# US 2022/0045331 A1 · Black metallic nanorod arrays and method of manufacturing thereof

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- Number: US 2022/0045331 A1
- Document ID: US20220045331A1
- Status: Published application
- Kind: A1
- Application number: 17/396,031
- Filed: 2021-08-06
- Published: 2022-02-10
- Earliest claimed: 2020-08-07
- Assignees: Wayne State University
- Applicants: Wayne State University
- Inventors: Da Deng; Minjun Bae
- Web page: https://patentgrep.com/patent/US20220045331A1

## CPC

- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/628: {Inhibitors, e.g. gassing inhibitors, corrosion inhibitors}
- A61L 27/06: Titanium or titanium alloys
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/1395: of electrodes based on metals, Si or alloys
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 4/667: {in the form of layers, e.g. coatings}
- H01M 4/70: characterised by shape or form
- H01M 10/052: Li-accumulators
- B82Y 40/00: Manufacture or treatment of nanostructures
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/025: {with shapes other than plane or cylindrical}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A device may include a metallic substrate and a plurality of nanorod arrays arranged on the substrate. The nanorod arrays may be made of porous metallic nanostructures and may appear black in color.

## Claims

### Claim 1

A device comprising:
a metallic substrate;
a plurality of nanorod arrays arranged on the substrate;
wherein the nanorod arrays porous metallic nanostructures and appear black in color.

### Claim 2 (depends on 1)

The device of claim 1, wherein the metallic substrate is foil.

### Claim 3 (depends on 1)

The device of claim 1, wherein the metal is titanium.

### Claim 4 (depends on 1)

The device of claim 1, wherein the metal is selected from a group comprising copper, iron, lead, nickel, tin vanadium, zinc, aluminum, silicon, and alloys thereof.

### Claim 5 (depends on 1)

The device of claim 1, wherein the device is a lithium-ion or lithium-metal battery, and the metallic substrate is a current collector.

### Claim 6

A method for forming black metallic nanorod arrays, comprising:
forming metal oxide nanorod arrays on a metallic substrate;
spreading Mg on the metal oxide nanorod arrays;
heating the metal oxide nanorod arrays with Mg, resulting in metallic nanorod arrays;
removing excess Mg and MgO from the metallic nanorod arrays; and
drying the metallic nanorod arrays.

### Claim 7 (depends on 6)

The method of claim 6, wherein the metal oxide is TiO2.

### Claim 8 (depends on 6)

The method of claim 6, wherein the metallic substrate is a metal foil.

### Claim 9 (depends on 6)

The method of claim 6, wherein forming the metal oxide nanorod arrays includes:
hydrothermally treating a piece of the metal substrate;
treating the metal substrate with an acid; and
heating the metal substrate.

### Claim 10 (depends on 9)

The method of claim 9, wherein the acid is HCl.

### Claim 11 (depends on 9)

The method of claim 9, further comprising placing two pieces of the metal substrate with nanorod arrays in a crucible before spreading the Mg thereon.

### Claim 12 (depends on 11)

The method of claim 11, wherein heating the metal oxide nanorod arrays with Mg is done in a crucible under argon.

### Claim 13 (depends on 6)

The method of claim 6, wherein removing excess Mg and MgO is done by treating the metallic nanorod arrays with HCl.

### Claim 14 (depends on 6)

The method of claim 6, wherein drying the metallic nanorod arrays is done in a vacuum oven.

### Claim 15

A device made from a process comprising:
forming metal oxide nanorod arrays on a metallic substrate;
spreading Mg on the metal oxide nanorod arrays;
heating the metal oxide nanorod arrays with Mg, resulting in metallic nanorod arrays;
removing excess Mg and MgO from the metallic nanorod arrays; and
drying the metallic nanorod arrays;
wherein the nanorod arrays are porous and appear black in color.

### Claim 16 (depends on 15)

The device of claim 15, wherein the metal oxide is TiO2 and the metallic substrate is a Ti foil.

### Claim 17 (depends on 15)

The device of claim 15, wherein forming the metal oxide nanorod arrays includes:
hydrothermally treating a piece of the metal substrate;
treating the metal substrate with an acid; and
heating the metal substrate.

### Claim 18 (depends on 15)

The device of claim 15, wherein the process further comprises placing two pieces of the metal substrate with nanorod arrays in a crucible before spreading the Mg thereon.

### Claim 19 (depends on 18)

The device of claim 18, wherein heating the metal oxide nanorod arrays with Mg is done in a crucible under argon.

### Claim 20 (depends on 15)

The device of claim 15, wherein removing excess Mg and MgO is done by treating the metallic nanorod arrays with HCl.