Dhanaji B. Malavekar, Shivam Kansara, Mayur A. Gaikwad, Komal D. Patil, Suyoung Jang, Sang Woo Park, Hyojung Bae, Jang-Yeon Hwang, Jin Hyeok Kim
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Benefiting from the excellent mass transport due to mesoporosity, NiO/NiWO<sub>4</sub>-rGO required an overpotential of 270 mV to achieve a current density of 50 mA cm<sup>−2</sup> for OER and 54 mV to achieve a current density of -10 mA cm<sup>−2</sup> for HER. A Tafel slope of 82 and 58 mV dec<sup>−1</sup> for OER and HER was observed for NiO/NiWO<sub>4</sub>-rGO, respectively. Overall water splitting devices fabricated using NiO/NiWO<sub>4</sub>-rGO as an anode and cathode require a cell voltage of 1.59 V to enable a current density of 50 mA cm<sup>−2</sup> with stability for over 50 h indicating a favorable morphological modulation at the interface of NiWO<sub>4</sub>-rGO shell structure coated on a crystalline NiO core, which lowers the overpotential requirement. The assembled water-splitting device performs water splitting 10 M KOH and requires only 1.55 V to reach the current density of 50 mA cm<sup>−2</sup>. Our density functional theory (DFT) calculations reveal the free energy profiles of hydrogen adsorption, guiding the experimental optimization of catalysts for efficient HER and OER. Furthermore, a seawater electrocatalysis device assembled using NiO/NiWO<sub>4</sub>-rGO required only 1.77 V to reach 50 mA cm<sup>−2</sup> current density with stability over 50 h. This confirms that NiO/NiWO<sub>4</sub>-rGO is a potential material for industrial and practical water splitting.</p></div>","PeriodicalId":7220,"journal":{"name":"Advanced Composites and Hybrid Materials","volume":"7 6","pages":""},"PeriodicalIF":23.2000,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Composite shell empowered crystalline-amorphous NiO/NiWO4-rGO core-shell electrocatalyst for efficient water electrocatalysis\",\"authors\":\"Dhanaji B. Malavekar, Shivam Kansara, Mayur A. 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引用次数: 0
摘要
镍基材料具有出色的电化学水分离活性,但其质量传输性能较差,限制了催化性能的进一步提高。在此,我们报告了一种复合核壳材料,该材料由球形纳米颗粒 NiWO4 和涂覆在结晶 NiO 上的 rGO 片组成,可用于碱性介质中的整体水分离。球形纳米颗粒与 rGO 片材的均匀涂层所形成的大孔具有高孔隙率和短扩散通道,有利于电解质的快速流动,从而提高了质量传输能力。得益于介孔性带来的出色质量传输能力,NiO/NiWO4-rGO 在 OER 中需要 270 mV 的过电位才能达到 50 mA cm-2 的电流密度,在 HER 中需要 54 mV 的过电位才能达到 -10 mA cm-2 的电流密度。在 NiO/NiWO4-rGO 中,OER 和 HER 的塔菲尔斜率分别为 82 和 58 mV dec-1。使用 NiO/NiWO4-rGO 作为阳极和阴极制造的整体分水装置需要 1.59 V 的电池电压才能使电流密度达到 50 mA cm-2,并能稳定运行 50 小时以上,这表明在结晶 NiO 内核上涂覆的 NiWO4-rGO 外壳结构的界面上存在有利的形态调制,从而降低了过电位要求。组装好的分水装置能进行 10 M KOH 的分水,只需要 1.55 V 就能达到 50 mA cm-2 的电流密度。我们的密度泛函理论(DFT)计算揭示了氢吸附的自由能曲线,为高效 HER 和 OER 催化剂的实验优化提供了指导。此外,使用 NiO/NiWO4-rGO 组装的海水电催化装置仅需 1.77 V 即可达到 50 mA cm-2 的电流密度,且稳定性超过 50 h。
Composite shell empowered crystalline-amorphous NiO/NiWO4-rGO core-shell electrocatalyst for efficient water electrocatalysis
Nickel-based materials exhibit excellent electrochemical water splitting activity; however, their inferior mass transport limits further improvement in catalytic performance. Herein, we report a composite core–shell material consisting of spherical nanoparticles of NiWO4 and rGO sheets coated on crystalline NiO for overall water splitting in an alkaline medium. The macropores created from a uniform coating of spherical nanoparticles with rGO sheets impart high porosity and short diffusion passages, facilitating fast electrolyte flow and thereby enhancing mass transport capability. Benefiting from the excellent mass transport due to mesoporosity, NiO/NiWO4-rGO required an overpotential of 270 mV to achieve a current density of 50 mA cm−2 for OER and 54 mV to achieve a current density of -10 mA cm−2 for HER. A Tafel slope of 82 and 58 mV dec−1 for OER and HER was observed for NiO/NiWO4-rGO, respectively. Overall water splitting devices fabricated using NiO/NiWO4-rGO as an anode and cathode require a cell voltage of 1.59 V to enable a current density of 50 mA cm−2 with stability for over 50 h indicating a favorable morphological modulation at the interface of NiWO4-rGO shell structure coated on a crystalline NiO core, which lowers the overpotential requirement. The assembled water-splitting device performs water splitting 10 M KOH and requires only 1.55 V to reach the current density of 50 mA cm−2. Our density functional theory (DFT) calculations reveal the free energy profiles of hydrogen adsorption, guiding the experimental optimization of catalysts for efficient HER and OER. Furthermore, a seawater electrocatalysis device assembled using NiO/NiWO4-rGO required only 1.77 V to reach 50 mA cm−2 current density with stability over 50 h. This confirms that NiO/NiWO4-rGO is a potential material for industrial and practical water splitting.
期刊介绍:
Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field.
The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest.
Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials.
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