Hydrogen is a promising sustainable energy carrier for the future due to its high energetic content and no emissions, other than water vapor. However, its full deployment still requires technological advances in the renewable and cost-effective production of hydrogen, cost reduction of fuel cells and especially in the storage of hydrogen in a lightweight, compact and safe manner. One way to achieve this is by using materials in which hydrogen bonds chemically, or by adsorption. Different kinds of Hydrogen Storage Materials have been investigated, such as Metal-Organic Frameworks (MOFs), Simple Hydrides (including Magnesium Hydride, MgH₂), AB₅Alloys, AB₂ Alloys, Carbon Nanotubes, Graphene, Borohydrides, Alanates and Ammonia Borane. Billions have been invested in Storage Materials research, resulting in tens of thousands of papers. Thus, it is challenging to track how much effort has been devoted to each materials class, by which countries, and how the field has evolved over the years. Quantitative Science and Technology Indicators, produced by applying Bibliometrics and Text Mining to scientific papers, can aid in achieving this task. In this work, we evaluated the evolution and distribution of Hydrogen Storage Materials research using this methodology. Papers in the 2000–2015 period were collected from Web of Science and processed in VantagePoint^®bibliometric software. A thesaurus was elaborated relating keywords and short phrases to specific Hydrogen Storage Materials classes. The number of publications in Hydrogen Storage Materials grew markedly from 2003 to 2010, reducing the pace of growth afterwards until a plateau was reached in 2015. The most researched materials were MOFs, Simple Hydrides and Carbon-based materials. There were three typical trends in materials classes: emerging materials, developed after 2003, such as MOFs and Borohydrides; classical materials with continuous growth during the entire period, such as Simple Hydrides; and stagnant or declining materials, such as Carbon Nanotubes and AB₅ Alloys. The main publishing countries were China, countries from the European Union (EU) and the USA, followed by Japan. There is a division between countries with continued growth in recent years, such as China, and those with stagnant production after 2010, such as the EU, the USA and Japan. The results of this work, compared to a previous study in storage materials patenting by our group, and the recent launch of commercial hydrogen cars and trains and stationary hydrogen production and fuel cell solutions, indicates that although the Hydrogen Energy field as a whole is transitioning from lab and prototype stages to commercial deployment, materials-based hydrogen storage still has base technological challenges to be overcome, and therefore still needs more scientific research before large scale commercialization can be realized. The developed thesaurus is made available for refinement and future works.

https://doi.org/10.1016/j.ijhydene.2019.06.093

Author(s): Lucas Faccioni Chanchetti, Daniel Rodrigo Leiva, Leandro Innocentini Lopes de Faria, Tomaz Toshimi Ishikawa
Organization(s): Federal University of Sao Carlos
Source: International Journal of Hydrogen Energy
Year: 2019

The complexity and uncertainty that increasingly characterize public issues in contemporary societies indicate the relevance of public innovation, which designates a collection of approaches for exploring, testing and validating new ideas that create added value for society. Despite its relevance, studies are still needed to go further in analyzing the literature built on the subject, and to identify new research agendas that can generate inputs to translate theories into practice. Hence, the purpose of this article is to analyze the concept of public innovation and establish a future research agenda about the topic, on the basis of a systematic literature review of documents published between 2004 and 2018 in the Web of Science® multi-disciplinary database. For this purpose, the data mining software Vantage Point® and the qualitative analysis software MAXQDA® were used to study 148 documents. The results show the need to deepen the construction of public innovation theory from the perspective of the actors who interact in its dynamics. Finally, from the methodological perspective, it was found relevant to study the topic using a triangulation of methods, and through developing longitudinal and comparative studies, in order to understand the conditioning factors and results of the network collaboration exercises implicit in public innovation processes.

https://link.springer.com/chapter/10.1007/978-3-030-21451-7_14

Author(s): Lizeth Fernanda Serrano Cárdenas, Yessika Lorena Vásquez González, Flor Nancy Díaz-Piraquive, Javier Eloy Guillot Landecker
Organization(s): Universidad Jorge Tadeo Lozano, Universidad Católica de Colombia
Source: Knowledge Management in Organizations. KMO 2019. Communications in Computer and Information Science, vol 1027. Springer, Cham
Year: 2019