Abstract

Inorganic nitride nanomaterials have attracted widespread attention for applications in renewable energy due to novel electrochemical activities and high chemical stabilities. For different renewable energy applications, there are many possibilities and uncertainties about the optimal nitride phases and nanostructures, which further promotes the exploration of controllable preparation of nitride nanomaterials. Moreover, unlike conventional nitrides with bulk or ceramic structures, the synthesis of nitride nanomaterials needs more accurate control to guarantee the target nanostructure along with the phase purity, which make the whole synthesis still a challenge to achieve. In this mini review, we mainly summarize the synthesis methods for inorganic nitride nanomaterials, including chemistry vapor deposition, self-propagation high-temperature synthesis, solid state metathesis reactions, solvothermal synthesis, etc. From the perspective of nanostructure, several novel nitrides, with nanostructures like nanoporous, two-dimensional, defects, ternary structures, and quantum dots, are showing unique properties and getting extensive attentions, recently. Prospects of future research in design and synthesis of functional inorganic nitrides are also discussed.

Highlights

  • Increasing demands for renewable energy have stimulated the ever-growing developments in the generation of novel energy storage and conversion technologies (Chu et al, 2016; Chen et al, 2020; Vakulchuk et al, 2020)

  • We summarized the mostly used synthesis methods of inorganic nitride bulk-materials or nanomaterials and their corresponding development trends

  • The design and fabrication of high-quality nitride nanomaterials is the initial and key steps to realize their applications for renewable energy

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Summary

INTRODUCTION

Increasing demands for renewable energy have stimulated the ever-growing developments in the generation of novel energy storage and conversion technologies (Chu et al, 2016; Chen et al, 2020; Vakulchuk et al, 2020). Unique electronic characteristics and strong metalnitrogen bonds make the nitride anion (N3−) difficult to be substituted, further leading to transition metal nitride nanomaterials show properties like hardness, mechanical stiffness, and high chemical stability. For non-metal nitride nanomaterials (including BN, C3N4 and CxN), typical N configurations (like quaternary N, pyridinic N and pyrrolic N) are formed within the boron or carbon skeleton, of which quaternary N and pyridinic N could show activities for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in water splitting, or oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs) (Liu et al, 2015; Niu and Yang, 2018). Inorganic nitride nanomaterials show various possibilities for renewable energy applications. For the synthesis of nitride nanomaterials, it is a much more difficult challenge to realize the multi-parameter control of its structure, morphology, size, doping, and defects. We conclude with the challenges and chances of precise functionalized inorganic nitrides

SYNTHESIS METHODS FOR NITRIDES
CONCLUSIONS AND OUTLOOK
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