CHAPTER 1. INTRODUCTION TO THE METASTABLE PHASE MATERIALS<br>Introduction <br>What are the metastable phase materials<br>The categories of metastable phase materials<br>The influence on polymorphs of materials<br>The wide applications of metastable phase materials<br>The criterion for stable phase and metastable phase materials<br>References<br> <br>CHAPTER 2. SYNTHETIC METHODOLOGY<br>Introduction <br>The keys for synthesizing metastable phase materials <br>The synthetic methods for synthesizing metastable phase materials<br>References<br> <br>CHAPTER 3. CHARACTERIZATION<br>Introduction<br>Characterizations<br>How to determine the phase of metastable phase 2D metal oxides<br>References<br> <br>CHAPTER 4. METASTABLE PHASE METALS<br>Introduction<br>Noble metals<br>Non-noble metals<br>The criterion to determine the stable phase and metastable phase metals<br>References<br> <br>CHAPTER 5. METASTABLE PHASE OXIDE, CHALCOGENIDE, PHOSPHIDE AND BORIDE MATERIALS<br>Introduction<br>Oxides<br>Others<br>References<br> <br>CHAPTER 6. SPIN-DEPENDENT METASTABLE PHASE MATERIALS<br>Introduction<br>Spin related catalysis<br>Spin related catalysts for alkaline OER<br>Spin related catalyst for acidic OER<br>References<br> <br>CHAPTER 7. CRYSTALLOGRAPHY, DESIGN AND SYNTHESIS OF TWO-DIMENSIONAL METASTABLE PHASE OXIDES<br>Introduction<br>The Point group, crystal system, crystal lattice and space groups of 2D materials<br>The possible crystal structure and chemical formula of 2D metal oxides<br>How to prepare metastable phase 2D metal oxides<br>Metastable phase 2D noble metal oxides<br>Metastable phase 2D non-noble metal oxides<br>The covalent bond behavior in metastable phase 1T metal oxides<br>References<br> <br>CHAPTER 8. ELECTROCATALYSIS<br>Introduction<br>Several typical electrochemical reactions<br>Metastable phase catalysts for advanced electrocatalysis<br>References<br> <br>CHAPTER 9. PHOTOCATALYSTS<br>Introduction <br>Fundamental concepts of photocatalysis<br>Metastable phase catalysts and photocatalysis<br>The advantages and disadvantages of photocatalysis<br>References<br> <br>CHAPTER 10. THERMOCATALYSTS<br>Introduction <br>Several typical thermocatalytic reactions <br>Metastable phase catalysts for thermocatalysis <br>References<br> <br>Summary and Outlook<br>