

The bimetallic nickel-cobalt phosphide (NiCoP) has been confirmed as an efficient electrocatalyst in water splitting. But little attention is paid to the selectivity and affinity of metal sites on hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Herein, we report a trace-Zn-doping (2.18 wt.%) NiCoP (Zn-NiCoP) whereby the nanoparticles self-aggregated to form elongated nanoneedles. We discover that both Co and Ni sites can be replaced by Zn. The Co substitution improves HER, while the Ni substitution dramatically reduces the energy barrier of the rate-determining step (*O → *OOH). The negative shift of d-band centers after Zn doping ameliorates the intermediate desorption. Therefore, Zn-NiCoP demonstrates superior electrocatalytic activity with overpotentials of 48 and 240 mV for HER and OER at 10 and 50 mA·cm⁻², respectively. The cell voltage with Zn-NiCoP as both anode and cathode in water splitting was as low as 1.35 V at 10 mA·cm⁻².

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纳米镍钴针的双金属位点置换作为促进水分离的双功能电催化剂

双金属磷化镍钴（NiCoP）已被证实是一种高效的水分离电催化剂。但人们很少关注金属位点在氢进化反应（HER）和氧进化反应（OER）中的选择性和亲和性。在此，我们报告了一种痕量锌掺杂（2.18 wt.%）的镍钴锰酸锂（Zn-NiCoP），其纳米颗粒自聚集形成细长的纳米针状。我们发现，钴和镍的位点都可以被锌取代。钴的取代提高了 HER，而镍的取代则大大降低了决定速率步骤（*O → *OOH）的能垒。掺杂 Zn 后 d 带中心的负移改善了中间解吸。因此，Zn-NiCoP 显示出卓越的电催化活性，在 10 mA-cm-2 和 50 mA-cm-2 条件下，HER 和 OER 的过电位分别为 48 和 240 mV。在 10 mA-cm-2 条件下，以 Zn-NiCoP 同时作为阳极和阴极进行水分离的电池电压低至 1.35 V。

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来源期刊

Nano Research 化学-材料科学：综合

CiteScore

14.30

自引率

11.10%

发文量

2574

审稿时长

1.7 months

期刊介绍： Nano Research is a peer-reviewed, international and interdisciplinary research journal that focuses on all aspects of nanoscience and nanotechnology. It solicits submissions in various topical areas, from basic aspects of nanoscale materials to practical applications. The journal publishes articles on synthesis, characterization, and manipulation of nanomaterials; nanoscale physics, electrical transport, and quantum physics; scanning probe microscopy and spectroscopy; nanofluidics; nanosensors; nanoelectronics and molecular electronics; nano-optics, nano-optoelectronics, and nano-photonics; nanomagnetics; nanobiotechnology and nanomedicine; and nanoscale modeling and simulations. Nano Research offers readers a combination of authoritative and comprehensive Reviews, original cutting-edge research in Communication and Full Paper formats. The journal also prioritizes rapid review to ensure prompt publication.