# Measurement of Low-Concentration Hydrogen in Inert Gas Within a Small Closed Volume

## TL;DR

A new method using a MOSFEC sensor measures hydrogen concentration in a closed system during metal hydride decomposition.

## Contribution

A cost-effective, real-time hydrogen measurement technique for closed systems using a MOSFEC sensor.

## Key findings

- The MOSFEC sensor works effectively under harsh conditions like inert gases and temperature changes.
- The method enables precise measurement of hydrogen release dynamics in small closed volumes.
- The technique allows determination of specific gas release temperatures from metal hydrides.

## Abstract

A technique has been proposed and experimentally tested for measuring the hydrogen concentration in an inert atmosphere within a closed system. This method utilizes a metal-oxide-semiconductor field-effect capacity-type (MOSFEC) sensor under harsh conditions such as exposure to inert gases, pressure fluctuations, and varying temperatures. The measurement is performed during the thermal decomposition of metal hydrides in a liquid sodium environment. The developed measurement technique for determining hydrogen concentration released from metal hydride samples in a system with a closed gas path is cost-effective compared to standardized, resource-intensive open-volume flow measurement methods. The use of the developed MOSFEC sensor technique allows for rapid and efficient investigation of the in situ real-time dynamics of gas release from various metal hydride materials differing in their hydrogen content within a small closed volume. Additionally, this approach enables precise determination of the specific gas release temperatures.