Cactus-like NC/CoxP electrode enables efficient and stable hydrogen evolution for saline water splitting

IF 5.7 3区 材料科学 Q2 Materials Science
Xu Chen, Jin-yu Zhao, Wen-sheng Zhang, Xiao-min Wang
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Abstract

Designing efficient and robust catalysts for hydrogen evolution reaction (HER) is imperative for saline water electrolysis technology. A catalyst composed of CoxP nanowires array with N-doped carbon nanosheets (NC) was fabricated on Ni foam (NF) by an in-situ growth strategy. The material is designated as NC/CoxP@NF. In the preparation process, Co(OH)2 nanowires were transformed into a metal organic framework of cobalt (ZIF-67) on NF by the dissolution-coordination of endogenous Co2+ and 2-methylimidazole. The resulting cactus-like microstructure gives NC/CoxP@NF abundant exposed active sites and ion transport channels, which improve the HER catalytic reaction kinetics. Furthermore, the interconnected alternating nanowires and free-standing nanosheets in NC/CoxP@NF improve its structural stability, and the formation of surface polyanions (phosphate) and a NC nanosheet protective layer improve the anti-corrosive properties of catalysts. Thus, the NC/CoxP@NF has an excellent performance, requiring overpotentials of 107 and 133 mV for HER to achieve 10 mA cm−2 in 1.0 mol L−1 KOH and 1.0 mol L−1 KOH + 0.5 mol L−1 NaCl, respectively. This in-situ transformation strategy is a new way of constructing highly-efficient HER catalysts for saline water electrolysis.

仙人掌状 NC/CoxP 电极可在盐水分离过程中实现高效稳定的氢进化
设计高效、坚固的氢进化反应催化剂是盐水电解技术的当务之急。通过原位生长策略,在泡沫镍(NF)上制备了一种由 CoxP 纳米线阵列和掺杂 N 的碳纳米片(NC)组成的催化剂。该材料被命名为 NC/CoxP@NF。在制备过程中,Co(OH)2 纳米线通过内源 Co2+ 和 2-甲基咪唑的溶解配位转化为 NF 上的钴金属有机框架(ZIF-67)。由此形成的仙人掌状微结构赋予 NC/CoxP@NF 丰富的暴露活性位点和离子传输通道,从而改善了 HER 催化反应动力学。此外,NC/CoxP@NF 中相互连接的交替纳米线和独立的纳米片提高了其结构稳定性,表面多阳离子(磷酸盐)和 NC 纳米片保护层的形成提高了催化剂的抗腐蚀性能。因此,NC/CoxP@NF 具有优异的性能,在 1.0 mol L-1 KOH 和 1.0 mol L-1 KOH + 0.5 mol L-1 NaCl 条件下,HER 达到 10 mA cm-2 所需的过电位分别为 107 和 133 mV。这种原位转化策略是为盐水电解构建高效 HER 催化剂的一种新方法。
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来源期刊
New Carbon Materials
New Carbon Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
6.10
自引率
8.80%
发文量
3245
审稿时长
5.5 months
期刊介绍: New Carbon Materials is a scholarly journal that publishes original research papers focusing on the physics, chemistry, and technology of organic substances that serve as precursors for creating carbonaceous solids with aromatic or tetrahedral bonding. The scope of materials covered by the journal extends from diamond and graphite to a variety of forms including chars, semicokes, mesophase substances, carbons, carbon fibers, carbynes, fullerenes, and carbon nanotubes. The journal's objective is to showcase the latest research findings and advancements in the areas of formation, structure, properties, behaviors, and technological applications of carbon materials. Additionally, the journal includes papers on the secondary production of new carbon and composite materials, such as carbon-carbon composites, derived from the aforementioned carbons. Research papers on organic substances will be considered for publication only if they have a direct relevance to the resulting carbon materials.
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